Reworked Transport Formatters and Parsers (#8491)

Author: michaelstaib

src/HotChocolate/AspNetCore/src/AspNetCore.Pipeline/Formatters/DefaultHttpResponseFormatter.cs

@@ -157,7 +157,7 @@ protected virtual RequestFlags CreateRequestFlags(
             flags |= RequestFlags.AllowStreams;
         }
 
-        if (acceptMediaType.Kind is EventStream or All)
+        if (acceptMediaType.Kind is ApplicationGraphQLStream or EventStream or ApplicationJsonLines or All)
         {
             flags = RequestFlags.AllowAll;
         }
@@ -443,7 +443,10 @@ protected virtual HttpStatusCode OnDetermineStatusCode(
         // if we are sending a response stream with the multipart/mixed header or
         // with a text/event-stream response content-type, we as well will just
         // respond with an OK status code.
-        if (format.Kind is ResponseContentType.MultiPartMixed or ResponseContentType.EventStream)
+        if (format.Kind is ResponseContentType.MultiPartMixed
+            or ResponseContentType.EventStream
+            or ResponseContentType.GraphQLResponseStream
+            or ResponseContentType.JsonLines)
         {
             return HttpStatusCode.OK;
         }

src/HotChocolate/AspNetCore/src/AspNetCore.Pipeline/HttpPostMiddlewareBase.cs

@@ -56,7 +56,7 @@ protected async Task HandleRequestAsync(HttpContext context, ExecutorSession ses
         // with a 400 Bad Request.
         if (headerResult.HasError)
         {
-            // in this case accept headers were specified and we will
+            // in this case accept headers were specified, and we will
             // respond with proper error codes
             acceptMediaTypes = HeaderUtilities.GraphQLResponseContentTypes;
             statusCode = HttpStatusCode.BadRequest;
@@ -73,7 +73,7 @@ protected async Task HandleRequestAsync(HttpContext context, ExecutorSession ses
         // media type then we will fail the request with 406 Not Acceptable.
         if (requestFlags is None)
         {
-            // in this case accept headers were specified and we will
+            // in this case accept headers were specified, and we will
             // respond with proper error codes
             acceptMediaTypes = HeaderUtilities.GraphQLResponseContentTypes;
             statusCode = HttpStatusCode.NotAcceptable;

src/HotChocolate/AspNetCore/src/Transport.Abstractions/ContentType.cs

@@ -19,4 +19,9 @@ public static class ContentType
     /// Gets the text/event-stream content type.
     /// </summary>
     public const string EventStream = "text/event-stream";
+
+    /// <summary>
+    /// Gets the application/graphql-response+jsonl content type.
+    /// </summary>
+    public const string GraphQLJsonLine = "application/graphql-response+jsonl";
 }