tests

.github/workflows/copilot-setup-steps.yml

@@ -1,36 +0,0 @@
-name: "Copilot Setup Steps"
-
-# Automatically run the setup steps when they are changed to allow for easy validation, and
-# allow manual testing through the repository's "Actions" tab
-on:
-  workflow_dispatch:
-  push:
-    paths:
-      - .github/workflows/copilot-setup-steps.yml
-  pull_request:
-    paths:
-      - .github/workflows/copilot-setup-steps.yml
-
-jobs:
-  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
-  copilot-setup-steps:
-    runs-on: ubuntu-latest
-
-    # Set the permissions to the lowest permissions possible needed for your steps.
-    # Copilot will be given its own token for its operations.
-    permissions:
-      # If you want to clone the repository as part of your setup steps, for example to install dependencies, you'll need the `contents: read` permission. If you don't clone the repository in your setup steps, Copilot will do this for you automatically after the steps complete.
-      contents: read
-
-    # You can define any steps you want, and they will run before the agent starts.
-    # If you do not check out your code, Copilot will do this for you.
-    steps:
-      - name: Install .NET 10.x
-        uses: actions/setup-dotnet@v5
-        with:
-          dotnet-version: |
-            10.x
-          dotnet-quality: preview
-
-      - name: dotnet --info
-        run: dotnet --info

CHANGELOG.md

@@ -1,3 +1,14 @@
+# 2.15.0 (15 August 2026)
+- [#1495](https://github.com/wiremock/WireMock.Net/pull/1495) - Fix #1494: `WithClientIP(MatchOperator, params IStringMatcher[])` ignores the MatchOperator argument [bug] contributed by [Bafyn](https://github.com/Bafyn)
+- [#1497](https://github.com/wiremock/WireMock.Net/pull/1497) - Fix WithParam RejectOnMatch inverting the match result #1496 [bug] contributed by [Bafyn](https://github.com/Bafyn)
+- [#1499](https://github.com/wiremock/WireMock.Net/pull/1499) - Update Testcontainers [bug] contributed by [StefH](https://github.com/StefH)
+- [#1494](https://github.com/wiremock/WireMock.Net/issues/1494) - `WithClientIP(MatchOperator, params IStringMatcher[])` ignores the `MatchOperator` argument [bug]
+- [#1496](https://github.com/wiremock/WireMock.Net/issues/1496) - `WithParam(key, MatchBehaviour.RejectOnMatch, values)` inverts the match result [bug]
+
+# 2.14.0 (06 August 2026)
+- [#1493](https://github.com/wiremock/WireMock.Net/pull/1493) - Fix #1492: Serialize WithClientIP matcher to Request.ClientIP [bug] contributed by [Bafyn](https://github.com/Bafyn)
+- [#1492](https://github.com/wiremock/WireMock.Net/issues/1492) - `WithClientIP` matcher is lost / corrupted when a mapping is serialized [bug]
+
 # 2.13.0 (19 July 2026)
 - [#1488](https://github.com/wiremock/WireMock.Net/pull/1488) - feat(xunit logging): TestOutputHelperWireMockLogger [feature] contributed by [Stepami](https://github.com/Stepami)
 - [#1490](https://github.com/wiremock/WireMock.Net/pull/1490) - Fix: Fully respect configured custom admin path (merge PR #1483) [feature] contributed by [Copilot](https://github.com/apps/copilot-swe-agent)

Directory.Build.props

@@ -4,7 +4,7 @@
     </PropertyGroup>
 
     <PropertyGroup>
-        <VersionPrefix>2.13.0</VersionPrefix>
+        <VersionPrefix>2.15.0</VersionPrefix>
         <PackageIcon>WireMock.Net-Logo.png</PackageIcon>
         <PackageProjectUrl>https://github.com/wiremock/WireMock.Net</PackageProjectUrl>
         <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
@@ -52,7 +52,7 @@
 
     <ItemGroup>
         <PackageReference Include="JetBrains.Annotations" Version="2026.2.0" PrivateAssets="All" />
-        <PackageReference Include="Microsoft.SourceLink.GitHub" Version="10.0.301" PrivateAssets="All" />
+        <PackageReference Include="Microsoft.SourceLink.GitHub" Version="10.0.400" PrivateAssets="All" />
     </ItemGroup>
 
     <ItemGroup Condition=" '$(TargetFramework)' == 'net8.0' ">

Generate-ReleaseNotes.cmd

@@ -1,6 +1,6 @@
 rem https://github.com/StefH/GitHubReleaseNotes
 
-SET version=2.13.0
+SET version=2.15.0
 
 GitHubReleaseNotes --output CHANGELOG.md --skip-empty-releases --exclude-labels wontfix test question invalid doc duplicate example environment --version %version% --token %GH_TOKEN%
 

PackageReleaseNotes.txt

@@ -1,6 +1,8 @@
-# 2.13.0 (19 July 2026)
-- #1488 feat(xunit logging): TestOutputHelperWireMockLogger [feature]
-- #1490 Fix: Fully respect configured custom admin path (merge PR #1483) [feature]
-- #1482 WireMock.Minimal.Owin does not respect custom pathing for determining admin paths [bug]
+# 2.15.0 (15 August 2026)
+- #1495 Fix #1494: `WithClientIP(MatchOperator, params IStringMatcher[])` ignores the MatchOperator argument [bug]
+- #1497 Fix WithParam RejectOnMatch inverting the match result #1496 [bug]
+- #1499 Update Testcontainers [bug]
+- #1494 `WithClientIP(MatchOperator, params IStringMatcher[])` ignores the `MatchOperator` argument [bug]
+- #1496 `WithParam(key, MatchBehaviour.RejectOnMatch, values)` inverts the match result [bug]
 
 The full release notes can be found here: https://github.com/wiremock/WireMock.Net/blob/master/CHANGELOG.md

src/WireMock.Net.Abstractions/Models/IBodyData.cs

@@ -46,7 +46,7 @@ public interface IBodyData
     /// <summary>
     /// The body as Form UrlEncoded dictionary.
     /// </summary>
-    IDictionary<string, string>? BodyAsFormUrlEncoded { get; set; }
+    IDictionary<string, WireMockList<string>>? BodyAsFormUrlEncoded { get; set; }
 
     /// <summary>
     /// The detected body type (detection based on body content).

src/WireMock.Net.Abstractions/Types/WireMockList.cs

@@ -46,6 +46,98 @@ public class WireMockList<T> : List<T>
     /// <param name="values">The values to set.</param>
     public static implicit operator WireMockList<T>(T[] values) => new(values);
 
+    /// <summary>
+    /// Operator for equality comparison from WireMockList to T
+    /// </summary>
+    public static bool operator ==(WireMockList<T>? left, T? right)
+    {
+        if (ReferenceEquals(left, right))
+        {
+            return true;
+        }
+
+        if (left?.Count == 1 && Equals(left[0], right))
+        {
+            return true;
+        }
+
+        return false;
+    }
+
+    /// <summary>
+    /// Operator for equality comparison from T to WireMockList
+    /// </summary>
+    public static bool operator ==(T? left, WireMockList<T>? right)
+    {
+        if (ReferenceEquals(left, right))
+        {
+            return true;
+        }
+
+        if (right?.Count == 1 && Equals(left, right[0]))
+        {
+            return true;
+        }
+
+        return false;
+    }
+
+    /// <summary>
+    /// Operator for inequality comparison from WireMockList to T
+    /// </summary>
+    public static bool operator !=(WireMockList<T>? left, T? right) => !(left == right);
+
+    /// <summary>
+    /// Operator for inequality comparison from T to WireMockList
+    /// </summary>
+    public static bool operator !=(T? left, WireMockList<T>? right) => !(left == right);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current instance.
+    /// Two <see cref="WireMockList{T}"/> instances are equal if they contain the same elements in the same order.
+    /// </summary>
+    public override bool Equals(object? obj)
+    {
+        if (ReferenceEquals(this, obj))
+        {
+            return true;
+        }
+
+        if (obj is WireMockList<T> other)
+        {
+            if (Count != other.Count)
+            {
+                return false;
+            }
+
+            for (var i = 0; i < Count; i++)
+            {
+                if (!Equals(this[i], other[i]))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /// <summary>
+    /// Returns a hash code for this instance based on its elements.
+    /// </summary>
+    public override int GetHashCode()
+    {
+        var hashCode = 17;
+        foreach (var item in this)
+        {
+            hashCode = hashCode * 31 + (item?.GetHashCode() ?? 0);
+        }
+
+        return hashCode;
+    }
+
     /// <summary>
     /// Returns a <see cref="string" /> that represents this instance.
     /// </summary>
@@ -61,7 +153,7 @@ public class WireMockList<T> : List<T>
                 {
                     return strValue;
                 }
-               
+
                 return this[0]?.ToString() ?? string.Empty;
 
