Using in Python with mcp streamable_http_client

[coderdba]

I have the following Python client code, but I keep getting 400 - Client error '400 Bad Request' for url 'https://api.githubcopilot.com/mcp/'

What is the fix for this? (NOTE: I tried many request bodies, none worked. They are commented for reference)

I think the error is happening in this line:
client-native-http.py", line 16, in main | async with streamablehttp_client(

Question:

1. Is the issue in the step to create streamablehttp_client
2. Further, what is the right way to call the client - that is, the line result = await session.call_tool ...

Code:

# Based on https://github.com/sooperset/mcp-atlassian?tab=readme-ov-file
# Issue: https://github.com/github/github-mcp-server/issues/598

import asyncio
import os

from mcp.client.streamable_http import streamablehttp_client
from mcp import ClientSession

async def main():
    
    # Bearer token from environment variable or configuration
    bearer_token=os.getenv("GITHUB_PAT")
 
    # Connect to streamable HTTP server with custom headers
    async with streamablehttp_client(
        "https://api.githubcopilot.com/mcp/",
        headers={
            "Authorization": f"Bearer {bearer_token}"
        }
    ) as (read_stream, write_stream, _):
        
        print("\n\nINFO - Main: In streamablehttp_client part.")
        # Create a session using the client streams
        async with ClientSession(read_stream, write_stream) as session:
            # Initialize the connection
            await session.initialize()

            print("\n\nINFO - Main: session is: ", session)
            
            # Get-me 
            result = await session.call_tool({
                "name": "get_me",
                "arguments": {"reason": "for information about the user"}
            })
            
            '''
            result = await session.call_tool(
                "get_me",
                {"reason": "for information about the user"}
            )
            '''
            
            '''
            result = await session.call_tool(
                name="get_me",
                arguments={"reason": "for information about the user"}
            )
            '''

            '''
            result = await session.call_tool(
                #"list_branches",
                "get_repo",
                {"message": "list my git repos"},
                #{"owner": "coderdba", "repo": "NOTES"}
            )
            '''
            
            print(result)

asyncio.run(main())

Errors:

python client-native-http.py


INFO - Main: In streamablehttp_client part.
  + Exception Group Traceback (most recent call last):
  |   File "C:\mcp-poc01\mcp-clients\github-official\client-native-http.py", line 62, in <module>
  |     asyncio.run(main())
  |   File "C:\Users\GSM078\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 190, in run
  |     return runner.run(main)
  |            ^^^^^^^^^^^^^^^^
  |   File "C:\Users\GSM078\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 118, in run
  |     return self._loop.run_until_complete(task)
  |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File "C:\Users\GSM078\AppData\Local\Programs\Python\Python311\Lib\asyncio\base_events.py", line 653, in run_until_complete
  |     return future.result()
  |            ^^^^^^^^^^^^^^^
  |   File "C:\mcp-poc01\mcp-clients\github-official\client-native-http.py", line 16, in main
  |     async with streamablehttp_client(
  |   File "C:\Users\GSM078\AppData\Local\Programs\Python\Python311\Lib\contextlib.py", line 231, in __aexit__
  |     await self.gen.athrow(typ, value, traceback)
  |   File "c:\opt\python-virtual-env\mcphttp\Lib\site-packages\mcp\client\streamable_http.py", line 459, in streamablehttp_client
  |     async with anyio.create_task_group() as tg:
  |   File "c:\opt\python-virtual-env\mcphttp\Lib\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 "c:\opt\python-virtual-env\mcphttp\Lib\site-packages\mcp\client\streamable_http.py", line 388, in handle_request_async
    |     await self._handle_post_request(ctx)
    |   File "c:\opt\python-virtual-env\mcphttp\Lib\site-packages\mcp\client\streamable_http.py", line 266, in _handle_post_request
    |     response.raise_for_status()
    |   File "c:\opt\python-virtual-env\mcphttp\Lib\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
    +------------------------------------

Thank you

[SamMorrowDrums]

Is there any body content returned with the 400 error? The general configuration looks right to me (although not an expert on the python client lib), and I wonder if there's some debug information you are missing about what specific problem is causing the 400 error.

Can you check and let me know?