Fix Proxying when StartAdminInterface=true (#778)

* ProxyHelper fixes

* .

* more reformat

* .

WireMock.Net Solution.sln.DotSettings

@@ -7,6 +7,7 @@
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=SSL/@EntryIndexedValue">SSL</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=TE/@EntryIndexedValue">TE</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=TSV/@EntryIndexedValue">TSV</s:String>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=TTL/@EntryIndexedValue">TTL</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=WWW/@EntryIndexedValue">WWW</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=XMS/@EntryIndexedValue">XMS</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=XUA/@EntryIndexedValue">XUA</s:String>

src/WireMock.Net.Abstractions/Admin/Requests/LogEntryModel.cs

@@ -30,12 +30,12 @@ public class LogEntryModel
     /// <summary>
     /// The mapping unique title.
     /// </summary>
-    public string MappingTitle { get; set; }
+    public string? MappingTitle { get; set; }
 
     /// <summary>
     /// The request match result.
     /// </summary>
-    public LogRequestMatchModel RequestMatchResult { get; set; }
+    public LogRequestMatchModel? RequestMatchResult { get; set; }
 
     /// <summary>
     /// The partial mapping unique identifier.
@@ -45,10 +45,10 @@ public class LogEntryModel
     /// <summary>
     /// The partial mapping unique title.
     /// </summary>
-    public string PartialMappingTitle { get; set; }
+    public string? PartialMappingTitle { get; set; }
 
     /// <summary>
     /// The partial request match result.
     /// </summary>
-    public LogRequestMatchModel PartialRequestMatchResult { get; set; }
+    public LogRequestMatchModel? PartialRequestMatchResult { get; set; }
 }

src/WireMock.Net.Abstractions/IRequestMessage.cs

@@ -63,12 +63,12 @@ public interface IRequestMessage
     /// <summary>
     /// Gets the headers.
     /// </summary>
-    IDictionary<string, WireMockList<string>>? Headers { get; }
+    IDictionary<string, WireMockList<string>> Headers { get; }
 
     /// <summary>
     /// Gets the cookies.
     /// </summary>
-    IDictionary<string, string>? Cookies { get; }
+    IDictionary<string, string> Cookies { get; }
 
     /// <summary>
     /// Gets the query.

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

@@ -1,7 +1,7 @@
 using System;
 
-namespace WireMock.Models
+namespace WireMock.Models;
-{
+
 /// <summary>
 /// TimeSettings: Start, End and TTL
 /// </summary>
@@ -22,4 +22,3 @@ namespace WireMock.Models
     /// </summary>
     int? TTL { get; set; }
 }
-}

src/WireMock.Net/Extensions/TimeSettingsExtensions.cs

@@ -1,12 +1,11 @@
 using System;
-using JetBrains.Annotations;
 using WireMock.Models;
 
-namespace WireMock.Extensions
+namespace WireMock.Extensions;
-{
+
 internal static class TimeSettingsExtensions
 {
-        public static bool IsValid([CanBeNull] this ITimeSettings settings)
+    public static bool IsValid(this ITimeSettings? settings)
     {
         if (settings == null)
         {
@@ -14,8 +13,9 @@ namespace WireMock.Extensions
         }
 
         var now = DateTime.Now;
-            var start = settings.Start != null ? settings.Start.Value : now;
+        var start = settings.Start ?? now;
         DateTime end;
+
         if (settings.End != null)
         {
             end = settings.End.Value;
@@ -32,4 +32,3 @@ namespace WireMock.Extensions
         return now >= start && now <= end;
     }
 }
-}

src/WireMock.Net/IMapping.cs

@@ -20,22 +20,22 @@ public interface IMapping
     /// <summary>
     /// Gets the TimeSettings (Start, End and TTL).
     /// </summary>
-    ITimeSettings TimeSettings { get; }
+    ITimeSettings? TimeSettings { get; }
 
     /// <summary>
     /// Gets the unique title.
     /// </summary>
-    string Title { get; }
+    string? Title { get; }
 
     /// <summary>
     /// Gets the description.
     /// </summary>
-    string Description { get; }
+    string? Description { get; }
 
     /// <summary>
     /// The full filename path for this mapping (only defined for static mappings).
     /// </summary>
-    string Path { get; set; }
+    string? Path { get; set; }
 
     /// <summary>
     /// Gets the priority.  (A low value means higher priority.)

src/WireMock.Net/Mapping.cs

@@ -1,13 +1,12 @@
 using System;
 using System.Threading.Tasks;
-using JetBrains.Annotations;
 using WireMock.Matchers.Request;
 using WireMock.Models;
 using WireMock.ResponseProviders;
 using WireMock.Settings;
 
-namespace WireMock
+namespace WireMock;
-{
+
 /// <summary>
 /// The Mapping.
 /// </summary>
@@ -17,25 +16,25 @@ namespace WireMock
     public Guid Guid { get; }
 
     /// <inheritdoc />
-        public string Title { get; }
+    public string? Title { get; }
 
     /// <inheritdoc />
-        public string Description { get; }
+    public string? Description { get; }
 
     /// <inheritdoc />
-        public string Path { get; set; }
+    public string? Path { get; set; }
 
     /// <inheritdoc />
     public int Priority { get; }
 
     /// <inheritdoc />
-        public string Scenario { get; }
+    public string? Scenario { get; }
 
     /// <inheritdoc />
-        public string ExecutionConditionState { get; }
+    public string? ExecutionConditionState { get; }
 
     /// <inheritdoc />
-        public string NextState { get; }
+    public string? NextState { get; }
 
     /// <inheritdoc />
     public int? StateTimes { get; }
@@ -53,19 +52,19 @@ namespace WireMock
     public bool IsStartState => Scenario == null || Scenario != null && NextState != null && ExecutionConditionState == null;
 
     /// <inheritdoc />
-        public bool IsAdminInterface => Provider is DynamicResponseProvider || Provider is DynamicAsyncResponseProvider || Provider is ProxyAsyncResponseProvider;
+    public bool IsAdminInterface => Provider is DynamicResponseProvider or DynamicAsyncResponseProvider or ProxyAsyncResponseProvider;
 
     /// <inheritdoc />
     public bool IsProxy => Provider is ProxyAsyncResponseProvider;
 
     /// <inheritdoc />
-        public bool LogMapping => !(Provider is DynamicResponseProvider || Provider is DynamicAsyncResponseProvider);
+    public bool LogMapping => Provider is not (DynamicResponseProvider or DynamicAsyncResponseProvider);
 
     /// <inheritdoc />
-        public IWebhook[] Webhooks { get; }
+    public IWebhook[]? Webhooks { get; }
 
     /// <inheritdoc />
-        public ITimeSettings TimeSettings { get; }
+    public ITimeSettings? TimeSettings { get; }
 
     /// <summary>
     /// Initializes a new instance of the <see cref="Mapping"/> class.
@@ -123,7 +122,7 @@ namespace WireMock
     }
 
     /// <inheritdoc cref="IMapping.GetRequestMatchResult" />
-        public IRequestMatchResult GetRequestMatchResult(IRequestMessage requestMessage, string nextState)
+    public IRequestMatchResult GetRequestMatchResult(IRequestMessage requestMessage, string? nextState)
     {
         var result = new RequestMatchResult();
 
@@ -146,4 +145,3 @@ namespace WireMock
         return result;
     }
 }
-}

src/WireMock.Net/Matchers/Request/RequestMessageScenarioAndStateMatcher.cs

@@ -1,7 +1,5 @@
-using JetBrains.Annotations;
+namespace WireMock.Matchers.Request;
 
