Add Settings.QueryParameterMultipleValueSupport (#836)

* QueryParameterMultipleValueSupport

* .

* ,

* ,

src/WireMock.Net.Abstractions/Admin/Settings/SettingsModel.cs

@@ -89,4 +89,11 @@ public class SettingsModel
     /// Don't save the response-string in the LogEntry when WithBody(Func{IRequestMessage, string}) or WithBody(Func{IRequestMessage, Task{string}}) is used. (default set to false).
     /// </summary>
     public bool? DoNotSaveDynamicResponseInLogEntry { get; set; }
+
+    /// <summary>
+    /// See <seealso cref="QueryParameterMultipleValueSupport"/>.
+    ///
+    /// Default value = "All".
+    /// </summary>
+    public QueryParameterMultipleValueSupport? QueryParameterMultipleValueSupport { get; set; }
 }

src/WireMock.Net.Abstractions/IRequestMessage.cs

@@ -28,7 +28,7 @@ public interface IRequestMessage
     /// <summary>
     /// The ProxyUrl (if a proxy is used).
     /// </summary>
-    string ProxyUrl { get; set; }
+    string? ProxyUrl { get; set; }
 
     /// <summary>
     /// Gets the DateTime.

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

@@ -0,0 +1,28 @@
+using System;
+
+namespace WireMock.Types;
+
+[Flags]
+public enum QueryParameterMultipleValueSupport
+{
+    // Support none
+    None = 0x0,
+
+    // Support "&" as multi-value-separator --> "key=value&key=anotherValue"
+    Ampersand = 0x1,
+
+    // Support ";" as multi-value-separator --> "key=value;key=anotherValue"
+    SemiColon = 0x2,
+
+    // Support "," as multi-value-separator -->  "key=1,2"
+    Comma = 0x4,
+
+    // Support "&" and ";" as multi-value-separator --> "key=value&key=anotherValue" and also "key=value;key=anotherValue"
+    AmpersandAndSemiColon = Ampersand | SemiColon,
+
+    // Support "&" and ";" as multi-value-separator
+    NoComma = AmpersandAndSemiColon,
+
+    // Support all multi-value-separators ("&" and ";" and ",")
+    All = Ampersand | SemiColon | Comma
+}