             default:

src/WireMock.Net.Minimal/Matchers/FormUrlEncodedMatcher.cs

@@ -1,10 +1,10 @@
 // Copyright © WireMock.Net
 
-using System.Linq;
 using AnyOfTypes;
 using Stef.Validation;
 using WireMock.Extensions;
 using WireMock.Models;
+using WireMock.Types;
 using WireMock.Util;
 
 namespace WireMock.Matchers;
@@ -21,7 +21,7 @@ public class FormUrlEncodedMatcher : IStringMatcher, IIgnoreCaseMatcher
     /// <inheritdoc />
     public MatchBehaviour MatchBehaviour { get; }
 
-    private readonly List<(WildcardMatcher Key, WildcardMatcher? Value)> _pairs = [];
+    private readonly List<(WildcardMatcher Key, WildcardMatcher[]? Values)> KeyValueMatchers = [];
 
     /// <summary>
     /// Initializes a new instance of the <see cref="FormUrlEncodedMatcher"/> class.
@@ -91,9 +91,10 @@ public class FormUrlEncodedMatcher : IStringMatcher, IIgnoreCaseMatcher
             {
                 foreach (var nameValue in nameValueCollection)
                 {
-                    var keyMatcher = new WildcardMatcher(MatchBehaviour.AcceptOnMatch, [nameValue.Key], ignoreCase, MatchOperator);
-                    var valueMatcher = new WildcardMatcher(MatchBehaviour.AcceptOnMatch, [nameValue.Value], ignoreCase, MatchOperator);
-                    _pairs.Add((keyMatcher, valueMatcher));
+                    var keyMatcher = new WildcardMatcher(MatchBehaviour.AcceptOnMatch, nameValue.Key, ignoreCase);
+                    var valueMatchers = nameValue.Value.Select(value => new WildcardMatcher(MatchBehaviour.AcceptOnMatch, value, ignoreCase)).ToArray();
+
+                    KeyValueMatchers.Add((keyMatcher, valueMatchers));
                 }
             }
         }
@@ -116,37 +117,51 @@ public class FormUrlEncodedMatcher : IStringMatcher, IIgnoreCaseMatcher
         var matches = GetMatches(inputNameValueCollection);
 
         var score = MatchScores.ToScore(matches, MatchOperator);
-        return MatchResult.From(Name, MatchBehaviourHelper.Convert(MatchBehaviour, score));
+        return MatchResult.From(Name, score);
     }
 
-    private bool[] GetMatches(IDictionary<string, string> inputNameValueCollection)
+    private List<double> GetMatches(IDictionary<string, WireMockList<string>> inputNameValueCollection)
     {
-        var matches = new List<bool>();
-        if (_pairs.Count > inputNameValueCollection.Count)
+        var inputPairs = inputNameValueCollection.ToArray();
+        var rowCount = inputPairs.Length;
+        var columnCount = KeyValueMatchers.Count;
+
+        if (rowCount == 0 && columnCount == 0)
         {
-            matches.AddRange(Enumerable.Repeat(false, _pairs.Count - inputNameValueCollection.Count));
+            return [];
         }
 
-        foreach (var inputKeyValuePair in inputNameValueCollection)
+        var matrix = new double[rowCount][];
+
+        for (var row = 0; row < rowCount; row++)
         {
-            var match = false;
-            foreach (var pair in _pairs)
+            matrix[row] = new double[columnCount];
+
+            var inputKeyValuePair = inputPairs[row];
+            var inputKey = inputKeyValuePair.Key;
+            var inputValues = inputKeyValuePair.Value;
+
+            for (var column = 0; column < columnCount; column++)
             {
-                var keyMatchResult = pair.Key.IsMatch(inputKeyValuePair.Key).IsPerfect();
-                if (keyMatchResult)
-                {
-                    match = pair.Value?.IsMatch(inputKeyValuePair.Value).IsPerfect() ?? false;
-                    if (match)
-                    {
-                        break;
-                    }
-                }
-            }
+                var (keyMatcher, valuesMatchers) = KeyValueMatchers[column];
 
-            matches.Add(match);
+                var keyScore = keyMatcher.IsMatch(inputKey).Score;
+                var valueScore = valuesMatchers != null ? MatchScores.ToScore(inputValues, valuesMatchers) : MatchScores.Perfect;
+
+                matrix[row][column] = Math.Min(keyScore, valueScore);
+            }
         }
 
-        return matches.ToArray();
+        var rowScores = rowCount == 0 ? [] : matrix.Select(row => row.Length == 0 ? MatchScores.Mismatch : row.Max()).ToList();
+
+        var columnScores = new List<double>();
+        for (var column = 0; column < columnCount; column++)
+        {
+            columnScores.Add(rowCount == 0 ? MatchScores.Mismatch : matrix.Max(row => row[column]));
+        }
+
+        rowScores.AddRange(columnScores);
+        return rowScores;
     }
 
     /// <inheritdoc />

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageBodyMatcher.cs

@@ -2,6 +2,7 @@
 
 using Stef.Validation;
 using WireMock.Matchers.Helpers;
+using WireMock.Types;
 using WireMock.Util;
 
 namespace WireMock.Matchers.Request;
@@ -34,7 +35,7 @@ public class RequestMessageBodyMatcher : IRequestMatcher
     /// <summary>
     /// The body data function for FormUrlEncoded
     /// </summary>
-    public Func<IDictionary<string, string>?, bool>? MatchOnBodyAsFormUrlEncodedFunc { get; }
+    public Func<IDictionary<string, WireMockList<string>>?, bool>? MatchOnBodyAsFormUrlEncodedFunc { get; }
 
     /// <summary>
     /// The matchers.
@@ -116,7 +117,7 @@ public class RequestMessageBodyMatcher : IRequestMatcher
     /// Initializes a new instance of the <see cref="RequestMessageBodyMatcher"/> class.
     /// </summary>
     /// <param name="func">The function.</param>
-    public RequestMessageBodyMatcher(Func<IDictionary<string, string>?, bool> func)
+    public RequestMessageBodyMatcher(Func<IDictionary<string, WireMockList<string>>?, bool> func)
     {
         MatchOnBodyAsFormUrlEncodedFunc = Guard.NotNull(func);
     }

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageParamMatcher.cs

@@ -1,6 +1,5 @@
 // Copyright © WireMock.Net
 
-using System.Linq;
 using Stef.Validation;
 using WireMock.Types;
 
@@ -54,7 +53,10 @@ public class RequestMessageParamMatcher : IRequestMatcher
     /// <param name="ignoreCase">Defines if the key should be matched using case-ignore.</param>
     /// <param name="values">The values.</param>
     public RequestMessageParamMatcher(MatchBehaviour matchBehaviour, string key, bool ignoreCase, params string[]? values) :
-        this(matchBehaviour, key, ignoreCase, values?.Select(value => new ExactMatcher(matchBehaviour, ignoreCase, MatchOperator.And, value)).Cast<IStringMatcher>().ToArray())
+        // Note: the inner ExactMatcher must use AcceptOnMatch.
+        // The MatchBehaviour (e.g. RejectOnMatch) is applied once by this matcher's GetMatchingScore.
+        // Passing matchBehaviour here as well would apply the conversion twice and invert RejectOnMatch.
+        this(matchBehaviour, key, ignoreCase, values?.Select(value => new ExactMatcher(MatchBehaviour.AcceptOnMatch, ignoreCase, MatchOperator.And, value)).Cast<IStringMatcher>().ToArray())
     {
     }
 
