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add 'http_headers' parameter to FastApiMCP constructor #187

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add 'http_headers' parameter to FastApiMCP constructor #187

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19 changes: 15 additions & 4 deletions fastapi_mcp/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,14 @@ def __init__(
"""
),
] = None,
http_headers: Annotated[
Optional[List[str]],
Doc(
"""
Optional list of headers to forward to the API calls. Headers are case-insensitive.
"""
),
] = None,
include_operations: Annotated[
Optional[List[str]],
Doc("List of operation IDs to include as MCP tools. Cannot be used with exclude_operations."),
Expand Down Expand Up @@ -147,6 +155,9 @@ def __init__(
timeout=10.0,
)

self._http_headers_lowercase_set = { h.lower() for h in http_headers or [] }
self._http_headers_lowercase_set.add("authorization")

self.setup_server()

def setup_server(self) -> None:
Expand Down Expand Up @@ -407,11 +418,11 @@ async def _execute_api_tool(
raise ValueError(f"Parameter name is None for parameter: {param}")
headers[param_name] = arguments.pop(param_name)

# Add headers that we want to forward.
if http_request_info and http_request_info.headers:
if "Authorization" in http_request_info.headers:
headers["Authorization"] = http_request_info.headers["Authorization"]
elif "authorization" in http_request_info.headers:
headers["Authorization"] = http_request_info.headers["authorization"]
for k, v in http_request_info.headers.items():
if k.lower() in self._http_headers_lowercase_set:
headers[k] = v

body = arguments if arguments else None

Expand Down