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fix(mcp): preserve www-authenticate header on HTTPException, filter # from server name

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- Forward e.headers to JSONResponse in HTTPException handlers (handle_streamable_http_mcp, handle_sse_mcp) so OAuth2 www-authenticate header is preserved per RFC 9728
- Filter fragment identifier (#) from path segment when extracting server name to avoid misleading 404

Made-with: Cursor
This commit is contained in:
shivam 2026-03-12 16:59:32 -07:00
parent 7b234ebfd6
commit 0842186202
1 changed files with 5 additions and 1 deletions
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6
litellm/proxy/_experimental/mcp_server/server.py
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@ -2240,7 +2240,7 @@ if MCP_AVAILABLE:
# Child app receives path like /undefined when mounted at /mcp
# Extract first path segment as server name
segments = path.strip("/").split("/")
if segments and segments[0] and "?" not in segments[0]:
if segments and segments[0] and "?" not in segments[0] and "#" not in segments[0]:
mcp_servers_from_path = [segments[0]]
return mcp_servers_from_path
@ -2464,9 +2464,11 @@ if MCP_AVAILABLE:
content = {"error": detail}
else:
content = {"error": {"message": str(detail)}}
headers = dict(e.headers) if e.headers else {}
error_response = JSONResponse(
status_code=e.status_code,
content=content,
headers=headers,
)
await error_response(scope, receive, send)
except Exception:
@ -2554,9 +2556,11 @@ if MCP_AVAILABLE:
content = {"error": detail}
else:
content = {"error": {"message": str(detail)}}
headers = dict(e.headers) if e.headers else {}
error_response = JSONResponse(
status_code=e.status_code,
content=content,
headers=headers,
)
await error_response(scope, receive, send)
except Exception: