From a834f3cf9acd0b79181cdb9a95ebe36755194ecc Mon Sep 17 00:00:00 2001
From: Riley Norton <46510750+RileyNorton@users.noreply.github.com>
Date: Wed, 13 Aug 2025 14:12:13 -0700
Subject: [PATCH] mcp: allow correct 'Accept' header values

Allow other header values for the 'Accept' header that imply
application/json and text/event-stream for requests to the Streamable
HTTP Transport.

Fixes #290

Unit tests here seemed like unnecessary complexity and wouldn't fit
cleanly with the style of the `streamable_test.go` tests. Happy to add
those if desired though.
---
 mcp/streamable.go | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mcp/streamable.go b/mcp/streamable.go
index 048b99a..0d417bc 100644
--- a/mcp/streamable.go
+++ b/mcp/streamable.go
@@ -98,9 +98,12 @@ func (h *StreamableHTTPHandler) ServeHTTP(w http.ResponseWriter, req *http.Reque
 	var jsonOK, streamOK bool
 	for _, c := range accept {
 		switch strings.TrimSpace(c) {
-		case "application/json":
+		case "application/json", "application/*":
+			jsonOK = true
+		case "text/event-stream", "text/*":
+			streamOK = true
+		case "*/*":
 			jsonOK = true
-		case "text/event-stream":
 			streamOK = true
 		}
 	}