@@ -113,36 +115,6 @@ public class RequestMessageParamMatcher : IRequestMatcher
         }
 
         // Return the score based on Matchers and valuesPresentInRequestMessage
-        return CalculateScore(Matchers, valuesPresentInRequestMessage);
-    }
-
-    private static double CalculateScore(IReadOnlyList<IStringMatcher> matchers, WireMockList<string> valuesPresentInRequestMessage)
-    {
-        var total = new List<double>();
-
-        // If the total patterns in all matchers > values in message, use the matcher as base
-        if (matchers.Sum(m => m.GetPatterns().Length) > valuesPresentInRequestMessage.Count)
-        {
-            foreach (var matcher in matchers)
-            {
-                double score = 0d;
-                foreach (string valuePresentInRequestMessage in valuesPresentInRequestMessage)
-                {
-                    score += matcher.IsMatch(valuePresentInRequestMessage).Score / matcher.GetPatterns().Length;
-                }
-
-                total.Add(score);
-            }
-        }
-        else
-        {
-            foreach (string valuePresentInRequestMessage in valuesPresentInRequestMessage)
-            {
-                var score = matchers.Max(m => m.IsMatch(valuePresentInRequestMessage).Score);
-                total.Add(score);
-            }
-        }
-
-        return total.Any() ? MatchScores.ToScore(total, MatchOperator.Average) : 0;
+        return MatchScores.ToScore(valuesPresentInRequestMessage, Matchers.ToArray());
     }
 }

src/WireMock.Net.Minimal/RequestBuilders/Request.ClientIP.cs

@@ -19,7 +19,7 @@ public partial class Request
     {
         Guard.NotNullOrEmpty(matchers);
 
-        _requestMatchers.Add(new RequestMessageClientIPMatcher(MatchBehaviour.AcceptOnMatch, MatchOperator.Or, matchers));
+        _requestMatchers.Add(new RequestMessageClientIPMatcher(MatchBehaviour.AcceptOnMatch, matchOperator, matchers));
         return this;
     }
 

src/WireMock.Net.Minimal/RequestBuilders/Request.WithBody.cs

@@ -5,6 +5,7 @@
 using Stef.Validation;
 using WireMock.Matchers;
 using WireMock.Matchers.Request;
+using WireMock.Types;
 using WireMock.Util;
 
 namespace WireMock.RequestBuilders;
@@ -84,7 +85,7 @@ public partial class Request
     }
 
     /// <inheritdoc />
-    public IRequestBuilder WithBody(Func<IDictionary<string, string>?, bool> func)
+    public IRequestBuilder WithBody(Func<IDictionary<string, WireMockList<string>>?, bool> func)
     {
         _requestMatchers.Add(new RequestMessageBodyMatcher(Guard.NotNull(func)));
         return this;

src/WireMock.Net.Minimal/Serialization/MappingConverter.cs

@@ -342,7 +342,7 @@ internal class MappingConverter(MatcherMapper mapper)
         if (clientIPMatcher?.Matchers != null)
         {
             var clientIPMatchers = _mapper.Map(clientIPMatcher.Matchers);
-            mappingModel.Request.Path = new ClientIPModel
+            mappingModel.Request.ClientIP = new ClientIPModel
             {
                 Matchers = clientIPMatchers,
                 MatchOperator = clientIPMatchers?.Length > 1 ? clientIPMatcher.MatchOperator.ToString() : null

src/WireMock.Net.Minimal/Server/WireMockServer.ConvertMapping.cs

@@ -155,7 +155,8 @@ public partial class WireMockServer
                 var clientIPModel = _settings.DefaultJsonSerializer.ParseJsonToken<ClientIPModel>(requestModel.ClientIP);
                 if (clientIPModel.Matchers != null)
                 {
-                    requestBuilder = requestBuilder.WithPath(clientIPModel.Matchers.Select(_matcherMapper.Map).OfType<IStringMatcher>().ToArray());
+                    var matchOperator = StringUtils.ParseMatchOperator(clientIPModel.MatchOperator);
+                    requestBuilder = requestBuilder.WithClientIP(matchOperator, clientIPModel.Matchers.Select(_matcherMapper.Map).OfType<IStringMatcher>().ToArray());
                 }
             }
         }

src/WireMock.Net.Shared/Extensions/AnyOfExtensions.cs

@@ -1,7 +1,5 @@
 // Copyright © WireMock.Net
 
-using System.Collections.Generic;
-using System.Linq;
 using AnyOfTypes;
 using WireMock.Models;
 

src/WireMock.Net.Shared/Matchers/MatchScores.cs

@@ -1,8 +1,6 @@
 // Copyright © WireMock.Net
 
-using System;
-using System.Collections.Generic;
-using System.Linq;
+using WireMock.Types;
 
 namespace WireMock.Matchers;
 
@@ -57,7 +55,7 @@ public static class MatchScores
     /// <param name="values">The values.</param>
     /// <param name="matchOperator">The <see cref="MatchOperator"/>.</param>
     /// <returns>average score</returns>
-    public static double ToScore(IReadOnlyCollection<bool> values, MatchOperator matchOperator)
+    public static double ToScore(IEnumerable<bool> values, MatchOperator matchOperator)
     {
         return ToScore(values.Select(ToScore).ToArray(), matchOperator);
     }
@@ -68,7 +66,7 @@ public static class MatchScores
     /// <param name="values">The values.</param>
     /// <param name="matchOperator"></param>
     /// <returns>average score</returns>
-    public static double ToScore(IReadOnlyCollection<double> values, MatchOperator matchOperator)
+    public static double ToScore(IEnumerable<double> values, MatchOperator matchOperator)
     {
         if (!values.Any())
         {
@@ -82,4 +80,29 @@ public static class MatchScores
             _ => values.Average()
         };
     }
+
+    internal static double ToScore(WireMockList<string> values, IStringMatcher[] matchers, MatchOperator matchOperator = MatchOperator.And)
+    {
+        // Create a matrix of scores where each row corresponds to a value and each column corresponds to a matcher.
+        var matrix = values
+            .Select(value => matchers
+                .Select(matcher => matcher.IsMatch(value).Score).ToArray()
+            )
+            .ToArray();
+
+        if (matrix.Length == 0 || matchers.Length == 0)
+        {
+            return Mismatch;
+        }
+
+        // For each value, how well was it matched by its best matcher?
+        var rowRange = Enumerable.Range(0, matchers.Length);
+        var rowScore = matchOperator == MatchOperator.And ? matrix.Average(row => row.Max()) : matrix.Max(row => row.Max());
+
+        // For each matcher, how well was it satisfied by its best value?
+        var columnRange = Enumerable.Range(0, matchers.Length);
+        var columnScore = matchOperator == MatchOperator.And ? columnRange.Average(column => matrix.Max(row => row[column])) : columnRange.Max(column => matrix.Max(row => row[column]));
+
+        return matchOperator == MatchOperator.And ? Math.Min(rowScore, columnScore) : Math.Max(rowScore, columnScore);
+    }
 }

src/WireMock.Net.Shared/Models/BodyData.cs

@@ -22,7 +22,7 @@ public class BodyData : IBodyData
     public string? BodyAsString { get; set; }
 
     /// <inheritdoc />
-    public IDictionary<string, string>? BodyAsFormUrlEncoded { get; set; }
+    public IDictionary<string, WireMockList<string>>? BodyAsFormUrlEncoded { get; set; }
 