-namespace WireMock.Matchers.Request
-{
 /// <summary>
 /// The scenario and state matcher.
 /// </summary>
@@ -10,22 +8,20 @@ namespace WireMock.Matchers.Request
     /// <summary>
     /// Execution state condition for the current mapping.
     /// </summary>
-        [CanBeNull]
+    private readonly string? _executionConditionState;
-        private readonly string _executionConditionState;
 
     /// <summary>
     /// The next state which will be signaled after the current mapping execution.
     /// In case the value is null state will not be changed.
     /// </summary>
-        [CanBeNull]
+    private readonly string? _nextState;
-        private readonly string _nextState;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="RequestMessageScenarioAndStateMatcher"/> class.
     /// </summary>
     /// <param name="nextState">The next state.</param>
     /// <param name="executionConditionState">Execution state condition for the current mapping.</param>
-        public RequestMessageScenarioAndStateMatcher([CanBeNull] string nextState, [CanBeNull] string executionConditionState)
+    public RequestMessageScenarioAndStateMatcher(string? nextState, string? executionConditionState)
     {
         _nextState = nextState;
         _executionConditionState = executionConditionState;
@@ -43,4 +39,3 @@ namespace WireMock.Matchers.Request
         return Equals(_executionConditionState, _nextState) ? MatchScores.Perfect : MatchScores.Mismatch;
     }
 }
-}

src/WireMock.Net/Owin/AspNetCoreSelfHost.NETCore.cs

@@ -3,8 +3,8 @@ using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
 using WireMock.Types;
 
-namespace WireMock.Owin
+namespace WireMock.Owin;
-{
+
 internal partial class AspNetCoreSelfHost
 {
     public void AddCors(IServiceCollection services)
@@ -44,5 +44,4 @@ namespace WireMock.Owin
         }
     }
 }
-}
 #endif

src/WireMock.Net/Owin/AspNetCoreSelfHost.cs

@@ -36,10 +36,10 @@ namespace WireMock.Owin
 
         public Exception RunningException => _runningException;
 
-        public AspNetCoreSelfHost([NotNull] IWireMockMiddlewareOptions wireMockMiddlewareOptions, [NotNull] HostUrlOptions urlOptions)
+        public AspNetCoreSelfHost(IWireMockMiddlewareOptions wireMockMiddlewareOptions, HostUrlOptions urlOptions)
         {
-            Guard.NotNull(wireMockMiddlewareOptions, nameof(wireMockMiddlewareOptions));
+            Guard.NotNull(wireMockMiddlewareOptions);
-            Guard.NotNull(urlOptions, nameof(urlOptions));
+            Guard.NotNull(urlOptions);
 
             _logger = wireMockMiddlewareOptions.Logger ?? new WireMockConsoleLogger();
 
@@ -119,7 +119,7 @@ namespace WireMock.Owin
                     {
                         Urls.Add(address.Replace("0.0.0.0", "localhost").Replace("[::]", "localhost"));
 
-                        PortUtils.TryExtract(address, out bool isHttps, out string protocol, out string host, out int port);
+                        PortUtils.TryExtract(address, out _, out _, out _, out int port);
                         Ports.Add(port);
                     }
 

src/WireMock.Net/Owin/HostUrlDetails.cs

@@ -1,6 +1,6 @@
-namespace WireMock.Owin
+namespace WireMock.Owin;
-{
+
-    internal class HostUrlDetails
+internal struct HostUrlDetails
 {
     public bool IsHttps { get; set; }
 
@@ -12,4 +12,3 @@
 
     public int Port { get; set; }
 }
-}

src/WireMock.Net/Owin/HostUrlOptions.cs

@@ -1,13 +1,13 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using WireMock.Util;
 
-namespace WireMock.Owin
+namespace WireMock.Owin;
-{
+
 internal class HostUrlOptions
 {
     private const string LOCALHOST = "localhost";
 
-        public ICollection<string> Urls { get; set; }
+    public ICollection<string>? Urls { get; set; }
 
     public int? Port { get; set; }
 
@@ -26,15 +26,17 @@ namespace WireMock.Owin
         {
             foreach (string url in Urls)
             {
-                    PortUtils.TryExtract(url, out bool isHttps, out string protocol, out string host, out int port);
+                if (PortUtils.TryExtract(url, out bool isHttps, out var protocol, out var host, out int port))
+                {
                     list.Add(new HostUrlDetails { IsHttps = isHttps, Url = url, Protocol = protocol, Host = host, Port = port });
                 }
             }
+        }
 
         return list;
     }
 
-        private int FindFreeTcpPort()
+    private static int FindFreeTcpPort()
     {
 #if USE_ASPNETCORE || NETSTANDARD2_0 || NETSTANDARD2_1
         return 0;
@@ -43,4 +45,3 @@ namespace WireMock.Owin
 #endif
     }
 }
-}

src/WireMock.Net/Owin/IMappingMatcher.cs

@@ -1,7 +1,6 @@
-namespace WireMock.Owin
+namespace WireMock.Owin;
-{
+
 internal interface IMappingMatcher
 {
-        (MappingMatcherResult Match, MappingMatcherResult Partial) FindBestMatch(RequestMessage request);
+    (MappingMatcherResult? Match, MappingMatcherResult? Partial) FindBestMatch(RequestMessage request);
-    }
 }

src/WireMock.Net/Owin/IOwinSelfHost.cs

@@ -1,9 +1,9 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using System;
 
-namespace WireMock.Owin
+namespace WireMock.Owin;
-{
+
 interface IOwinSelfHost
 {
     /// <summary>
@@ -25,12 +25,11 @@ namespace WireMock.Owin
     List<int> Ports { get; }
 
     /// <summary>
-        /// The exception occurred when the host is running
+    /// The exception occurred when the host is running.
     /// </summary>
-        Exception RunningException { get; }
+    Exception? RunningException { get; }
 
     Task StartAsync();
 
     Task StopAsync();
 }
-}

src/WireMock.Net/Owin/Mappers/OwinRequestMapper.cs

@@ -27,7 +27,7 @@ namespace WireMock.Owin.Mappers
 
             string method = request.Method;
 
-            Dictionary<string, string[]>? headers = null;
+            var headers = new Dictionary<string, string[]>();
             IEnumerable<string>? contentEncodingHeader = null;
             if (request.Headers.Any())
             {
@@ -43,7 +43,7 @@ namespace WireMock.Owin.Mappers
                 }
             }
 
-            IDictionary<string, string>? cookies = null;
+            var cookies = new Dictionary<string, string>();
             if (request.Cookies.Any())
             {
                 cookies = new Dictionary<string, string>();
@@ -75,13 +75,24 @@ namespace WireMock.Owin.Mappers
         {
 #if !USE_ASPNETCORE
             var urlDetails = UrlUtils.Parse(request.Uri, request.PathBase);
-            string clientIP = request.RemoteIpAddress;
+            var clientIP = request.RemoteIpAddress;
 #else
             var urlDetails = UrlUtils.Parse(new Uri(request.GetEncodedUrl()), request.PathBase);
+
             var connection = request.HttpContext.Connection;
-            string clientIP = connection.RemoteIpAddress.IsIPv4MappedToIPv6
+            string clientIP;
-                ? connection.RemoteIpAddress.MapToIPv4().ToString()
+            if (connection.RemoteIpAddress is null)
-                : connection.RemoteIpAddress.ToString();
+            {
+                clientIP = string.Empty;
+            }
+            else if (connection.RemoteIpAddress.IsIPv4MappedToIPv6)
+            {
+                clientIP = connection.RemoteIpAddress.MapToIPv4().ToString();
+            }
+            else
+            {
+                clientIP = connection.RemoteIpAddress.ToString();
+            }
 #endif
             return (urlDetails, clientIP);
         }

src/WireMock.Net/Owin/MappingMatcher.cs

@@ -4,8 +4,8 @@ using System.Linq;
 using WireMock.Extensions;
 using Stef.Validation;
 
