Github MCP server not working with a web based MCP client. CORS issue

[dsn12311]

Describe the bug

I have a web based IDE as an MCP client, that allows for remote MCP server configuration. It doesn't work for remote MCP server. MCP client works for another remote MCP server.

Access to fetch at 'https://api.githubcopilot.com/mcp/' from origin 'https://awesome.myinstance.com' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed. Have the server send the header with a valid value

Affected version

remote MCP server URL https://api.githubcopilot.com/mcp/

Steps to reproduce the behavior

1. web based MCP client
2. connect Github MCP remote server.

Expected vs actual behavior

CORS issue. It should work like it works on desktop based MCP client.

Logs

Access to fetch at 'https://api.githubcopilot.com/mcp/' from origin 'https://awesome.myinstance.com' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed. Have the server send the header with a valid value