httpx.ConnectError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1002)

[1e9-7]

Description

I am currently using the mcp-python-sdk to set up an MCP client with Streamable HTTP as the transport layer protocol. However, since I'm working in an internal network environment, I encounter the following HTTPS error:

httpx.ConnectError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1002)
the code of me is:

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

async def main():
    # Connect to a streamable HTTP server
#the url of my mcp server can't avail
    async with streamablehttp_client("https://mcp.higress.ai/mcp-ip-query/cmfdmaly") 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())

To temporarily resolve this issue, I modified /.venv/Lib/site-packages/mcp/shared/_httpx_utils.py by adding "verify": False after line 66.

My request is to support passing a verify parameter when constructing the streamablehttp_client, allowing users to configure certificate verification flexibly without modifying the source code.

References

No response

[ruhz3]

#1177
The PR above is still in progress but addresses your request.

[felixweinberger]

Planning to get to this this week #1177