Fix reverse proxy not compressing responses as expected

API/Protocol/ContentType.cs

@@ -389,7 +389,7 @@ public static FlexibleContentType Parse(string header)
 
                 if (charsetIndex > 0)
                 {
-                    return Get(contentType, span[charsetIndex..].Trim().ToString());
+                    return Get(contentType, span[(charsetIndex + 1)..].Trim().ToString());
                 }
                 else
                 {

Modules/Basics/CoreExtensions.cs

@@ -64,7 +64,7 @@ public static bool HasType(this IRequest request, params RequestMethod[] methods
         /// Specifies the content type of this response.
         /// </summary>
         /// <param name="contentType">The content type of this response</param>
-        public static IResponseBuilder Type(this IResponseBuilder builder, string contentType) => builder.Type(FlexibleContentType.Get(contentType));
+        public static IResponseBuilder Type(this IResponseBuilder builder, string contentType) => builder.Type(FlexibleContentType.Parse(contentType));
 
         #endregion
 

Testing/Engine/CompressionTests.cs

@@ -161,6 +161,27 @@ public async Task TestVariyHeaderExtendedAdded()
             Assert.IsTrue(response.Headers.Vary.Contains("Accept-Encoding"));
         }
 
+        [TestMethod]
+        public async Task TestContentType()
+        {
+            var handler = new FunctionalHandler(responseProvider: (r) =>
+            {
+                return r.Respond()
+                        .Content(Resource.FromString("Hello World").Build())
+                        .Type("application/json; charset=utf-8")
+                        .Build();
+            });
+
+            using var runner = TestRunner.Run(handler.Wrap());
+
+            var request = runner.GetRequest();
+            request.Headers.Add("Accept-Encoding", "gzip, deflate, br");
+
+            using var response = await runner.GetResponse(request);
+
+            Assert.AreEqual("br", response.Content.Headers.ContentEncoding.First());
+        }
+
     }
 
 }

Testing/Modules/ReverseProxyTests.cs

@@ -2,6 +2,7 @@
 using System.IO;
 using System.Collections.Generic;
 using System.Net;
+using System.Net.Http;
 using System.Threading.Tasks;
 using System.Linq;
 
@@ -11,11 +12,11 @@
 using GenHTTP.Api.Protocol;
 
 using GenHTTP.Modules.IO;
+using GenHTTP.Modules.Practices;
 using GenHTTP.Modules.ReverseProxy;
 using GenHTTP.Modules.Layouting;
 
 using Cookie = GenHTTP.Api.Protocol.Cookie;
-using System.Net.Http;
 
 namespace GenHTTP.Testing.Acceptance.Providers
 {
@@ -57,6 +58,7 @@ public static TestSetup Create(Func<IRequest, IResponse?> response)
 
                 runner.Host.Handler(proxy)
                            .Development()
+                           .Defaults()
                            .Start();
 
                 return new TestSetup(runner, testServer);
@@ -400,6 +402,26 @@ public async Task TestBadGateway()
             Assert.AreEqual(HttpStatusCode.BadGateway, response.StatusCode);
         }
 
+
+        [TestMethod]
+        public async Task TestCompression()
+        {
+            using var setup = TestSetup.Create((r) =>
+            {
+                return r.Respond().Content("Hello World!").Build();
+            });
+
+            var runner = setup.Runner;
+
+            var request = runner.GetRequest();
+
+            request.Headers.Add("Accept-Encoding", "br, gzip, deflate");
+
+            using var response = await runner.GetResponse(request);
+
+            Assert.AreEqual("br", response.GetContentHeader("Content-Encoding"));
+        }
+
     }
 
 }