     /// <inheritdoc />
     public object? BodyAsJson { get; set; }

src/WireMock.Net.Shared/RequestBuilders/IBodyRequestBuilder.cs

@@ -1,8 +1,7 @@
 // Copyright © WireMock.Net
 
-using System;
-using System.Collections.Generic;
 using WireMock.Matchers;
+using WireMock.Types;
 using WireMock.Util;
 
 namespace WireMock.RequestBuilders;
@@ -100,5 +99,5 @@ public interface IBodyRequestBuilder : IMultiPartRequestBuilder
     /// </summary>
     /// <param name="func">The form-urlencoded values.</param>
     /// <returns>The <see cref="IRequestBuilder"/>.</returns>
-    IRequestBuilder WithBody(Func<IDictionary<string, string>?, bool> func);
+    IRequestBuilder WithBody(Func<IDictionary<string, WireMockList<string>>?, bool> func);
 }

src/WireMock.Net.Shared/Util/QueryStringParser.cs

@@ -1,9 +1,6 @@
 // Copyright © WireMock.Net
 
-using System;
-using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
-using System.Linq;
 using System.Net;
 using WireMock.Types;
 
@@ -16,7 +13,7 @@ internal static class QueryStringParser
 {
     private static readonly Dictionary<string, WireMockList<string>> Empty = new();
 
-    public static bool TryParse(string? queryString, bool caseIgnore, [NotNullWhen(true)] out IDictionary<string, string>? nameValueCollection)
+    public static bool TryParse(string? queryString, bool caseIgnore, [NotNullWhen(true)] out IDictionary<string, WireMockList<string>>? nameValueCollection)
     {
         if (queryString == null)
         {
@@ -29,12 +26,22 @@ internal static class QueryStringParser
             .Select(parameter => parameter.Split('='))
             .Distinct();
 
-        nameValueCollection = caseIgnore ? new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase) : new Dictionary<string, string>();
+        nameValueCollection = caseIgnore ? new Dictionary<string, WireMockList<string>>(StringComparer.OrdinalIgnoreCase) : new Dictionary<string, WireMockList<string>>();
         foreach (var part in parts)
         {
             if (part.Length == 2)
             {
-                nameValueCollection.Add(part[0], WebUtility.UrlDecode(part[1]));
+                var key = part[0];
+                var value = WebUtility.UrlDecode(part[1]);
+
+                if (!nameValueCollection.TryGetValue(key, out var stringList))
+                {
+                    nameValueCollection.Add(key, value);
+                }
+                else
+                {
+                    stringList.Add(value);
+                }
             }
         }
 

src/WireMock.Net.Testcontainers/WireMock.Net.Testcontainers.csproj

@@ -39,7 +39,7 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <PackageReference Include="Stef.Validation" Version="0.3.0" />
-        <PackageReference Include="Testcontainers" Version="4.12.0" />
+        <PackageReference Include="Testcontainers" Version="4.14.0" />
     </ItemGroup>
 
     <ItemGroup>

test/WireMock.Net.Tests/Abstractions/WireMockListTests.cs

@@ -408,4 +408,209 @@ public class WireMockListTests
     }
 
     #endregion
+
+    #region Equality Operator Tests
+
+    [Fact]
+    public void WireMockListOfString_EqualityOperator_ListToSingleValue_WhenSingleElementMatchesValue_ShouldBeTrue()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello");
+
+        // Act & Assert
+        (list == "hello").Should().BeTrue();
+    }
+
+    [Fact]
+    public void WireMockListOfString_EqualityOperator_ListToSingleValue_WhenSingleElementDoesNotMatchValue_ShouldBeFalse()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello");
+
+        // Act & Assert
+        (list == "world").Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_EqualityOperator_ListToSingleValue_WhenMultipleElements_ShouldBeFalse()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello", "world");
+
+        // Act & Assert
+        (list == "hello").Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_EqualityOperator_SingleValueToList_WhenSingleElementMatchesValue_ShouldBeTrue()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello");
+
+        // Act & Assert
+        ("hello" == list).Should().BeTrue();
+    }
+
+    [Fact]
+    public void WireMockListOfString_EqualityOperator_SingleValueToList_WhenSingleElementDoesNotMatchValue_ShouldBeFalse()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello");
+
+        // Act & Assert
+        ("world" == list).Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_InequalityOperator_ListToSingleValue_WhenSingleElementMatchesValue_ShouldBeFalse()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello");
+
+        // Act & Assert
+        (list != "hello").Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_InequalityOperator_ListToSingleValue_WhenSingleElementDoesNotMatchValue_ShouldBeTrue()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello");
+
+        // Act & Assert
+        (list != "world").Should().BeTrue();
+    }
+
+    [Fact]
+    public void WireMockListOfString_InequalityOperator_SingleValueToList_WhenSingleElementMatchesValue_ShouldBeFalse()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello");
+
+        // Act & Assert
+        ("hello" != list).Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_InequalityOperator_SingleValueToList_WhenSingleElementDoesNotMatchValue_ShouldBeTrue()
+    {
+        // Arrange
+        var list = new WireMockList<string>("hello");
+
+        // Act & Assert
+        ("world" != list).Should().BeTrue();
+    }
+
+    #endregion
+
+    #region Equals and GetHashCode Tests
+
+    [Fact]
+    public void WireMockListOfString_Equals_WhenBothListsHaveSameElements_ShouldBeTrue()
+    {
+        // Arrange
+        var list1 = new WireMockList<string>("a", "b", "c");
+        var list2 = new WireMockList<string>("a", "b", "c");
+
+        // Act & Assert
+        list1.Equals(list2).Should().BeTrue();
+    }
+
+    [Fact]
+    public void WireMockListOfString_Equals_WhenListsHaveDifferentElements_ShouldBeFalse()
+    {
+        // Arrange
+        var list1 = new WireMockList<string>("a", "b");
+        var list2 = new WireMockList<string>("a", "x");
+
+        // Act & Assert
+        list1.Equals(list2).Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_Equals_WhenListsHaveDifferentCounts_ShouldBeFalse()
+    {
+        // Arrange
+        var list1 = new WireMockList<string>("a", "b");
+        var list2 = new WireMockList<string>("a");
+
+        // Act & Assert
+        list1.Equals(list2).Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_Equals_WhenBothEmpty_ShouldBeTrue()
+    {
+        // Arrange
+        var list1 = new WireMockList<string>();
+        var list2 = new WireMockList<string>();
+
+        // Act & Assert
+        list1.Equals(list2).Should().BeTrue();
+    }
+
+    [Fact]
+    public void WireMockListOfString_Equals_WhenSameReference_ShouldBeTrue()
+    {
+        // Arrange
+        var list = new WireMockList<string>("a", "b");
+
+        // Act & Assert
+        list.Equals(list).Should().BeTrue();
+    }
+
+    [Fact]
+    public void WireMockListOfString_Equals_WhenComparedToNull_ShouldBeFalse()
+    {
+        // Arrange
+        var list = new WireMockList<string>("a");
+
+        // Act & Assert
+        list.Equals(null).Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_Equals_WhenComparedToNonWireMockList_ShouldBeFalse()
+    {
+        // Arrange
+        var list = new WireMockList<string>("a");
+
+        // Act & Assert
+        list.Equals(new List<string> { "a" }).Should().BeFalse();
+    }
+
+    [Fact]
+    public void WireMockListOfString_GetHashCode_WhenListsHaveSameElements_ShouldBeEqual()
+    {
+        // Arrange
+        var list1 = new WireMockList<string>("a", "b", "c");
+        var list2 = new WireMockList<string>("a", "b", "c");
+
+        // Act & Assert
+        list1.GetHashCode().Should().Be(list2.GetHashCode());
+    }
+
+    [Fact]
+    public void WireMockListOfString_GetHashCode_WhenListsHaveDifferentElements_ShouldNotBeEqual()
+    {
+        // Arrange
+        var list1 = new WireMockList<string>("a", "b");
+        var list2 = new WireMockList<string>("x", "y");
+
+        // Act & Assert
+        list1.GetHashCode().Should().NotBe(list2.GetHashCode());
+    }
+
+    [Fact]
+    public void WireMockListOfString_GetHashCode_WhenEmpty_ShouldReturnConsistentValue()
+    {
+        // Arrange
+        var list1 = new WireMockList<string>();
+        var list2 = new WireMockList<string>();
+
+        // Act & Assert
+        list1.GetHashCode().Should().Be(list2.GetHashCode());
+    }
+
+    #endregion
 }

test/WireMock.Net.Tests/Matchers/FormUrlEncodedMatcherTests.cs

@@ -1,9 +1,8 @@
 // Copyright © WireMock.Net
 
 using System.Net.Http;
-using AnyOfTypes;
+using WireMock.Extensions;
 using WireMock.Matchers;
-using WireMock.Models;
 
 namespace WireMock.Net.Tests.Matchers;
 
