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fix: handle HTTP error status codes in streamable HTTP client (#2047)

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Marcelo Trylesinski 2026-02-14 09:49:42 +01:00 • committed by GitHub
commit 2fe56e56de
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1 changed files with 60 additions and 1 deletions
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9
src/mcp/client/streamable_http.py
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@ -19,6 +19,7 @@ from mcp.client._transport import TransportStreams
from mcp.shared._httpx_utils import create_mcp_http_client
from mcp.shared.message import ClientMessageMetadata, SessionMessage
from mcp.types import (
INTERNAL_ERROR,
INVALID_REQUEST,
PARSE_ERROR,
ErrorData,
@ -273,7 +274,13 @@ class StreamableHTTPTransport:
await ctx.read_stream_writer.send(session_message)
return
response.raise_for_status()
if response.status_code >= 400:
if isinstance(message, JSONRPCRequest):
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
if is_initialization:
self._maybe_extract_session_id_from_response(response)