Unverified50% confidenceSolutionExact time
When calling an MCP server that uses the Streamable HTTP transport, the HTTP request's Accept header must include both application/json and text/event-stream, otherwise the server returns 406.
1
Sources
50%
Confidence
Long-term
Relevance
10/18/2026
First Seen
Sources
Related Entities
Related Claims
VerifiedRemote MCP services adopt the Streamable HTTP mode, based on HTTP/1.1 or HTTP/2 protocols, with support for Server-Sent Events (SSE).74% similarUnverifiedWhen configuring the MCP server in Codex, the connection method should be set to Streamable HTTP, and the address should be filled in with the address corresponding to the plugin (default port 23120).73% similarUnverifiedAnswerLine has launched a hosted MCP server, with the server address https://mcp.answerline.dev/mcp, using the streamable HTTP protocol and authenticating via Bearer Token.71% similarUnverifiedIn the OAuth flow, the MCP server returns a 401 Unauthorized response to requests without a valid token, along with a login URL pointing to the authorization server.70% similar
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