@@ -12,18 +11,26 @@ public class FormUrlEncodedMatcherTest
     private readonly CancellationToken _ct = TestContext.Current.CancellationToken;
 
     [Theory]
-    [InlineData("*=*")]
-    [InlineData("name=John Doe")]
-    [InlineData("name=*")]
-    [InlineData("*=John Doe")]
-    [InlineData("email=johndoe@example.com")]
-    [InlineData("email=*")]
-    [InlineData("*=johndoe@example.com")]
-    [InlineData("name=John Doe", "email=johndoe@example.com")]
-    [InlineData("name=John Doe", "email=*")]
-    [InlineData("name=*", "email=*")]
-    [InlineData("*=John Doe", "*=johndoe@example.com")]
-    public async Task FormUrlEncodedMatcher_IsMatch(params string[] patterns)
+    [InlineData(true, "*=*")]
+    [InlineData(true, "name=John Doe")]
+    [InlineData(false, "name=Stef")]
+    [InlineData(false, "name=John Doe&name=Stef")]
+    [InlineData(true, "name=*")]
+    [InlineData(true, "*=John Doe")]
+    [InlineData(false, "*=Stef")]
+    [InlineData(false, "*=John Doe&*=Stef")]
+    [InlineData(true, "email=johndoe@example.com")]
+    [InlineData(true, "email=*")]
+    [InlineData(true, "*=johndoe@example.com")]
+    [InlineData(true, "name=John Doe", "email=johndoe@example.com")]
+    [InlineData(true, "name=John Doe", "email=*")]
+    [InlineData(true, "name=John Doe&name=Stef", "email=*")]
+    [InlineData(true, "name=Stef", "email=*")]
+    [InlineData(true, "name=*", "email=*")]
+    [InlineData(true, "*=John Doe", "*=johndoe@example.com")]
+    [InlineData(true, "*=Stef", "*=johndoe@example.com")]
+    [InlineData(true, "name=John Doe&name=Stef", "*=johndoe@example.com")]
+    public async Task FormUrlEncodedMatcher_IsMatch_Single_Or(bool expected, params string[] patterns)
     {
         // Arrange
         var content = new FormUrlEncodedContent(
@@ -33,28 +40,76 @@ public class FormUrlEncodedMatcherTest
         ]);
         var contentAsString = await content.ReadAsStringAsync(_ct);
 
-        var matcher = new FormUrlEncodedMatcher(patterns.Select(p => new AnyOf<string, StringPattern>(p)).ToArray());
+        var matcher = new FormUrlEncodedMatcher(patterns.ToAnyOfPatterns());
 
         // Act
         var score = matcher.IsMatch(contentAsString).IsPerfect();
 
         // Assert
-        score.Should().BeTrue();
+        score.Should().Be(expected);
     }
 
     [Theory]
+    [InlineData(true, "*=*")]
     [InlineData(false, "name=John Doe")]
+    [InlineData(false, "name=Stef")]
+    [InlineData(true, "name=John Doe&name=Stef")]
+    [InlineData(true, "name=*")]
+    [InlineData(false, "*=John Doe")]
+    [InlineData(false, "*=Stef")]
+    [InlineData(true, "*=John Doe&*=Stef")]
+    [InlineData(true, "email=johndoe@example.com")]
+    [InlineData(true, "email=*")]
+    [InlineData(true, "*=johndoe@example.com")]
+    [InlineData(true, "name=John Doe", "email=johndoe@example.com")]
+    [InlineData(true, "name=John Doe", "email=*")]
+    [InlineData(true, "name=John Doe&name=Stef", "email=*")]
+    [InlineData(true, "name=Stef", "email=*")]
+    [InlineData(true, "name=*", "email=*")]
+    [InlineData(true, "*=John Doe", "*=johndoe@example.com")]
+    [InlineData(true, "*=Stef", "*=johndoe@example.com")]
+    [InlineData(true, "name=John Doe&name=Stef", "*=johndoe@example.com")]
+    public async Task FormUrlEncodedMatcher_IsMatch_Multiple_Or(bool expected, params string[] patterns)
+    {
+        // Arrange
+        var content = new FormUrlEncodedContent(
+        [
+            new KeyValuePair<string, string>("name", "John Doe"),
+            new KeyValuePair<string, string>("name", "Stef"),
+            new KeyValuePair<string, string>("email", "johndoe@example.com")
+        ]);
+        var contentAsString = await content.ReadAsStringAsync(_ct);
+
+        var matcher = new FormUrlEncodedMatcher(patterns.ToAnyOfPatterns());
+
+        // Act
+        var score = matcher.IsMatch(contentAsString).IsPerfect();
+
+        // Assert
+        score.Should().Be(expected);
+    }
+
+    [Theory]
+    [InlineData(true, "*=*")]
+    [InlineData(false, "name=John Doe")]
+    [InlineData(false, "name=Stef")]
+    [InlineData(false, "name=John Doe&name=Stef")]
     [InlineData(false, "name=*")]
     [InlineData(false, "*=John Doe")]
+    [InlineData(false, "*=Stef")]
+    [InlineData(false, "*=John Doe&*=Stef")]
     [InlineData(false, "email=johndoe@example.com")]
     [InlineData(false, "email=*")]
     [InlineData(false, "*=johndoe@example.com")]
     [InlineData(true, "name=John Doe", "email=johndoe@example.com")]
     [InlineData(true, "name=John Doe", "email=*")]
+    [InlineData(false, "name=John Doe&name=Stef", "email=*")]
+    [InlineData(false, "name=Stef", "email=*")]
     [InlineData(true, "name=*", "email=*")]
     [InlineData(true, "*=John Doe", "*=johndoe@example.com")]
-    [InlineData(true, "*=*")]
-    public async Task FormUrlEncodedMatcher_IsMatch_And(bool expected, params string[] patterns)
+    [InlineData(false, "*=Stef", "*=johndoe@example.com")]
+    [InlineData(false, "name=John Doe&name=Stef", "*=johndoe@example.com")]
+    public async Task FormUrlEncodedMatcher_IsMatch_Single_And(bool expected, params string[] patterns)
     {
         // Arrange
         var content = new FormUrlEncodedContent(
@@ -64,7 +119,47 @@ public class FormUrlEncodedMatcherTest
         ]);
         var contentAsString = await content.ReadAsStringAsync(_ct);
 
