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First end-to-end 2026-07-28 stateless tools/call (experimental entry + ClientSession pin) (#2917)

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Max 2026-06-20 14:55:59 +01:00 • committed by GitHub
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20
tests/interaction/transports/test_hosting_http.py
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@ -179,6 +179,26 @@ async def test_protocol_version_header_is_validated() -> None:
assert defaulted.status_code == 202
@requirement("hosting:http:protocol-version-rejection-literal")
async def test_unsupported_protocol_version_rejection_body_contains_the_sniffed_literal() -> None:
"""The 400 body for an unsupported MCP-Protocol-Version contains the substring peer SDKs sniff.
SDK-defined: other SDKs detect this rejection by substring-matching ``Unsupported protocol
version`` in the response body, so the literal must survive any rewording of the surrounding
message. Asserted at the wire because the SDK client never surfaces the rejection body.
"""
async with mounted_app(_server()) as (http, _):
session_id = await initialize_via_http(http)
response = await http.post(
"/mcp",
json={"jsonrpc": "2.0", "id": 2, "method": "ping"},
headers=base_headers(session_id=session_id) | {"mcp-protocol-version": "1991-01-01"},
)
assert response.status_code == 400
assert "Unsupported protocol version" in response.text
@requirement("hosting:http:json-response-mode")
async def test_json_response_mode_answers_with_application_json_not_sse() -> None:
"""With JSON response mode enabled, request POSTs are answered with a single application/json body.