GitHub MCP Server looks unreachable in HTTP (but works using Docker) #931
Description
Describe the bug
I try to access GitHub MCP Server with Python and I get a 400 HTTP error.
Affected version
Successfully installed mcp-1.13.0 uvicorn-0.35.0
Steps to reproduce the behavior
- Get a GITHUB_PAT
- Complete and execute the provided script
import asyncio
from mcp import ClientSession
from mcp.client.streamable_http import streamablehttp_client
GITHUB_TOKEN = "XXXXX"
async def main():
# Connect to a streamable HTTP serverstreamastreamablehttp_client
async with streamablehttp_client(
"https://api.githubcopilot.com/mcp/",
{
"Authorization": f"""Bearer ${GITHUB_TOKEN}"""
}
) as (
read_stream,
write_stream,
_,
):
# Create a session using the client streams
async with ClientSession(read_stream, write_stream) as session:
# Initialize the connection
await session.initialize()
# List available tools
tools = await session.list_tools()
print(f"Available tools: {[tool.name for tool in tools.tools]}")
if __name__ == "__main__":
asyncio.run(main())- See error
Expected vs actual behavior
Expected: the list of available tools
(venv) ➜ mcp-client ./venv/bin/python stdio_github_mcp_docker_ok.py
time=2025-08-20T10:06:34.182Z level=INFO msg="starting server" version=v0.12.1 host="" dynamicToolsets=false readOnly=false
GitHub MCP Server running on stdio
add_comment_to_pending_review
add_issue_comment
add_sub_issue
assign_copilot_to_issue
cancel_workflow_run
create_and_submit_pull_request_review
create_branch
create_gist
create_issue
create_or_update_file
create_pending_pull_request_review
create_pull_request
...
Current: an HTTP 400 error
Logs
Here is the error message:
(venv) ➜ mcp-client ./venv/bin/python http_github_mcp.py
+ Exception Group Traceback (most recent call last):
| File "/home/dev/Projects/sfeir/mcp-client/http_github_mcp.py", line 31, in <module>
| asyncio.run(main())
| File "/usr/lib/python3.12/asyncio/runners.py", line 194, in run
| return runner.run(main)
| ^^^^^^^^^^^^^^^^
| File "/usr/lib/python3.12/asyncio/runners.py", line 118, in run
| return self._loop.run_until_complete(task)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/usr/lib/python3.12/asyncio/base_events.py", line 687, in run_until_complete
| return future.result()
| ^^^^^^^^^^^^^^^
| File "/home/dev/Projects/sfeir/mcp-client/http_github_mcp.py", line 11, in main
| async with streamablehttp_client(
| File "/usr/lib/python3.12/contextlib.py", line 231, in __aexit__
| await self.gen.athrow(value)
| File "/home/dev/Projects/sfeir/mcp-client/venv/lib/python3.12/site-packages/mcp/client/streamable_http.py", line 476, in streamablehttp_client
| async with anyio.create_task_group() as tg:
| File "/home/dev/Projects/sfeir/mcp-client/venv/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 772, in __aexit__
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "/home/dev/Projects/sfeir/mcp-client/venv/lib/python3.12/site-packages/mcp/client/streamable_http.py", line 407, in handle_request_async
| await self._handle_post_request(ctx)
| File "/home/dev/Projects/sfeir/mcp-client/venv/lib/python3.12/site-packages/mcp/client/streamable_http.py", line 278, in _handle_post_request
| response.raise_for_status()
| File "/home/dev/Projects/sfeir/mcp-client/venv/lib/python3.12/site-packages/httpx/_models.py", line 829, in raise_for_status
| raise HTTPStatusError(message, request=request, response=self)
| httpx.HTTPStatusError: Client error '400 Bad Request' for url 'https://api.githubcopilot.com/mcp/'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400