-namespace WireMock.Owin
+namespace WireMock.Owin;
-{
+
 internal class MappingMatcher : IMappingMatcher
 {
     private readonly IWireMockMiddlewareOptions _options;
@@ -17,17 +17,17 @@ namespace WireMock.Owin
         _options = options;
     }
 
-        public (MappingMatcherResult Match, MappingMatcherResult Partial) FindBestMatch(RequestMessage request)
+    public (MappingMatcherResult? Match, MappingMatcherResult? Partial) FindBestMatch(RequestMessage request)
     {
-            var mappings = new List<MappingMatcherResult>();
+        var possibleMappings = new List<MappingMatcherResult>();
 
         foreach (var mapping in _options.Mappings.Values.Where(m => m.TimeSettings.IsValid()))
         {
             try
             {
-                    string nextState = GetNextState(mapping);
+                var nextState = GetNextState(mapping);
 
-                    mappings.Add(new MappingMatcherResult
+                possibleMappings.Add(new MappingMatcherResult
                 {
                     Mapping = mapping,
                     RequestMatchResult = mapping.GetRequestMatchResult(request, nextState)
@@ -39,7 +39,7 @@ namespace WireMock.Owin
             }
         }
 
-            var partialMappings = mappings
+        var partialMappings = possibleMappings
             .Where(pm => (pm.Mapping.IsAdminInterface && pm.RequestMatchResult.IsPerfectMatch) || !pm.Mapping.IsAdminInterface)
             .OrderBy(m => m.RequestMatchResult)
             .ThenBy(m => m.Mapping.Priority)
@@ -51,7 +51,7 @@ namespace WireMock.Owin
             return (partialMatch, partialMatch);
         }
 
-            var match = mappings
+        var match = possibleMappings
             .Where(m => m.RequestMatchResult.IsPerfectMatch)
             .OrderBy(m => m.Mapping.Priority).ThenBy(m => m.RequestMatchResult)
             .FirstOrDefault();
@@ -59,7 +59,7 @@ namespace WireMock.Owin
         return (match, partialMatch);
     }
 
-        private string GetNextState(IMapping mapping)
+    private string? GetNextState(IMapping mapping)
     {
         // If the mapping does not have a scenario or _options.Scenarios does not contain this scenario from the mapping,
         // just return null to indicate that there is no next state.
@@ -72,4 +72,3 @@ namespace WireMock.Owin
         return _options.Scenarios[mapping.Scenario].NextState;
     }
 }
-}

src/WireMock.Net/Owin/MappingMatcherResult.cs

@@ -1,11 +1,10 @@
 using WireMock.Matchers.Request;
 
-namespace WireMock.Owin
+namespace WireMock.Owin;
-{
+
 internal class MappingMatcherResult
 {
     public IMapping Mapping { get; set; }
 
     public IRequestMatchResult RequestMatchResult { get; set; }
 }
-}

src/WireMock.Net/Owin/OwinSelfHost.cs

@@ -1,26 +1,26 @@
 #if !USE_ASPNETCORE
-using JetBrains.Annotations;
 using Microsoft.Owin.Hosting;
 using Owin;
 using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
+using JetBrains.Annotations;
 using WireMock.Logging;
 using WireMock.Owin.Mappers;
 using Stef.Validation;
 
-namespace WireMock.Owin
+namespace WireMock.Owin;
-{
+
 internal class OwinSelfHost : IOwinSelfHost
 {
     private readonly IWireMockMiddlewareOptions _options;
-        private readonly CancellationTokenSource _cts = new CancellationTokenSource();
+    private readonly CancellationTokenSource _cts = new();
     private readonly IWireMockLogger _logger;
 
-        private Exception _runningException;
+    private Exception? _runningException;
 
-        public OwinSelfHost([NotNull] IWireMockMiddlewareOptions options, [NotNull] HostUrlOptions urlOptions)
+    public OwinSelfHost(IWireMockMiddlewareOptions options, HostUrlOptions urlOptions)
     {
         Guard.NotNull(options, nameof(options));
         Guard.NotNull(urlOptions, nameof(urlOptions));
@@ -37,11 +37,11 @@ namespace WireMock.Owin
 
     public bool IsStarted { get; private set; }
 
-        public List<string> Urls { get; } = new List<string>();
+    public List<string> Urls { get; } = new();
 
-        public List<int> Ports { get; } = new List<int>();
+    public List<int> Ports { get; } = new();
 
-        public Exception RunningException => _runningException;
+    public Exception? RunningException => _runningException;
 
     [PublicAPI]
     public Task StartAsync()
@@ -107,5 +107,4 @@ namespace WireMock.Owin
         }
     }
 }
-}
 #endif

src/WireMock.Net/Owin/WireMockMiddleware.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Threading.Tasks;
 using System.Linq;
+using System.Net;
 using Stef.Validation;
 using WireMock.Logging;
 using WireMock.Matchers;
@@ -74,10 +75,16 @@ namespace WireMock.Owin
             var logRequest = false;
             IResponseMessage? response = null;
             (MappingMatcherResult? Match, MappingMatcherResult? Partial) result = (null, null);
+
             try
             {
-                foreach (var mapping in _options.Mappings.Values.Where(m => m?.Scenario != null))
+                foreach (var mapping in _options.Mappings.Values)
                 {
+                    if (mapping.Scenario is null)
+                    {
+                        continue;
+                    }
+
                     // Set scenario start
                     if (!_options.Scenarios.ContainsKey(mapping.Scenario) && mapping.IsStartState)
                     {
@@ -107,7 +114,7 @@ namespace WireMock.Owin
                     if (!present || _options.AuthenticationMatcher.IsMatch(authorization.ToString()) < MatchScores.Perfect)
                     {
                         _options.Logger.Error("HttpStatusCode set to 401");
-                        response = ResponseMessageBuilder.Create(null, 401);
+                        response = ResponseMessageBuilder.Create(null, HttpStatusCode.Unauthorized);
                         return;
                     }
                 }
@@ -194,7 +201,7 @@ namespace WireMock.Owin
 
         private async Task SendToWebhooksAsync(IMapping mapping, IRequestMessage request, IResponseMessage response)
         {
-            for (int index = 0; index < mapping.Webhooks.Length; index++)
+            for (int index = 0; index < mapping.Webhooks?.Length; index++)
             {
                 var httpClientForWebhook = HttpClientBuilder.Build(mapping.Settings.WebhookSettings ?? new WebhookSettings());
                 var webhookSender = new WebhookSender(mapping.Settings);
@@ -212,7 +219,7 @@ namespace WireMock.Owin
 
         private void UpdateScenarioState(IMapping mapping)
         {
-            var scenario = _options.Scenarios[mapping.Scenario];
+            var scenario = _options.Scenarios[mapping.Scenario!];
 
