Not connecting/discovering tools behind an MCP Proxy

Hi. Great tool.

I installed and deployed the server, and it works great when I connect directly.

I tried putting a FastMCP proxy in front of it, using the something like the code below:

docs_mcp_server_v2 = create_proxy(
  [URL to docs-mcp server], name="Docs MCP Proxy Server"
)

(https://gofastmcp.com/servers/composition)

In VS Code, I see: "Discovered 0 tools". though, there is not an error in the output of VS code.

In the terminal, I see: "connect_tcp.failed exception=ConnectError(OSError('All connection attempts failed'))". (This is the proxy).

Also, I am starting the server via http transport.

So, essentially, the server works perfectly (discovers 2 tools) when I connect to it directly from VS Code or another MCP client, but seems to have some error when I try to add a proxy in front of it.

Thanks in advance.

Start by reproducing the direct connection and the FastMCP create_proxy setup described in the issue, using the HTTP transport and the VS Code discovery flow. Compare the proxy's connection output with the direct server behavior; done means the proxy connects successfully and VS Code discovers the server's two tools.