mcp: export jsonResponse field

Exporting StreamableHTTPOptions.JSONResponse is helpful for some users behind proxies that don't work well with text/event-stream.

For #211

Co-authored-by: ccpro10 <co1797249167@gmail.com>

mcp/streamable.go

@@ -72,8 +72,8 @@ type StreamableHTTPOptions struct {
 
 	// TODO: support session retention (?)
 
-	// jsonResponse is forwarded to StreamableServerTransport.jsonResponse.
-	jsonResponse bool
+	// JSONResponse is forwarded to StreamableServerTransport.jsonResponse.
+	JSONResponse bool
 }
 
 // NewStreamableHTTPHandler returns a new [StreamableHTTPHandler].
@@ -233,7 +233,7 @@ func (h *StreamableHTTPHandler) ServeHTTP(w http.ResponseWriter, req *http.Reque
 		transport = &StreamableServerTransport{
 			SessionID:    sessionID,
 			Stateless:    h.opts.Stateless,
-			jsonResponse: h.opts.jsonResponse,
+			jsonResponse: h.opts.JSONResponse,
 		}
 
 		// To support stateless mode, we initialize the session with a default
@@ -487,7 +487,7 @@ type stream struct {
 	// jsonResponse records whether this stream should respond with application/json
 	// instead of text/event-stream.
 	//
-	// See [StreamableServerTransportOptions.jsonResponse].
+	// See [StreamableServerTransportOptions.JSONResponse].
 	jsonResponse bool
 
 	// signal is a 1-buffered channel, owned by an incoming HTTP request, that signals

mcp/streamable_test.go

@@ -84,7 +84,7 @@ func TestStreamableTransports(t *testing.T) {
 			// Start an httptest.Server with the StreamableHTTPHandler, wrapped in a
 			// cookie-checking middleware.
 			handler := NewStreamableHTTPHandler(func(req *http.Request) *Server { return server }, &StreamableHTTPOptions{
-				jsonResponse: useJSON,
+				JSONResponse: useJSON,
 			})
 
 			var (