             // Increase the number of times this state has been executed
             scenario.Counter++;

src/WireMock.Net/Proxy/ProxyHelper.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using System.Net.Http;
 using System.Threading.Tasks;
 using Stef.Validation;
+using WireMock.Constants;
 using WireMock.Http;
 using WireMock.Matchers;
 using WireMock.RequestBuilders;
@@ -29,9 +30,9 @@ internal class ProxyHelper
         IRequestMessage requestMessage,
         string url)
     {
-        Guard.NotNull(client, nameof(client));
+        Guard.NotNull(client);
-        Guard.NotNull(requestMessage, nameof(requestMessage));
+        Guard.NotNull(requestMessage);
-        Guard.NotNull(url, nameof(url));
+        Guard.NotNull(url);
 
         var originalUri = new Uri(requestMessage.Url);
         var requiredUri = new Uri(url);
@@ -103,6 +104,22 @@ internal class ProxyHelper
 
         var response = Response.Create(responseMessage);
 
-        return new Mapping(Guid.NewGuid(), string.Empty, string.Empty, null, _settings, request, response, 0, null, null, null, null, null, null);
+        return new Mapping
+        (
+            guid: Guid.NewGuid(),
+            title: $"Proxy Mapping for {requestMessage.Method} {requestMessage.Path}",
+            description: string.Empty,
+            path: null,
+            settings: _settings,
+            request,
+            response,
+            priority: WireMockConstants.ProxyPriority, // This was 0
+            scenario: null,
+            executionConditionState: null,
+            nextState: null,
+            stateTimes: null,
+            webhooks: null,
+            timeSettings: null
+        );
     }
 }

src/WireMock.Net/RequestMessage.cs

@@ -47,10 +47,10 @@ public class RequestMessage : IRequestMessage
     public string Method { get; }
 
     /// <inheritdoc cref="IRequestMessage.Headers" />
-    public IDictionary<string, WireMockList<string>>? Headers { get; }
+    public IDictionary<string, WireMockList<string>> Headers { get; }
 
     /// <inheritdoc cref="IRequestMessage.Cookies" />
-    public IDictionary<string, string>? Cookies { get; }
+    public IDictionary<string, string> Cookies { get; }
 
     /// <inheritdoc cref="IRequestMessage.Query" />
     public IDictionary<string, WireMockList<string>>? Query { get; }

src/WireMock.Net/ResponseMessageBuilder.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Net;
 using WireMock.Admin.Mappings;
 using WireMock.Constants;
 using WireMock.Http;
@@ -15,6 +16,11 @@ internal static class ResponseMessageBuilder
         { HttpKnownHeaderNames.ContentType, new WireMockList<string> { WireMockConstants.ContentTypeJson } }
     };
 
+    internal static ResponseMessage Create(string? message, HttpStatusCode statusCode, Guid? guid = null)
+    {
+        return Create(message, (int)statusCode, guid);
+    }
+
     internal static ResponseMessage Create(string? message, int statusCode = 200, Guid? guid = null)
     {
         var response = new ResponseMessage

src/WireMock.Net/Serialization/LogEntryMapper.cs

@@ -6,8 +6,8 @@ using WireMock.Matchers.Request;
 using WireMock.ResponseBuilders;
 using WireMock.Types;
 
-namespace WireMock.Serialization
+namespace WireMock.Serialization;
-{
+
 internal static class LogEntryMapper
 {
     public static LogEntryModel Map(ILogEntry logEntry)
@@ -124,7 +124,7 @@ namespace WireMock.Serialization
         };
     }
 
-        private static LogRequestMatchModel Map(IRequestMatchResult matchResult)
+    private static LogRequestMatchModel? Map(IRequestMatchResult? matchResult)
     {
         if (matchResult == null)
         {
@@ -145,4 +145,3 @@ namespace WireMock.Serialization
         };
     }
 }
-}

src/WireMock.Net/Serialization/TimeSettingsMapper.cs

@@ -1,10 +1,10 @@
 using WireMock.Models;
 
-namespace WireMock.Serialization
+namespace WireMock.Serialization;
-{
+
 internal static class TimeSettingsMapper
 {
-        public static TimeSettingsModel Map(ITimeSettings settings)
+    public static TimeSettingsModel? Map(ITimeSettings? settings)
     {
         return settings != null ? new TimeSettingsModel
         {
@@ -14,7 +14,7 @@ namespace WireMock.Serialization
         } : null;
     }
 
-        public static ITimeSettings Map(TimeSettingsModel settings)
+    public static ITimeSettings? Map(TimeSettingsModel? settings)
     {
         return settings != null ? new TimeSettings
         {
@@ -24,4 +24,3 @@ namespace WireMock.Serialization
         } : null;
     }
 }
-}

src/WireMock.Net/Server/WireMockServer.Admin.cs

@@ -20,7 +20,6 @@ using WireMock.Matchers;
 using WireMock.Matchers.Request;
 using WireMock.Proxy;
 using WireMock.RequestBuilders;
-using WireMock.ResponseBuilders;
 using WireMock.ResponseProviders;
 using WireMock.Serialization;
 using WireMock.Settings;
@@ -43,10 +42,10 @@ public partial class WireMockServer
     private const string AdminScenarios = "/__admin/scenarios";
     private const string QueryParamReloadStaticMappings = "reloadStaticMappings";
 
-    private readonly Guid _proxyMappingGuid = new("e59914fd-782e-428e-91c1-4810ffb86567");
+    private static readonly Guid ProxyMappingGuid = new("e59914fd-782e-428e-91c1-4810ffb86567");
-    private readonly RegexMatcher _adminRequestContentTypeJson = new ContentTypeMatcher(WireMockConstants.ContentTypeJson, true);
+    private static readonly RegexMatcher AdminRequestContentTypeJson = new ContentTypeMatcher(WireMockConstants.ContentTypeJson, true);
-    private readonly RegexMatcher _adminMappingsGuidPathMatcher = new(@"^\/__admin\/mappings\/([0-9A-Fa-f]{8}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{12})$");
+    private static readonly RegexMatcher AdminMappingsGuidPathMatcher = new(@"^\/__admin\/mappings\/([0-9A-Fa-f]{8}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{12})$");
-    private readonly RegexMatcher _adminRequestsGuidPathMatcher = new(@"^\/__admin\/requests\/([0-9A-Fa-f]{8}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{12})$");
+    private static readonly RegexMatcher AdminRequestsGuidPathMatcher = new(@"^\/__admin\/requests\/([0-9A-Fa-f]{8}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{12})$");
 
     private EnhancedFileSystemWatcher? _enhancedFileSystemWatcher;
 
@@ -55,21 +54,21 @@ public partial class WireMockServer
     {
         // __admin/settings
         Given(Request.Create().WithPath(AdminSettings).UsingGet()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(SettingsGet));
-        Given(Request.Create().WithPath(AdminSettings).UsingMethod("PUT", "POST").WithHeader(HttpKnownHeaderNames.ContentType, _adminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(SettingsUpdate));
+        Given(Request.Create().WithPath(AdminSettings).UsingMethod("PUT", "POST").WithHeader(HttpKnownHeaderNames.ContentType, AdminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(SettingsUpdate));
 
         // __admin/mappings
         Given(Request.Create().WithPath(AdminMappings).UsingGet()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingsGet));
-        Given(Request.Create().WithPath(AdminMappings).UsingPost().WithHeader(HttpKnownHeaderNames.ContentType, _adminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingsPost));
+        Given(Request.Create().WithPath(AdminMappings).UsingPost().WithHeader(HttpKnownHeaderNames.ContentType, AdminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingsPost));
-        Given(Request.Create().WithPath(AdminMappingsWireMockOrg).UsingPost().WithHeader(HttpKnownHeaderNames.ContentType, _adminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingsPostWireMockOrg));
+        Given(Request.Create().WithPath(AdminMappingsWireMockOrg).UsingPost().WithHeader(HttpKnownHeaderNames.ContentType, AdminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingsPostWireMockOrg));
         Given(Request.Create().WithPath(AdminMappings).UsingDelete()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingsDelete));
 
