Request uncompressed responses from remote MCP servers#1399
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RhysSullivan wants to merge 2 commits into
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Request uncompressed responses from remote MCP servers#1399RhysSullivan wants to merge 2 commits into
RhysSullivan wants to merge 2 commits into
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Some remote MCP servers miscompute Content-Length on gzipped responses (set to the uncompressed size), which truncates the stream and fails the handshake with an opaque decompression error in runtimes that send a default Accept-Encoding. Send accept-encoding: identity on the remote transports and the shape probe (a caller-supplied header still wins); MCP payloads are small, so compression buys nothing. Also stop masking the streamable-http failure when the auto-transport SSE fallback fails too: most servers never supported legacy SSE, so reporting only the fallback's error hid the real cause.
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Connecting to some remote MCP servers failed with "Failed connecting via sse". The server returns gzipped responses with a miscomputed Content-Length (the uncompressed size), so the stream is truncated and the streamable-http handshake fails with a decompression error; the auto-transport SSE fallback then fails too (the server never supported legacy SSE) and its error masked the real one.
This sends
accept-encoding: identityon remote MCP transports and the shape probe, matching what other MCP clients do (a caller-supplied Accept-Encoding header still wins), and includes both transport failures in the error message when the auto fallback also fails.