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Server-side 2026-07-28 stateless support: classifier, driver split, server/discover (#2928)

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Max 2026-06-21 19:34:17 +01:00 • committed by GitHub
commit 2397319a68
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1 changed files with 2256 additions and 1088 deletions
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29
src/mcp/client/streamable_http.py
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@ -314,16 +314,29 @@ class StreamableHTTPTransport:
logger.debug("Received 202 Accepted")
return
if response.status_code == 404:
if isinstance(message, JSONRPCRequest):
error_data = ErrorData(code=INVALID_REQUEST, message="Session terminated")
session_message = SessionMessage(JSONRPCError(jsonrpc="2.0", id=message.id, error=error_data))
await ctx.read_stream_writer.send(session_message)
return
if response.status_code >= 400:
if isinstance(message, JSONRPCRequest):
error_data = ErrorData(code=INTERNAL_ERROR, message="Server returned an error response")
# A spec-correct server may return the JSON-RPC error in the
# body at a non-2xx status (e.g. 400 for INVALID_PARAMS, 404
# for METHOD_NOT_FOUND). Surface that error rather than the
# status-derived stand-in below.
if response.headers.get("content-type", "").lower().startswith("application/json"):
try:
body = await response.aread()
parsed = jsonrpc_message_adapter.validate_json(body, by_name=False)
if isinstance(parsed, JSONRPCError):
# The server may have set `id: null` (request rejected before its
# id was parsed); use this request's id so correlation works.
reply = JSONRPCError(jsonrpc="2.0", id=message.id, error=parsed.error)
await ctx.read_stream_writer.send(SessionMessage(reply))
return
except (httpx.StreamError, ValidationError):
pass
logger.debug("Non-2xx body was not a JSON-RPC error; using fallback")
if response.status_code == 404:
error_data = ErrorData(code=INVALID_REQUEST, message="Session terminated")
else:
error_data = ErrorData(code=INTERNAL_ERROR, message="Server returned an error response")
session_message = SessionMessage(JSONRPCError(jsonrpc="2.0", id=message.id, error=error_data))
await ctx.read_stream_writer.send(session_message)
return