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eafc773 c219134 eafc773 c219134 eafc773 c219134 eafc773 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 | import json
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.server.openapi import MCPType, RouteMap
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"}},
route_maps=[
# GET requests with path parameters go to ResourceTemplate
RouteMap(
methods=["GET"],
pattern=r".*\{.*\}.*",
mcp_type=MCPType.RESOURCE_TEMPLATE,
),
# GET requests without path parameters go to Resource
RouteMap(methods=["GET"], pattern=r".*", mcp_type=MCPType.RESOURCE),
],
)
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:
app = FastMCP.as_proxy(StreamableHttpTransport(shttp_url))
app.run(host=host, port=port, **kwargs)
@pytest.fixture(scope="module")
def shttp_server() -> Generator[str, None, None]:
with run_server_in_process(run_server, transport="http") as url:
yield f"{url}/mcp"
@pytest.fixture(scope="module")
def sse_server() -> Generator[str, None, None]:
with run_server_in_process(run_server, transport="sse") as url:
yield f"{url}/sse"
@pytest.fixture(scope="module")
def proxy_server(shttp_server: str) -> Generator[str, None, None]:
with run_server_in_process(
run_proxy_server,
shttp_url=shttp_server,
transport="http",
) as url:
yield f"{url}/mcp"
async def test_fastapi_client_headers_streamable_http_resource(shttp_server: str):
async with Client(transport=StreamableHttpTransport(shttp_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"
async def test_fastapi_client_headers_sse_resource(sse_server: str):
async with Client(transport=SSETransport(sse_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"
async def test_fastapi_client_headers_streamable_http_tool(shttp_server: str):
async with Client(transport=StreamableHttpTransport(shttp_server)) as client:
result = await client.call_tool("post_headers_headers_post")
headers: dict[str, str] = result.data
assert headers["x-server-header"] == "test-abc"
async def test_fastapi_client_headers_sse_tool(sse_server: str):
async with Client(transport=SSETransport(sse_server)) as client:
result = await client.call_tool("post_headers_headers_post")
headers: dict[str, str] = result.data
assert headers["x-server-header"] == "test-abc"
async def test_client_headers_sse_resource(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(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(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(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(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: dict[str, str] = result.data
assert headers["x-test"] == "test-123"
async def test_client_headers_shttp_tool(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: dict[str, str] = result.data
assert headers["x-test"] == "test-123"
async def test_client_overrides_server_headers(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(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(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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