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fix(server): connectors header forwading #1553

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pilartomas merged 2 commits into from
Nov 13, 2025
Merged

fix(server): connectors header forwading #1553

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835269c
fix(server): connectors header forwading
pilartomas Nov 13, 2025
88bc591
fixup!
pilartomas Nov 13, 2025
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14 changes: 10 additions & 4 deletions apps/agentstack-server/src/agentstack_server/service_layer/services/connector.py
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Original file line number Diff line number Diff line change
Expand Up @@ -118,7 +118,7 @@ async def connect_connector(
) from err
elif isinstance(err, httpx.RequestError):
raise PlatformError(
"Connector must be in connected or auth_required state",
"Unable to establish connection with the connector",
status_code=status.HTTP_504_GATEWAY_TIMEOUT,
) from err
else:
Expand Down Expand Up @@ -382,7 +382,11 @@ def client_factory(headers=None, timeout=None, auth=None):
async def mcp_proxy(self, *, connector_id: UUID, request: Request, user: User | None = None) -> McpServerResponse:
connector = await self.read_connector(connector_id=connector_id, user=user)

forward_headers = {key: request.headers[key] for key in ["accept", "content-type"] if key in request.headers}
forward_headers = {
key: request.headers[key]
for key in ["accept", "content-type", "mcp-protocol-version", "mcp-session-id", "last-event-id"]
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@gemini-code-assist gemini-code-assist bot Nov 13, 2025

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medium

This list of headers is getting long. For better readability and maintainability, consider defining it as a module-level constant (e.g., a frozenset for efficient lookups).

For example:

# At the top of the file
_FORWARDED_MCP_HEADERS = frozenset((
    "accept",
    "content-type",
    "mcp-protocol-version",
    "mcp-session-id",
    "last-event-id",
))

# In the method:
# ...
for key in _FORWARDED_MCP_HEADERS:
# ...

if key in request.headers
}

exit_stack = AsyncExitStack()
try:
Expand All @@ -404,11 +408,13 @@ async def mcp_proxy(self, *, connector_id: UUID, request: Request, user: User |
)

content_type: str | None = response.headers.get("content-type")
session_id: str | None = response.headers.get("mcp-session-id")
is_stream = content_type.startswith("text/event-stream") if content_type else False

common = {
"status_code": response.status_code,
"headers": response.headers,
"media_type": content_type if is_stream else None,
"headers": {"mcp-session-id": session_id} if session_id else {},
"media_type": content_type,
}
if is_stream:

Expand Down
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