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from collections.abc import Generator
import pytest
from fastapi import FastAPI, Request
from fastmcp import Client, FastMCP
from fastmcp.client.transports import SSETransport, StreamableHttpTransport
from fastmcp.utilities.tests import run_server_in_process
def fastmcp_server_for_headers() -> FastMCP:
app = FastAPI()
@app.get("/headers")
def get_headers(request: Request):
return request.headers
@app.get("/headers/{header_name}")
def get_header_by_name(header_name: str, request: Request):
return request.headers[header_name]
@app.post("/headers")
def post_headers(request: Request):
return request.headers
mcp = FastMCP.from_fastapi(
app,
httpx_client_kwargs={"headers": {"x-server-header": "test-abc"}},
)
return mcp
def run_server(host: str, port: int, **kwargs) -> None:
fastmcp_server_for_headers().run(host=host, port=port, **kwargs)
def run_proxy_server(host: str, port: int, shttp_url: str, **kwargs) -> None:
client = Client(transport=StreamableHttpTransport(shttp_url))
app = FastMCP.as_proxy(client)
app.run(host=host, port=port, **kwargs)
class TestClientHeaders:
@pytest.fixture(scope="class")
def shttp_server(self) -> Generator[str, None, None]:
with run_server_in_process(run_server, transport="streamable-http") as url:
yield f"{url}/mcp"
@pytest.fixture(scope="class")
def sse_server(self) -> Generator[str, None, None]:
with run_server_in_process(run_server, transport="sse") as url:
yield f"{url}/sse"
@pytest.fixture(scope="class")
def proxy_server(self, shttp_server: str) -> Generator[str, None, None]:
with run_server_in_process(
run_proxy_server,
shttp_url=shttp_server,
transport="streamable-http",
) as url:
yield f"{url}/mcp"
async def test_client_headers_sse_resource(self, sse_server: str):
async with Client(
transport=SSETransport(sse_server, headers={"X-TEST": "test-123"})
) as client:
result = await client.read_resource("resource://get_headers_headers_get")
headers = json.loads(result[0].text) # type: ignore[attr-defined]
assert headers["x-test"] == "test-123"
async def test_client_headers_shttp_resource(self, shttp_server: str):
async with Client(
transport=StreamableHttpTransport(
shttp_server, headers={"X-TEST": "test-123"}
)
) as client:
result = await client.read_resource("resource://get_headers_headers_get")
headers = json.loads(result[0].text) # type: ignore[attr-defined]
assert headers["x-test"] == "test-123"
async def test_client_headers_sse_resource_template(self, sse_server: str):
async with Client(
transport=SSETransport(sse_server, headers={"X-TEST": "test-123"})
) as client:
result = await client.read_resource(
"resource://get_header_by_name_headers/x-test"
)
header = json.loads(result[0].text) # type: ignore[attr-defined]
assert header == "test-123"
async def test_client_headers_shttp_resource_template(self, shttp_server: str):
async with Client(
transport=StreamableHttpTransport(
shttp_server, headers={"X-TEST": "test-123"}
)
) as client:
result = await client.read_resource(
"resource://get_header_by_name_headers/x-test"
)
header = json.loads(result[0].text) # type: ignore[attr-defined]
assert header == "test-123"
async def test_client_headers_sse_tool(self, sse_server: str):
async with Client(
transport=SSETransport(sse_server, headers={"X-TEST": "test-123"})
) as client:
result = await client.call_tool("post_headers_headers_post")
headers = json.loads(result[0].text) # type: ignore[attr-defined]
assert headers["x-test"] == "test-123"
async def test_client_headers_shttp_tool(self, shttp_server: str):
async with Client(
transport=StreamableHttpTransport(
shttp_server, headers={"X-TEST": "test-123"}
)
) as client:
result = await client.call_tool("post_headers_headers_post")
headers = json.loads(result[0].text) # type: ignore[attr-defined]
assert headers["x-test"] == "test-123"
async def test_client_overrides_server_headers(self, shttp_server: str):
async with Client(
transport=StreamableHttpTransport(
shttp_server, headers={"x-server-header": "test-client"}
)
) as client:
result = await client.read_resource("resource://get_headers_headers_get")
headers = json.loads(result[0].text) # type: ignore[attr-defined]
assert headers["x-server-header"] == "test-client"
async def test_client_with_excluded_header_is_ignored(self, sse_server: str):
async with Client(
transport=SSETransport(
sse_server,
headers={
"x-server-header": "test-client",
"host": "1.2.3.4",
"not-host": "1.2.3.4",
},
)
) as client:
result = await client.read_resource("resource://get_headers_headers_get")
headers = json.loads(result[0].text) # type: ignore[attr-defined]
assert headers["not-host"] == "1.2.3.4"
assert headers["host"] == "fastapi"
async def test_client_headers_proxy(self, proxy_server: str):
"""
Test that client headers are passed through the proxy to the remove server.
"""
async with Client(transport=StreamableHttpTransport(proxy_server)) as client:
result = await client.read_resource("resource://get_headers_headers_get")
headers = json.loads(result[0].text) # type: ignore[attr-defined]
assert headers["x-server-header"] == "test-abc"
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