         // __admin/mappings/reset
         Given(Request.Create().WithPath(AdminMappings + "/reset").UsingPost()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingsReset));
 
         // __admin/mappings/{guid}
-        Given(Request.Create().WithPath(_adminMappingsGuidPathMatcher).UsingGet()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingGet));
+        Given(Request.Create().WithPath(AdminMappingsGuidPathMatcher).UsingGet()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingGet));
-        Given(Request.Create().WithPath(_adminMappingsGuidPathMatcher).UsingPut().WithHeader(HttpKnownHeaderNames.ContentType, _adminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingPut));
+        Given(Request.Create().WithPath(AdminMappingsGuidPathMatcher).UsingPut().WithHeader(HttpKnownHeaderNames.ContentType, AdminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingPut));
-        Given(Request.Create().WithPath(_adminMappingsGuidPathMatcher).UsingDelete()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingDelete));
+        Given(Request.Create().WithPath(AdminMappingsGuidPathMatcher).UsingDelete()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingDelete));
 
         // __admin/mappings/save
         Given(Request.Create().WithPath($"{AdminMappings}/save").UsingPost()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingsSave));
@@ -85,8 +84,8 @@ public partial class WireMockServer
         Given(Request.Create().WithPath(AdminRequests + "/reset").UsingPost()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(RequestsDelete));
 
         // __admin/request/{guid}
-        Given(Request.Create().WithPath(_adminRequestsGuidPathMatcher).UsingGet()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(RequestGet));
+        Given(Request.Create().WithPath(AdminRequestsGuidPathMatcher).UsingGet()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(RequestGet));
-        Given(Request.Create().WithPath(_adminRequestsGuidPathMatcher).UsingDelete()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(RequestDelete));
+        Given(Request.Create().WithPath(AdminRequestsGuidPathMatcher).UsingDelete()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(RequestDelete));
 
         // __admin/requests/find
         Given(Request.Create().WithPath(AdminRequests + "/find").UsingPost()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(RequestsFind));
@@ -186,7 +185,7 @@ public partial class WireMockServer
 
         string filenameWithoutExtension = Path.GetFileNameWithoutExtension(path);
 
-        if (FileHelper.TryReadMappingFileWithRetryAndDelay(_settings.FileSystemHandler, path, out string value))
+        if (FileHelper.TryReadMappingFileWithRetryAndDelay(_settings.FileSystemHandler, path, out var value))
         {
             var mappingModels = DeserializeJsonToArray<MappingModel>(value);
             foreach (var mappingModel in mappingModels)
@@ -216,13 +215,13 @@ public partial class WireMockServer
         if (settings.ProxyAndRecordSettings == null)
         {
             _httpClientForProxy = null;
-            DeleteMapping(_proxyMappingGuid);
+            DeleteMapping(ProxyMappingGuid);
             return;
         }
 
         _httpClientForProxy = HttpClientBuilder.Build(settings.ProxyAndRecordSettings);
 
-        var proxyRespondProvider = Given(Request.Create().WithPath("/*").UsingAnyMethod()).WithGuid(_proxyMappingGuid);
+        var proxyRespondProvider = Given(Request.Create().WithPath("/*").UsingAnyMethod()).WithGuid(ProxyMappingGuid).WithTitle("Default Proxy Mapping on /*");
         if (settings.StartAdminInterface == true)
         {
             proxyRespondProvider.AtPriority(WireMockConstants.ProxyPriority);
@@ -359,7 +358,7 @@ public partial class WireMockServer
         var mappingModel = DeserializeObject<MappingModel>(requestMessage);
         Guid? guidFromPut = ConvertMappingAndRegisterAsRespondProvider(mappingModel, guid);
 
-        return ResponseMessageBuilder.Create("Mapping added or updated", 200, guidFromPut);
+        return ResponseMessageBuilder.Create("Mapping added or updated", HttpStatusCode.OK, guidFromPut);
     }
 
     private IResponseMessage MappingDelete(IRequestMessage requestMessage)
@@ -368,13 +367,13 @@ public partial class WireMockServer
 
         if (DeleteMapping(guid))
         {
-            return ResponseMessageBuilder.Create("Mapping removed", 200, guid);
+            return ResponseMessageBuilder.Create("Mapping removed", HttpStatusCode.OK, guid);
         }
 
-        return ResponseMessageBuilder.Create("Mapping not found", 404);
+        return ResponseMessageBuilder.Create("Mapping not found", HttpStatusCode.NotFound);
     }
 
-    private Guid ParseGuidFromRequestMessage(IRequestMessage requestMessage)
+    private static Guid ParseGuidFromRequestMessage(IRequestMessage requestMessage)
     {
         return Guid.Parse(requestMessage.Path.Substring(AdminMappings.Length + 1));
     }

src/WireMock.Net/Server/WireMockServer.ImportWireMockOrg.cs

@@ -27,7 +27,7 @@ public partial class WireMockServer
 
         string filenameWithoutExtension = Path.GetFileNameWithoutExtension(path);
 
-        if (FileHelper.TryReadMappingFileWithRetryAndDelay(_settings.FileSystemHandler, path, out string value))
+        if (FileHelper.TryReadMappingFileWithRetryAndDelay(_settings.FileSystemHandler, path, out var value))
         {
             var mappings = DeserializeJsonToArray<OrgMappings>(value);
             foreach (var mapping in mappings)

src/WireMock.Net/Server/WireMockServer.cs

@@ -80,7 +80,7 @@ public partial class WireMockServer : IWireMockServer
     /// Gets the scenarios.
     /// </summary>
     [PublicAPI]
-    public ConcurrentDictionary<string, ScenarioState> Scenarios => new ConcurrentDictionary<string, ScenarioState>(_options.Scenarios);
+    public ConcurrentDictionary<string, ScenarioState> Scenarios => new(_options.Scenarios);
 
     #region IDisposable Members
     /// <summary>
@@ -414,10 +414,10 @@ public partial class WireMockServer : IWireMockServer
 
     /// <inheritdoc cref="IWireMockServer.SetAzureADAuthentication(string, string)" />
     [PublicAPI]
-    public void SetAzureADAuthentication([NotNull] string tenant, [NotNull] string audience)
+    public void SetAzureADAuthentication(string tenant, string audience)
     {
-        Guard.NotNull(tenant, nameof(tenant));
+        Guard.NotNull(tenant);
-        Guard.NotNull(audience, nameof(audience));
+        Guard.NotNull(audience);
 
 #if NETSTANDARD1_3
         throw new NotSupportedException("AzureADAuthentication is not supported for NETStandard 1.3");
@@ -445,14 +445,14 @@ public partial class WireMockServer : IWireMockServer
 
     /// <inheritdoc cref="IWireMockServer.SetMaxRequestLogCount" />
     [PublicAPI]
-    public void SetMaxRequestLogCount([CanBeNull] int? maxRequestLogCount)
+    public void SetMaxRequestLogCount(int? maxRequestLogCount)
     {
         _options.MaxRequestLogCount = maxRequestLogCount;
     }
 
