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fix(mcp): harden remote SSE fallback (#2324)

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* fix(mcp): harden remote SSE fallback

* fix(mcp): preserve transport errors during fallback

---------

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>
This commit is contained in:
Guanchao Wang
2026-07-11 22:08:37 +08:00
committed by GitHub
parent 940234a0d8
commit 2a3f7f8059
3 changed files with 355 additions and 18 deletions
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tests/unit_tests/provider/test_mcp_resources.py
+45
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@@ -4,6 +4,7 @@ import base64
from types import SimpleNamespace
from unittest.mock import AsyncMock, Mock
import httpx
import pytest
from mcp import types as mcp_types
@@ -54,6 +55,50 @@ def _query() -> SimpleNamespace:
return SimpleNamespace(variables={})
def _http_status_error(status_code: int) -> httpx.HTTPStatusError:
request = httpx.Request('POST', 'https://example.com/mcp')
response = httpx.Response(status_code, request=request)
return httpx.HTTPStatusError(f'HTTP {status_code}', request=request, response=response)
@pytest.mark.asyncio
async def test_remote_transport_falls_back_to_sse_for_compatible_http_status_in_exception_group():
session = RuntimeMCPSession(
'remote',
{'uuid': 'srv-1', 'mode': 'remote', 'url': 'https://example.com/mcp'},
True,
_app(),
)
session._init_streamable_http_server = AsyncMock(
side_effect=ExceptionGroup('transport failed', [_http_status_error(405)])
)
session._init_sse_server = AsyncMock()
await session._init_remote_server()
session._init_streamable_http_server.assert_awaited_once()
session._init_sse_server.assert_awaited_once()
@pytest.mark.asyncio
async def test_remote_transport_does_not_fallback_for_auth_http_status():
session = RuntimeMCPSession(
'remote',
{'uuid': 'srv-1', 'mode': 'remote', 'url': 'https://example.com/mcp'},
True,
_app(),
)
error = _http_status_error(403)
session._init_streamable_http_server = AsyncMock(side_effect=error)
session._init_sse_server = AsyncMock()
with pytest.raises(httpx.HTTPStatusError):
await session._init_remote_server()
session._init_streamable_http_server.assert_awaited_once()
session._init_sse_server.assert_not_awaited()
@pytest.mark.asyncio
async def test_read_resource_envelope_truncates_caches_and_records_trace():
session = _connected_session()