-        var matcher = new FormUrlEncodedMatcher(patterns.Select(p => new AnyOf<string, StringPattern>(p)).ToArray(), true, MatchOperator.And);
+        var matcher = new FormUrlEncodedMatcher(patterns.ToAnyOfPatterns(), true, MatchOperator.And);
+
+        // Act
+        var score = matcher.IsMatch(contentAsString).IsPerfect();
+
+        // Assert
+        score.Should().Be(expected);
+    }
+
+    [Theory]
+    [InlineData(true, "*=*")]
+    [InlineData(false, "name=John Doe")]
+    [InlineData(false, "name=Stef")]
+    [InlineData(false, "name=John Doe&name=Stef")]
+    [InlineData(false, "name=*")]
+    [InlineData(false, "*=John Doe")]
+    [InlineData(false, "*=Stef")]
+    [InlineData(false, "*=John Doe&*=Stef")]
+    [InlineData(false, "email=johndoe@example.com")]
+    [InlineData(false, "email=*")]
+    [InlineData(false, "*=johndoe@example.com")]
+    [InlineData(false, "name=John Doe", "email=johndoe@example.com")]
+    [InlineData(false, "name=John Doe", "email=*")]
+    [InlineData(true, "name=John Doe&name=Stef", "email=*")]
+    [InlineData(false, "name=Stef", "email=*")]
+    [InlineData(true, "name=*", "email=*")]
+    [InlineData(false, "*=John Doe", "*=johndoe@example.com")]
+    [InlineData(false, "*=Stef", "*=johndoe@example.com")]
+    [InlineData(true, "name=John Doe&name=Stef", "*=johndoe@example.com")]
+    public async Task FormUrlEncodedMatcher_IsMatch_Multiple_And(bool expected, params string[] patterns)
+    {
+        // Arrange
+        var content = new FormUrlEncodedContent(
+        [
+            new KeyValuePair<string, string>("name", "John Doe"),
+            new KeyValuePair<string, string>("name", "Stef"),
+            new KeyValuePair<string, string>("email", "johndoe@example.com")
+        ]);
+        var contentAsString = await content.ReadAsStringAsync(_ct);
+
+        var matcher = new FormUrlEncodedMatcher(patterns.ToAnyOfPatterns(), true, MatchOperator.And);
 
         // Act
         var score = matcher.IsMatch(contentAsString).IsPerfect();
@@ -74,12 +169,13 @@ public class FormUrlEncodedMatcherTest
     }
 
     [Fact]
-    public async Task FormUrlEncodedMatcher_IsMatch_And_MatchAllProperties()
+    public async Task FormUrlEncodedMatcher_IsMatch_And_MatchAllProperties_Test_1()
     {
         // Arrange
         var content = new FormUrlEncodedContent(
         [
             new KeyValuePair<string, string>("name", "John Doe"),
+            new KeyValuePair<string, string>("name", "Stef"),
             new KeyValuePair<string, string>("email", "johndoe@example.com")
         ]);
         var contentAsString = await content.ReadAsStringAsync(_ct);
@@ -93,4 +189,25 @@ public class FormUrlEncodedMatcherTest
         // Assert
         score.Should().BeFalse();
     }
+
+    [Fact]
+    public async Task FormUrlEncodedMatcher_IsMatch_And_MatchAllProperties_Test_2()
+    {
+        // Arrange
+        var content = new FormUrlEncodedContent(
+        [
+            new KeyValuePair<string, string>("name", "John Doe"),
+            new KeyValuePair<string, string>("name", "Stef"),
+            new KeyValuePair<string, string>("email", "johndoe@example.com")
+        ]);
+        var contentAsString = await content.ReadAsStringAsync(_ct);
+
+        var matcher = new FormUrlEncodedMatcher(["name=*", "email=*", "email=x"], matchOperator: MatchOperator.And);
+
+        // Act
+        var score = matcher.IsMatch(contentAsString).IsPerfect();
+
+        // Assert
+        score.Should().BeFalse();
+    }
 }

test/WireMock.Net.Tests/RequestBuilders/RequestBuilderWithBodyTests.cs

@@ -142,12 +142,12 @@ public class RequestBuilderWithBodyTests
     public void Request_WithBody_FuncFormUrlEncoded()
     {
         // Assign
-        var requestBuilder = Request.Create().UsingAnyMethod().WithBody((IDictionary<string, string>? values) => values != null);
+        var requestBuilder = Request.Create().UsingAnyMethod().WithBody((IDictionary<string, WireMockList<string>>? values) => values != null);
 
         // Act
         var body = new BodyData
         {
-            BodyAsFormUrlEncoded = new Dictionary<string, string>(),
+            BodyAsFormUrlEncoded = new Dictionary<string, WireMockList<string>>(),
             DetectedBodyTypeFromContentType = BodyType.FormUrlEncoded,
             DetectedBodyType = BodyType.FormUrlEncoded
         };

test/WireMock.Net.Tests/RequestBuilders/RequestBuilderWithClientIPTests.cs

@@ -64,4 +64,23 @@ public class RequestBuilderWithClientIPTests
         var requestMatchResult = new RequestMatchResult();
         spec.GetMatchingScore(request, requestMatchResult).Should().Be(1.0);
     }
+
+    [Fact]
+    public void Request_WithClientIP_MatchOperator_And_RequiresAllMatchers()
+    {
+        // given: two matchers combined with And (the client IP must satisfy BOTH)
+        var spec = Request.Create().WithClientIP(MatchOperator.And, new WildcardMatcher("1.2.*"), new WildcardMatcher("*.3.4"));
+
+        // when: an IP matching both matchers -> perfect match
+        var matchesBoth = new RequestMessage(new UrlDetails("http://localhost"), "GET", "1.2.3.4");
+        spec.GetMatchingScore(matchesBoth, new RequestMatchResult()).Should().Be(1.0);
+
+        // when: an IP matching only the first matcher -> mismatch
+        var matchesFirstOnly = new RequestMessage(new UrlDetails("http://localhost"), "GET", "1.2.9.9");
+        spec.GetMatchingScore(matchesFirstOnly, new RequestMatchResult()).Should().Be(0.0);
+
+        // when: an IP matching only the second matcher -> mismatch
+        var matchesSecondOnly = new RequestMessage(new UrlDetails("http://localhost"), "GET", "9.3.4");
+        spec.GetMatchingScore(matchesSecondOnly, new RequestMatchResult()).Should().Be(0.0);
+    }
 }

test/WireMock.Net.Tests/RequestMatchers/RequestMessageParamMatcherTests.cs

@@ -15,7 +15,7 @@ public class RequestMessageParamMatcherTests
     {
         // Assign
         var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=test1"), "GET", "127.0.0.1");
-        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "KeY", true, new[] { "test1" });
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "KeY", true, ["test1"]);
 
         // Act
         var result = new RequestMatchResult();
@@ -30,7 +30,7 @@ public class RequestMessageParamMatcherTests
     {
         // Assign
         var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=test1"), "GET", "127.0.0.1");
-        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, new[] { "test1", "test2" });
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, ["test1", "test2"]);
 
         // Act
         var result = new RequestMatchResult();
@@ -60,7 +60,7 @@ public class RequestMessageParamMatcherTests
     {
         // Assign
         var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=test1,test2,test3"), "GET", "127.0.0.1");
-        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, new IStringMatcher[] { new ExactMatcher("test1", "test2") });
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, [new ExactMatcher("test1", "test2")]);
 
         // Act
         var result = new RequestMatchResult();
@@ -71,18 +71,18 @@ public class RequestMessageParamMatcherTests
     }
 
     [Fact]
-    public void RequestMessageParamMatcher_GetMatchingScore_KeyWith2ValuesPresentInUrl_And_With1ExactStringWith3Patterns_Returns0_66()
+    public void RequestMessageParamMatcher_GetMatchingScore_KeyWith2ValuesPresentInUrl_And_With1ExactStringWith3Patterns_Returns1_0()
     {
         // Assign
         var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=test1,test2"), "GET", "127.0.0.1");
-        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, new IStringMatcher[] { new ExactMatcher("test1", "test2", "test3") });
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, [new ExactMatcher("test1", "test2", "test3")]);
 
         // Act
         var result = new RequestMatchResult();
         double score = matcher.GetMatchingScore(requestMessage, result);
 
         // Assert
-        score.Should().BeApproximately(0.66d, 0.1d);
+        score.Should().Be(1.0d);
     }
 
     [Fact]
@@ -90,7 +90,7 @@ public class RequestMessageParamMatcherTests
     {
         // Assign
         var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=test1,test2"), "GET", "127.0.0.1");
-        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, new[] { "test1", "test2" });
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, ["test1", "test2"]);
 
         // Act
         var result = new RequestMatchResult();
@@ -105,7 +105,7 @@ public class RequestMessageParamMatcherTests
     {
         // Assign
         var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=test1,test2"), "GET", "127.0.0.1");
-        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, new IStringMatcher[] { new ExactMatcher("test1"), new ExactMatcher("test2") });
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, [new ExactMatcher("test1"), new ExactMatcher("test2")]);
 