     /// <inheritdoc cref="IWireMockServer.SetRequestLogExpirationDuration" />
     [PublicAPI]
-    public void SetRequestLogExpirationDuration([CanBeNull] int? requestLogExpirationDuration)
+    public void SetRequestLogExpirationDuration(int? requestLogExpirationDuration)
     {
         _options.RequestLogExpirationDuration = requestLogExpirationDuration;
     }
@@ -542,12 +542,12 @@ public partial class WireMockServer : IWireMockServer
         {
             if (!string.IsNullOrEmpty(settings.AdminUsername) && !string.IsNullOrEmpty(settings.AdminPassword))
             {
-                SetBasicAuthentication(settings.AdminUsername, settings.AdminPassword);
+                SetBasicAuthentication(settings.AdminUsername!, settings.AdminPassword!);
             }
 
             if (!string.IsNullOrEmpty(settings.AdminAzureADTenant) && !string.IsNullOrEmpty(settings.AdminAzureADAudience))
             {
-                SetAzureADAuthentication(settings.AdminAzureADTenant, settings.AdminAzureADAudience);
+                SetAzureADAuthentication(settings.AdminAzureADTenant!, settings.AdminAzureADAudience!);
             }
 
             InitAdmin();

src/WireMock.Net/Util/BytesEncodingUtils.cs

@@ -1,10 +1,11 @@
-using System;
+using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Text;
 
-namespace WireMock.Util
+namespace WireMock.Util;
-{
+
 /// <summary>
 /// Based on:
 /// http://utf8checker.codeplex.com
@@ -23,7 +24,7 @@ namespace WireMock.Util
     /// </summary>
     /// <param name="bytes">The bytes.</param>
     /// <param name="encoding">The output encoding.</param>
-        public static bool TryGetEncoding(byte[] bytes, out Encoding encoding)
+    public static bool TryGetEncoding(byte[] bytes, [NotNullWhen(true)] out Encoding? encoding)
     {
         encoding = null;
         if (bytes.All(b => b < 80))
@@ -227,4 +228,3 @@ namespace WireMock.Util
     }
 }
 #pragma warning restore S3776 // Cognitive Complexity of methods should not be too high
-}

src/WireMock.Net/Util/CompressionUtils.cs

@@ -1,16 +1,15 @@
-using System;
+using System;
 using System.IO;
 using System.IO.Compression;
 
-namespace WireMock.Util
+namespace WireMock.Util;
-{
+
 internal static class CompressionUtils
 {
     public static byte[] Compress(string contentEncoding, byte[] data)
     {
-            using (var compressedStream = new MemoryStream())
+        using var compressedStream = new MemoryStream();
-            using (var zipStream = Create(contentEncoding, compressedStream, CompressionMode.Compress))
+        using var zipStream = Create(contentEncoding, compressedStream, CompressionMode.Compress);
-            {
         zipStream.Write(data, 0, data.Length);
 
 #if !NETSTANDARD1_3
@@ -18,32 +17,23 @@ namespace WireMock.Util
 #endif
         return compressedStream.ToArray();
     }
-        }
 
     public static byte[] Decompress(string contentEncoding, byte[] data)
     {
-            using (var compressedStream = new MemoryStream(data))
+        using var compressedStream = new MemoryStream(data);
-            using (var zipStream = Create(contentEncoding, compressedStream, CompressionMode.Decompress))
+        using var zipStream = Create(contentEncoding, compressedStream, CompressionMode.Decompress);
-            using (var resultStream = new MemoryStream())
+        using var resultStream = new MemoryStream();
-            {
         zipStream.CopyTo(resultStream);
         return resultStream.ToArray();
     }
-        }
 
     private static Stream Create(string contentEncoding, Stream stream, CompressionMode mode)
     {
-            switch (contentEncoding)
+        return contentEncoding switch
         {
-                case "gzip":
+            "gzip" => new GZipStream(stream, mode),
-                    return new GZipStream(stream, mode);
+            "deflate" => new DeflateStream(stream, mode),
-
+            _ => throw new NotSupportedException($"ContentEncoding '{contentEncoding}' is not supported.")
-                case "deflate":
+        };
-                    return new DeflateStream(stream, mode);
-
-                default:
-                    throw new NotSupportedException($"ContentEncoding '{contentEncoding}' is not supported.");
-            }
-        }
     }
 }

src/WireMock.Net/Util/DictionaryExtensions.cs

@@ -1,10 +1,9 @@
-using System;
+using System;
 using System.Collections.Generic;
-using JetBrains.Annotations;
 using Stef.Validation;
 
-namespace WireMock.Util
+namespace WireMock.Util;
-{
+
 /// <summary>
 /// Some IDictionary Extensions
 /// </summary>
@@ -17,9 +16,9 @@ namespace WireMock.Util
     /// <typeparam name="TValue">The type of the value.</typeparam>
     /// <param name="dictionary">The dictionary to loop (can be null).</param>
     /// <param name="action">The action.</param>
-        public static void Loop<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, [NotNull] Action<TKey, TValue> action)
+    public static void Loop<TKey, TValue>(this IDictionary<TKey, TValue>? dictionary, Action<TKey, TValue> action)
     {
-            Guard.NotNull(action, nameof(action));
+        Guard.NotNull(action);
 
         if (dictionary != null)
         {
@@ -30,4 +29,3 @@ namespace WireMock.Util
         }
     }
 }
-}

src/WireMock.Net/Util/FileHelper.cs

@@ -1,19 +1,19 @@
-using JetBrains.Annotations;
+using System.Diagnostics.CodeAnalysis;
 using System.Threading;
-using WireMock.Handlers;
 using Stef.Validation;
+using WireMock.Handlers;
+
+namespace WireMock.Util;
 
-namespace WireMock.Util
-{
 internal static class FileHelper
 {
     private const int NumberOfRetries = 3;
     private const int DelayOnRetry = 500;
 
-        public static bool TryReadMappingFileWithRetryAndDelay([NotNull] IFileSystemHandler handler, [NotNull] string path, out string value)
+    public static bool TryReadMappingFileWithRetryAndDelay(IFileSystemHandler handler, string path, [NotNullWhen(true)] out string? value)
     {
-            Guard.NotNull(handler, nameof(handler));
+        Guard.NotNull(handler);
-            Guard.NotNullOrEmpty(path, nameof(path));
+        Guard.NotNullOrEmpty(path);
 
         value = null;
 
@@ -33,4 +33,3 @@ namespace WireMock.Util
         return false;
     }
 }
-}

src/WireMock.Net/Util/HttpStatusRangeParser.cs

@@ -1,10 +1,10 @@
-using System;
+using System;
 using System.Linq;
 using System.Net;
 using System.Text.RegularExpressions;
 
-namespace WireMock.Util
+namespace WireMock.Util;
-{
+
 /// <summary>
 /// Based on https://github.com/tmenier/Flurl/blob/129565361e135e639f1d44a35a78aea4302ac6ca/src/Flurl.Http/HttpStatusRangeParser.cs
 /// </summary>
@@ -47,7 +47,7 @@ namespace WireMock.Util
     /// <param name="pattern">The pattern. (Can be null, in that case it's allowed.)</param>
     /// <param name="httpStatusCode">The value.</param>
     /// <exception cref="ArgumentException"><paramref name="pattern"/> is invalid.</exception>
-        public static bool IsMatch(string pattern, int httpStatusCode)
+    public static bool IsMatch(string? pattern, int httpStatusCode)
     {
         if (pattern == null)
         {
@@ -88,4 +88,3 @@ namespace WireMock.Util
         return false;
     }
 }
-}

src/WireMock.Net/Util/PortUtils.cs

@@ -1,16 +1,17 @@
-using System;
+using System;
+using System.Diagnostics.CodeAnalysis;
 using System.Net;
 using System.Net.Sockets;
 using System.Text.RegularExpressions;
 
