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Strip duplicate Server header in session-server proxy #13

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Merged
odp merged 1 commit into from
May 6, 2026
Merged

Strip duplicate Server header in session-server proxy #13

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5 changes: 4 additions & 1 deletion miles/rollout/session/session_server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -86,10 +86,13 @@ def build_proxy_response(self, result: dict) -> Response:
# verbatim breaks uvicorn h11 with "Too much data for declared
# Content-Length" whenever our re-serialization differs in even one
# byte. Mirrors the strip already done on the request path in do_proxy.
# Also strip "server": uvicorn adds its own Server header; passing
# the upstream one through produces two Server headers, which strict
# HTTP parsers (aiohttp/llhttp via litellm) reject as malformed.
headers = {
k: v
for k, v in result["headers"].items()
if k.lower() not in ("content-length", "transfer-encoding")
if k.lower() not in ("content-length", "transfer-encoding", "server")
}
content_type = headers.get("content-type", "")
try:
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