         // Act
         var result = new RequestMatchResult();
@@ -120,7 +120,7 @@ public class RequestMessageParamMatcherTests
     {
         // Assign
         var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=test0,test2"), "GET", "127.0.0.1");
-        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, new[] { "test1", "test2" });
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, ["test1", "test2"]);
 
         // Act
         var result = new RequestMatchResult();
@@ -135,7 +135,7 @@ public class RequestMessageParamMatcherTests
     {
         // Assign
         var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key"), "GET", "127.0.0.1");
-        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, new[] { "test1", "test2" });
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, ["test1", "test2"]);
 
         // Act
         var result = new RequestMatchResult();
@@ -209,5 +209,79 @@ public class RequestMessageParamMatcherTests
         // Assert
         score.Should().Be(1.0);
     }
-}
 
+    [Fact]
+    public void RequestMessageParamMatcher_RejectOnMatch_WhenValuePresentMatchesPattern_ReturnsMismatch()
+    {
+        // Assign: the param value in the URL matches the reject pattern -> the mapping must be rejected (score 0.0).
+        var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=abc"), "GET", "127.0.0.1");
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.RejectOnMatch, "key", false, ["abc"]);
+
+        // Act
+        var result = new RequestMatchResult();
+        var score = matcher.GetMatchingScore(requestMessage, result);
+
+        // Assert
+        score.Should().Be(0.0d);
+    }
+
+    [Fact]
+    public void RequestMessageParamMatcher_RejectOnMatch_WhenValuePresentDoesNotMatchPattern_ReturnsPerfect()
+    {
+        // Assign: the param value in the URL does NOT match the reject pattern -> the mapping is accepted (score 1.0).
+        var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=xyz"), "GET", "127.0.0.1");
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.RejectOnMatch, "key", false, ["abc"]);
+
+        // Act
+        var result = new RequestMatchResult();
+        var score = matcher.GetMatchingScore(requestMessage, result);
+
+        // Assert
+        score.Should().Be(1.0d);
+    }
+
+    [Fact]
+    public void RequestMessageParamMatcher_RejectOnMatch_WithIgnoreCase_WhenValueMatchesCaseInsensitively_ReturnsMismatch()
+    {
+        // Assign: ignoreCase must still be honored on the inner matcher after the fix.
+        var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=ABC"), "GET", "127.0.0.1");
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.RejectOnMatch, "key", true, ["abc"]);
+
+        // Act
+        var result = new RequestMatchResult();
+        var score = matcher.GetMatchingScore(requestMessage, result);
+
+        // Assert
+        score.Should().Be(0.0d);
+    }
+
+    [Fact]
+    public void RequestMessageParamMatcher_AcceptOnMatch_WhenValuePresentMatchesPattern_ReturnsPerfect()
+    {
+        // Assign
+        var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=abc"), "GET", "127.0.0.1");
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, ["abc"]);
+
+        // Act
+        var result = new RequestMatchResult();
+        var score = matcher.GetMatchingScore(requestMessage, result);
+
+        // Assert
+        score.Should().Be(1.0d);
+    }
+
+    [Fact]
+    public void RequestMessageParamMatcher_AcceptOnMatch_WhenValuePresentDoesNotMatchPattern_ReturnsMismatch()
+    {
+        // Assign
+        var requestMessage = new RequestMessage(new UrlDetails("http://localhost?key=xyz"), "GET", "127.0.0.1");
+        var matcher = new RequestMessageParamMatcher(MatchBehaviour.AcceptOnMatch, "key", false, ["abc"]);
+
+        // Act
+        var result = new RequestMatchResult();
+        var score = matcher.GetMatchingScore(requestMessage, result);
+
+        // Assert
+        score.Should().Be(0.0d);
+    }
+}

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToMappingModel_Request_WithClientIP_And_Path_MapsClientIPToClientIPModel_NotPath.verified.txt

@@ -0,0 +1,29 @@
+{
+  Guid: Guid_1,
+  UpdatedAt: DateTime_1,
+  Title: ,
+  Description: ,
+  Priority: 42,
+  Request: {
+    ClientIP: {
+      Matchers: [
+        {
+          Name: WildcardMatcher,
+          Pattern: 1.2.3.4,
+          IgnoreCase: false
+        }
+      ]
+    },
+    Path: {
+      Matchers: [
+        {
+          Name: WildcardMatcher,
+          Pattern: /foo,
+          IgnoreCase: false
+        }
+      ]
+    }
+  },
+  Response: {},
+  UseWebhooksFireAndForget: false
+}

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToMappingModel_Request_WithClientIP_ReturnsCorrectModel.verified.txt

@@ -5,7 +5,7 @@
   Description: ,
   Priority: 42,
   Request: {
-    Path: {
+    ClientIP: {
       Matchers: [
         {
           Name: WildcardMatcher,

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToMappingModel_Request_WithEarlyMismatch_ReturnsCorrectModel.verified.txt

@@ -5,7 +5,7 @@
   Description: ,
   Priority: 42,
   Request: {
-    Path: {
+    ClientIP: {
       Matchers: [
         {
           Name: WildcardMatcher,

test/WireMock.Net.Tests/Serialization/MappingConverterTests.WithClientIP_And_Path_SurvivesMappingModelRoundTrip_AsClientIPMatcher.verified.txt

@@ -0,0 +1,29 @@
+[
+  {
+    Guid: Guid_1,
+    UpdatedAt: DateTime_1,
+    Request: {
+      ClientIP: {
+        Matchers: [
+          {
+            Name: WildcardMatcher,
+            Pattern: 1.2.3.4,
+            IgnoreCase: false
+          }
+        ]
+      },
+      Path: {
+        Matchers: [
+          {
+            Name: WildcardMatcher,
+            Pattern: /foo,
+            IgnoreCase: false
+          }
+        ]
+      }
+    },
+    Response: {
+      StatusCode: 200
+    }
+  }
+]

test/WireMock.Net.Tests/Serialization/MappingConverterTests.cs

@@ -6,6 +6,7 @@ using WireMock.Models;
 using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
 using WireMock.Serialization;
+using WireMock.Server;
 using WireMock.Settings;
 using WireMock.Types;
 using WireMock.Util;
@@ -376,6 +377,47 @@ message HelloReply {
         return Verify(model);
     }
 
+    [Fact]
+    public Task ToMappingModel_Request_WithClientIP_And_Path_MapsClientIPToClientIPModel_NotPath()
+    {
+        // Arrange: a request that gates on BOTH ClientIP and Path.
+        var request = Request.Create().WithPath("/foo").WithClientIP("1.2.3.4");
+        var response = Response.Create();
+        var mapping = new Mapping(_guid, _updatedAt, string.Empty, string.Empty, null, _settings, request, response, 42, null, null, null, null, null, false, null, null);
+
+        // Act
+        var model = _sut.ToMappingModel(mapping);
+
+        // Assert
+        model.Should().NotBeNull();
+
+        // Verify
+        return Verify(model);
+    }
+
+    [Fact]
+    public Task WithClientIP_And_Path_SurvivesMappingModelRoundTrip_AsClientIPMatcher()
+    {
+        // Arrange: a server with a mapping that gates on BOTH ClientIP and Path.
+        using var source = WireMockServer.Start();
+        source
+            .Given(Request.Create().WithPath("/foo").WithClientIP("1.2.3.4"))
+            .RespondWith(Response.Create().WithSuccess());
+
+        var models = source.MappingModels.ToArray();
+        models.Should().ContainSingle();
+
+        // Act
+        using var target = WireMockServer.Start();
+        target.WithMapping(models);
+
+        // Assert
+        var request = (Request)target.Mappings.Single(m => !m.IsAdminInterface).RequestMatcher;
+
+        // Verify
+        return Verify(target.MappingModels);
+    }
+
     [Fact]
     public Task ToMappingModel_Request_WithHeader_And_Cookie_ReturnsCorrectModel()
     {