-namespace WireMock.Util
+namespace WireMock.Util;
-{
+
 /// <summary>
 /// Port Utility class
 /// </summary>
 public static class PortUtils
 {
-        private static readonly Regex UrlDetailsRegex = new Regex(@"^((?<proto>\w+)://)(?<host>[^/]+?):(?<port>\d+)\/?$", RegexOptions.Compiled);
+    private static readonly Regex UrlDetailsRegex = new(@"^((?<proto>\w+)://)(?<host>[^/]+?):(?<port>\d+)\/?$", RegexOptions.Compiled);
 
     /// <summary>
     /// Finds a free TCP port.
@@ -18,7 +19,7 @@ namespace WireMock.Util
     /// <remarks>see http://stackoverflow.com/questions/138043/find-the-next-tcp-port-in-net.</remarks>
     public static int FindFreeTcpPort()
     {
-            TcpListener tcpListener = null;
+        TcpListener? tcpListener = null;
         try
         {
             tcpListener = new TcpListener(IPAddress.Loopback, 0);
@@ -35,7 +36,7 @@ namespace WireMock.Util
     /// <summary>
     /// Extract the if-isHttps, protocol, host and port from a URL.
     /// </summary>
-        public static bool TryExtract(string url, out bool isHttps, out string protocol, out string host, out int port)
+    public static bool TryExtract(string url, out bool isHttps, [NotNullWhen(true)] out string? protocol, [NotNullWhen(true)] out string? host, out int port)
     {
         isHttps = false;
         protocol = null;
@@ -55,4 +56,3 @@ namespace WireMock.Util
         return false;
     }
 }
-}

src/WireMock.Net/Util/QueryStringParser.cs

@@ -1,11 +1,11 @@
-using System;
+using System;
 using System.Net;
 using System.Collections.Generic;
 using System.Linq;
 using WireMock.Types;
 
-namespace WireMock.Util
+namespace WireMock.Util;
-{
+
 /// <summary>
 /// Based on https://stackoverflow.com/questions/659887/get-url-parameters-from-a-string-in-net
 /// </summary>
@@ -35,4 +35,3 @@ namespace WireMock.Util
             .ToDictionary(grouping => grouping.Key, grouping => new WireMockList<string>(grouping.SelectMany(x => x).Select(WebUtility.UrlDecode)));
     }
 }
-}

src/WireMock.Net/Util/TypeBuilderUtils.cs

@@ -14,8 +14,8 @@ internal static class TypeBuilderUtils
 {
     private static readonly ConcurrentDictionary<IDictionary<string, Type>, Type> Types = new();
 
-    private static readonly ModuleBuilder ModuleBuilder =
+    private static readonly ModuleBuilder ModuleBuilder = AssemblyBuilder
-        AssemblyBuilder.DefineDynamicAssembly(new AssemblyName("WireMock.Net.Reflection"), AssemblyBuilderAccess.Run)
+            .DefineDynamicAssembly(new AssemblyName("WireMock.Net.Reflection"), AssemblyBuilderAccess.Run)
             .DefineDynamicModule("WireMock.Net.Reflection.Module");
 
     public static Type BuildType(IDictionary<string, Type> properties, string? name = null)

src/WireMock.Net/Util/UrlUtils.cs

@@ -1,5 +1,4 @@
-using System;
+using System;
-using JetBrains.Annotations;
 using WireMock.Models;
 using Stef.Validation;
 #if !USE_ASPNETCORE
@@ -8,13 +7,13 @@ using Microsoft.Owin;
 using Microsoft.AspNetCore.Http;
 #endif
 
-namespace WireMock.Util
+namespace WireMock.Util;
-{
+
 internal static class UrlUtils
 {
-        public static UrlDetails Parse([NotNull] Uri uri, PathString pathBase)
+    public static UrlDetails Parse(Uri uri, PathString pathBase)
     {
-            Guard.NotNull(uri, nameof(uri));
+        Guard.NotNull(uri);
 
         if (!pathBase.HasValue)
         {
@@ -38,4 +37,3 @@ namespace WireMock.Util
         return text.Substring(0, pos) + text.Substring(pos + search.Length);
     }
 }
-}

test/WireMock.Net.Tests/Owin/MappingMatcherTests.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using FluentAssertions;
 using Moq;
@@ -9,8 +9,8 @@ using WireMock.Owin;
 using WireMock.Util;
 using Xunit;
 
-namespace WireMock.Net.Tests.Owin
+namespace WireMock.Net.Tests.Owin;
-{
+
 public class MappingMatcherTests
 {
     private readonly Mock<IWireMockMiddlewareOptions> _optionsMock;
@@ -74,7 +74,8 @@ namespace WireMock.Net.Tests.Owin
         // Assign
         var guid1 = Guid.Parse("00000000-0000-0000-0000-000000000001");
         var guid2 = Guid.Parse("00000000-0000-0000-0000-000000000002");
-            var mappings = InitMappings(
+        var mappings = InitMappings
+        (
             (guid1, new[] { 0.1 }),
             (guid2, new[] { 1.0 })
         );
@@ -86,19 +87,23 @@ namespace WireMock.Net.Tests.Owin
         var result = _sut.FindBestMatch(request);
 
         // Assert
-            result.Match.Mapping.Guid.Should().Be(guid2);
+        result.Match.Should().NotBeNull();
+        result.Match!.Mapping.Guid.Should().Be(guid2);
         result.Match.RequestMatchResult.AverageTotalScore.Should().Be(1.0);
-            result.Partial.Mapping.Guid.Should().Be(guid2);
+
+        result.Partial.Should().NotBeNull();
+        result.Partial!.Mapping.Guid.Should().Be(guid2);
         result.Partial.RequestMatchResult.AverageTotalScore.Should().Be(1.0);
     }
 
     [Fact]
-        public void MappingMatcher_FindBestMatch_WhenAllowPartialMappingIsFalse_AndNoExactmatch_ShouldReturnNullExactMatch_And_PartialMatch()
+    public void MappingMatcher_FindBestMatch_WhenAllowPartialMappingIsFalse_AndNoExactMatch_ShouldReturnNullExactMatch_And_PartialMatch()
     {
         // Assign
         var guid1 = Guid.Parse("00000000-0000-0000-0000-000000000001");
         var guid2 = Guid.Parse("00000000-0000-0000-0000-000000000002");
-            var mappings = InitMappings(
+        var mappings = InitMappings
+        (
             (guid1, new[] { 0.1 }),
             (guid2, new[] { 0.9 })
         );
@@ -111,7 +116,9 @@ namespace WireMock.Net.Tests.Owin
 
         // Assert
         result.Match.Should().BeNull();
-            result.Partial.Mapping.Guid.Should().Be(guid2);
+
+        result.Partial.Should().NotBeNull();
+        result.Partial!.Mapping.Guid.Should().Be(guid2);
         result.Partial.RequestMatchResult.AverageTotalScore.Should().Be(0.9);
     }
 
@@ -135,9 +142,12 @@ namespace WireMock.Net.Tests.Owin
         var result = _sut.FindBestMatch(request);
 
         // Assert
-            result.Match.Mapping.Guid.Should().Be(guid2);
+        result.Match.Should().NotBeNull();
+        result.Match!.Mapping.Guid.Should().Be(guid2);
         result.Match.RequestMatchResult.AverageTotalScore.Should().Be(0.9);
-            result.Partial.Mapping.Guid.Should().Be(guid2);
+
+        result.Partial.Should().NotBeNull();
+        result.Partial!.Mapping.Guid.Should().Be(guid2);
         result.Partial.RequestMatchResult.AverageTotalScore.Should().Be(0.9);
     }
 
