Option to disable JSON deserialization (#434)

* Option to disable JSON deserialization

* Fix build errors, add test case

* make new parameter optional

* set default for contentType as well

src/WireMock.Net/Owin/IWireMockMiddlewareOptions.cs

@@ -41,5 +41,7 @@ namespace WireMock.Owin
         bool? AllowBodyForAllHttpMethods { get; set; }
 
         bool? AllowAnyHttpStatusCodeInResponse { get; set; }
+
+        bool? DisableJsonBodyParsing { get; set; }
     }
 }

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

@@ -49,7 +49,7 @@ namespace WireMock.Owin.Mappers
             BodyData body = null;
             if (request.Body != null && BodyParser.ShouldParseBody(method, options.AllowBodyForAllHttpMethods == true))
             {
-                body = await BodyParser.Parse(request.Body, request.ContentType);
+                body = await BodyParser.Parse(request.Body, request.ContentType, !options.DisableJsonBodyParsing.GetValueOrDefault(false));
             }
 
             return new RequestMessage(urldetails, method, clientIP, body, headers, cookies) { DateTime = DateTime.UtcNow };

src/WireMock.Net/Owin/WireMockMiddlewareOptions.cs

@@ -45,5 +45,8 @@ namespace WireMock.Owin
 
         /// <inheritdoc cref="IWireMockMiddlewareOptions.AllowAnyHttpStatusCodeInResponse"/>
         public bool? AllowAnyHttpStatusCodeInResponse { get; set; }
+
+        /// <inheritdoc cref="IWireMockMiddlewareOptions.DisableResponseBodyParsing"/>
+        public bool? DisableJsonBodyParsing { get; set; }
     }
 }