test/WireMock.Net.Tests/Util/QueryStringParserTests.cs

@@ -7,27 +7,27 @@ namespace WireMock.Net.Tests.Util;
 
 public class QueryStringParserTests
 {
-    public static IEnumerable<object?[]> QueryStringTestData => new List<object?[]>
+    public static List<object?[]> QueryStringTestData => new()
     {
         new object?[] { null, false, false, null },
-        new object?[] { string.Empty, false, true, new Dictionary<string, string>() },
-        new object?[] { "test", false, true, new Dictionary<string, string>() },
-        new object?[] { "&", false, true, new Dictionary<string, string>() },
-        new object?[] { "&&", false, true, new Dictionary<string, string>() },
-        new object?[] { "a=", false, true, new Dictionary<string, string> { { "a", "" } } },
-        new object?[] { "&a", false, true, new Dictionary<string, string>() },
-        new object?[] { "&a=", false, true, new Dictionary<string, string> { { "a", "" } } },
-        new object?[] { "&key1=value1", false, true, new Dictionary<string, string> { { "key1", "value1" } } },
-        new object?[] { "key1=value1", false, true, new Dictionary<string, string> { { "key1", "value1" } } },
-        new object?[] { "key1=value1&key2=value2", false, true, new Dictionary<string, string> { { "key1", "value1" }, { "key2", "value2" } } },
-        new object?[] { "key1=value1&key2=value2&", false, true, new Dictionary<string, string> { { "key1", "value1" }, { "key2", "value2" } } },
-        new object?[] { "key1=value1&&key2=value2", false, true, new Dictionary<string, string> { { "key1", "value1" }, { "key2", "value2" } } },
-        new object?[] { "&key1=value1&key2=value2&&", false, true, new Dictionary<string, string> { { "key1", "value1" }, { "key2", "value2" } } },
+        new object?[] { string.Empty, false, true, new Dictionary<string, WireMockList<string>>() },
+        new object?[] { "test", false, true, new Dictionary<string, WireMockList<string>>() },
+        new object?[] { "&", false, true, new Dictionary<string, WireMockList<string>>() },
+        new object?[] { "&&", false, true, new Dictionary<string, WireMockList<string>>() },
+        new object?[] { "a=", false, true, new Dictionary<string, WireMockList<string>> { { "a", new WireMockList<string>("") } } },
+        new object?[] { "&a", false, true, new Dictionary<string, WireMockList<string>>() },
+        new object?[] { "&a=", false, true, new Dictionary<string, WireMockList<string>> { { "a", new WireMockList<string>("") } } },
+        new object?[] { "&key1=value1", false, true, new Dictionary<string, WireMockList<string>> { { "key1", new WireMockList<string>("value1") } } },
+        new object?[] { "key1=value1", false, true, new Dictionary<string, WireMockList<string>> { { "key1", new WireMockList<string>("value1") } } },
+        new object?[] { "key1=value1&key2=value2", false, true, new Dictionary<string, WireMockList<string>> { { "key1", new WireMockList<string>("value1") }, { "key2", new WireMockList<string>("value2") } } },
+        new object?[] { "key1=value1&key2=value2&", false, true, new Dictionary<string, WireMockList<string>> { { "key1", new WireMockList<string>("value1") }, { "key2", new WireMockList<string>("value2") } } },
+        new object?[] { "key1=value1&&key2=value2", false, true, new Dictionary<string, WireMockList<string>> { { "key1", new WireMockList<string>("value1") }, { "key2", new WireMockList<string>("value2") } } },
+        new object?[] { "&key1=value1&key2=value2&&", false, true, new Dictionary<string, WireMockList<string>> { { "key1", new WireMockList<string>("value1") }, { "key2", new WireMockList<string>("value2") } } },
     };
 
     [Theory]
     [MemberData(nameof(QueryStringTestData))]
-    public void TryParse_Should_Parse_QueryString(string queryString, bool caseIgnore, bool expectedResult, IDictionary<string, string> expectedOutput)
+    public void TryParse_Should_Parse_QueryString(string queryString, bool caseIgnore, bool expectedResult, IDictionary<string, WireMockList<string>> expectedOutput)
     {
         // Act
         var result = QueryStringParser.TryParse(queryString, caseIgnore, out var actual);
@@ -49,7 +49,7 @@ public class QueryStringParserTests
 
         // Assert
         result.Should().BeTrue();
-        actual.Should().BeEquivalentTo(new Dictionary<string, string> { { "x", "rNaCP7hv8UOmS/JcujdvLw==" } });
+        actual.Should().BeEquivalentTo(new Dictionary<string, WireMockList<string>> { { "x", new WireMockList<string>("rNaCP7hv8UOmS/JcujdvLw==") } });
     }
 
     [Fact]

test/WireMock.Net.Tests/WireMockServerTests.WithBody.cs

@@ -12,6 +12,7 @@ using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
 using WireMock.Server;
 using WireMock.Settings;
+using WireMock.Types;
 
 namespace WireMock.Net.Tests;
 
@@ -339,7 +340,7 @@ public partial class WireMockServerTests
 #endif
 
     [Fact]
-    public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithFunc()
+    public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithFunc1()
     {
         // Arrange
         using var server = WireMockServer.Start();
@@ -364,6 +365,32 @@ public partial class WireMockServerTests
         server.Stop();
     }
 
+    [Fact]
+    public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithFunc2()
+    {
+        // Arrange
+        using var server = WireMockServer.Start();
+        server.Given(
+            Request.Create()
+                .UsingPost()
+                .WithPath("/foo")
+                .WithBody((IDictionary<string, WireMockList<string>>? values) => values != null && values["key1"] == "value1")
+            )
+            .RespondWith(
+                Response.Create()
+            );
+
+        // Act
+        var content = new FormUrlEncodedContent([new KeyValuePair<string, string>("key1", "value1")]);
+        var response = await new HttpClient()
+            .PostAsync($"{server.Url}/foo", content, _ct);
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.OK);
+
+        server.Stop();
+    }
+
     [Fact]
     public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithExactMatcher()
     {

test/WireMock.Net.Tests/WireMockServerTests.WithParam.cs

@@ -93,6 +93,54 @@ public partial class WireMockServerTests
         server.Stop();
     }
 
+    [Fact]
+    public async Task WireMockServer_WithParam_RejectOnMatch_WithValue_WhenValueMatches_ShouldNotMatch_Returns404()
+    {
+        // Arrange
+        var cancelationToken = TestContext.Current.CancellationToken;
+        var server = WireMockServer.Start();
+        server.Given(
+            Request.Create()
+                .WithPath("/x")
+                .WithParam("k", MatchBehaviour.RejectOnMatch, "abc")
+                .UsingGet()
+            )
+            .ThenRespondWithOK();
+
+        // Act
+        var requestUri = new Uri($"http://localhost:{server.Port}/x?k=abc");
+        var response = await server.CreateClient().GetAsync(requestUri, cancelationToken);
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.NotFound);
+
+        server.Stop();
+    }
+
+    [Fact]
+    public async Task WireMockServer_WithParam_RejectOnMatch_WithValue_WhenValueDoesNotMatch_ShouldMatch_Returns200()
+    {
+        // Arrange
+        var cancelationToken = TestContext.Current.CancellationToken;
+        var server = WireMockServer.Start();
+        server.Given(
+            Request.Create()
+                .WithPath("/x")
+                .WithParam("k", MatchBehaviour.RejectOnMatch, "abc")
+                .UsingGet()
+            )
+            .ThenRespondWithOK();
+
+        // Act
+        var requestUri = new Uri($"http://localhost:{server.Port}/x?k=xyz");
+        var response = await server.CreateClient().GetAsync(requestUri, cancelationToken);
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.OK);
+
+        server.Stop();
+    }
+
     [Fact]
     public async Task WireMockServer_WithParam_AcceptOnMatch_OnNonMatchingParam_ShouldReturnMappingOk()
     {