@@ -159,13 +169,16 @@ namespace WireMock.Net.Tests.Owin
         var result = _sut.FindBestMatch(request);
 
         // Assert and Verify
-            result.Match.Mapping.Guid.Should().Be(guid2);
+        result.Match.Should().NotBeNull();
+        result.Match!.Mapping.Guid.Should().Be(guid2);
         result.Match.RequestMatchResult.AverageTotalScore.Should().Be(1.0);
-            result.Partial.Mapping.Guid.Should().Be(guid2);
+
+        result.Partial.Should().NotBeNull();
+        result.Partial!.Mapping.Guid.Should().Be(guid2);
         result.Partial.RequestMatchResult.AverageTotalScore.Should().Be(1.0);
     }
 
-        private ConcurrentDictionary<Guid, IMapping> InitMappings(params (Guid guid, double[] scores)[] matches)
+    private static ConcurrentDictionary<Guid, IMapping> InitMappings(params (Guid guid, double[] scores)[] matches)
     {
         var mappings = new ConcurrentDictionary<Guid, IMapping>();
 
@@ -188,4 +201,3 @@ namespace WireMock.Net.Tests.Owin
         return mappings;
     }
 }
-}

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

@@ -1,12 +1,12 @@
-using FluentAssertions;
+using FluentAssertions;
 using Moq;
 using System;
 using WireMock.Handlers;
 using WireMock.Util;
 using Xunit;
 
-namespace WireMock.Net.Tests.Util
+namespace WireMock.Net.Tests.Util;
-{
+
 public class FileHelperTests
 {
     [Fact]
@@ -17,7 +17,7 @@ namespace WireMock.Net.Tests.Util
         staticMappingHandlerMock.Setup(m => m.ReadMappingFile(It.IsAny<string>())).Returns("text");
 
         // Act
-            bool result = FileHelper.TryReadMappingFileWithRetryAndDelay(staticMappingHandlerMock.Object, @"c:\temp", out string value);
+        bool result = FileHelper.TryReadMappingFileWithRetryAndDelay(staticMappingHandlerMock.Object, @"c:\temp", out var value);
 
         // Assert
         result.Should().BeTrue();
@@ -35,7 +35,7 @@ namespace WireMock.Net.Tests.Util
         staticMappingHandlerMock.Setup(m => m.ReadMappingFile(It.IsAny<string>())).Throws<NotSupportedException>();
 
         // Act
-            bool result = FileHelper.TryReadMappingFileWithRetryAndDelay(staticMappingHandlerMock.Object, @"c:\temp", out string value);
+        bool result = FileHelper.TryReadMappingFileWithRetryAndDelay(staticMappingHandlerMock.Object, @"c:\temp", out var value);
 
         // Assert
         result.Should().BeFalse();
@@ -45,4 +45,3 @@ namespace WireMock.Net.Tests.Util
         staticMappingHandlerMock.Verify(m => m.ReadMappingFile(@"c:\temp"), Times.Exactly(3));
     }
 }
-}

test/WireMock.Net.Tests/WireMockServer.Proxy.cs

@@ -18,8 +18,8 @@ using WireMock.Settings;
 using WireMock.Util;
 using Xunit;
 
-namespace WireMock.Net.Tests
+namespace WireMock.Net.Tests;
-{
+
 public class WireMockServerProxyTests
 {
     [Fact(Skip = "Fails in Linux CI")]
@@ -54,7 +54,7 @@ namespace WireMock.Net.Tests
     }
 
     [Fact]
-        public async Task WireMockServer_Proxy_With_SaveMapping_Is_True_And_SaveMappingToFile_Is_False_Should_AddInternalMappingOnly()
+    public async Task WireMockServer_Proxy_AdminFalse_With_SaveMapping_Is_True_And_SaveMappingToFile_Is_False_Should_AddInternalMappingOnly()
     {
         // Assign
         var settings = new WireMockServerSettings
@@ -63,24 +63,62 @@ namespace WireMock.Net.Tests
             {
                 Url = "http://www.google.com",
                 SaveMapping = true,
-                    SaveMappingToFile = false
+                SaveMappingToFile = false,
+                ExcludedHeaders = new[] { "Connection" } // Needed for .NET 4.5.x and 4.6.x
             }
         };
         var server = WireMockServer.Start(settings);
 
         // Act
+        var httpClientHandler = new HttpClientHandler { AllowAutoRedirect = false };
+        var client = new HttpClient(httpClientHandler);
+        for (int i = 0; i < 5; i++)
+        {
             var requestMessage = new HttpRequestMessage
             {
                 Method = HttpMethod.Get,
-                RequestUri = new Uri(server.Urls[0])
+                RequestUri = new Uri(server.Url!)
             };
-            var httpClientHandler = new HttpClientHandler { AllowAutoRedirect = false };
+            await client.SendAsync(requestMessage).ConfigureAwait(false);
-            await new HttpClient(httpClientHandler).SendAsync(requestMessage).ConfigureAwait(false);
+        }
 
         // Assert
         server.Mappings.Should().HaveCount(2);
     }
 
+    [Fact]
+    public async Task WireMockServer_Proxy_AdminTrue_With_SaveMapping_Is_True_And_SaveMappingToFile_Is_False_Should_AddInternalMappingOnly()
+    {
+        // Assign
+        var settings = new WireMockServerSettings
+        {
+            ProxyAndRecordSettings = new ProxyAndRecordSettings
+            {
+                Url = "http://www.google.com",
+                SaveMapping = true,
+                SaveMappingToFile = false,
+                ExcludedHeaders = new[] { "Connection" } // Needed for .NET 4.5.x and 4.6.x
+            },
+            StartAdminInterface = true
+        };
+        var server = WireMockServer.Start(settings);
+
+        // Act
+        for (int i = 0; i < 5; i++)
+        {
+            var requestMessage = new HttpRequestMessage
+            {
+                Method = HttpMethod.Get,
+                RequestUri = new Uri(server.Url!)
+            };
+            var httpClientHandler = new HttpClientHandler { AllowAutoRedirect = false };
+            await new HttpClient(httpClientHandler).SendAsync(requestMessage).ConfigureAwait(false);
+        }
+
+        // Assert
+        server.Mappings.Should().HaveCount(28);
+    }
+
     [Fact]
     public async Task WireMockServer_Proxy_With_SaveMapping_Is_False_And_SaveMappingToFile_Is_True_ShouldSaveMappingToFile()
     {
@@ -264,7 +302,7 @@ namespace WireMock.Net.Tests
             {
                 BodyData = new BodyData
                 {
-                        BodyAsString = x.Headers["Authorization"].ToString(),
+                    BodyAsString = x.Headers!["Authorization"].ToString(),
                     DetectedBodyType = Types.BodyType.String
                 }
             }));
@@ -294,7 +332,7 @@ namespace WireMock.Net.Tests
         (await result.Content.ReadAsStringAsync().ConfigureAwait(false)).Should().Be("BASIC test-A");
 
         var receivedRequest = serverForProxyForwarding.LogEntries.First().RequestMessage;
-            var authorizationHeader = receivedRequest.Headers["Authorization"].ToString().Should().Be("BASIC test-A");
+        receivedRequest.Headers!["Authorization"].ToString().Should().Be("BASIC test-A");
 
         server.Mappings.Should().HaveCount(2);
         var authorizationRequestMessageHeaderMatcher = ((Request)server.Mappings.Single(m => !m.IsAdminInterface).RequestMatcher)
@@ -702,4 +740,3 @@ namespace WireMock.Net.Tests
         server.Stop();
     }
 }
-}