Update routing for streamable HTTP to avoid 307 redirect #1115
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yurikunash
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ihrpr
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Jul 11, 2025
ihrpr
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Jul 11, 2025
This was referenced Jul 11, 2025
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Thank you for looking into the PR @ihrpr |
jimsantora
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- Updated import from `fastmcp` to `mcp.server.fastmcp` - Changed requirements.txt to use mcp==1.12.2 instead of fastmcp>=2.10.0 - Updated transport to streamable-http with proper environment configuration - Added FASTMCP_HOST=0.0.0.0 environment variable in Helm deployment This migration avoids the HTTP redirect bug documented in: modelcontextprotocol/python-sdk#1115 that was not fixed in fastmcp 2.0. The official SDK provides better control over HTTP routing and eliminates automatic redirect behavior. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
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saqadri
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…tprotocol#1115) Co-authored-by: ihrpr <[email protected]>
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Setup the endpoint for the streamable HTTP (
/mcp) in the routing table as a route served by an ASGI app, instead of mounting it as a base path.Resolves: #732
As mentioned in MCP specification (version 2025-06-18):
This also aligns with JSON-RPC specification.
Motivation and Context
The change is required to avoid a 307 Temporary Redirect, from
/mcpto/mcp/endpoint, which currently happens. The redirect causes issues for several popular clients and also impedes hosting MCP servers behind proxy servers.How Has This Been Tested?
Tested locally and on a remote server with MCP clients.
Breaking Changes
The users who have MCP clients configured to consume the endpoint with a slash, e.g.
/mcp/, will start experiencing a 307 Temporary redirect to the endpoint without the slash/mcp.Types of changes
Checklist
Additional context