Getting a timeout error when I try accessing an fastmcp server deployed on cloud run

[Kamal-Moha]

Hi all, I have dockerized & deployed a fastmcp server to cloud run on port 8080 exposed. When I try accessing the server in an MCP client, I get a timeout error. When I check cloud run logs, I see this “Truncated response body. Usually implies that the request timed out or the application exited before the response was finished.“

Though the dockerized fastmcp server is working fine locally when I test it. It’s weird seeing it get a timeout error in cloud run. I have used fastmcp version 2.11.2 and this is how I exposed the fastmcp

from fastmcp import FastMCP
mcp = FastMCP("meta-ads")
.....
mcp.run(
        transport="http",
        host="0.0.0.0",
        port=8080,
        path="/mcp",
        log_level="debug",
    )

I have used the following resources in the cloud run service;

• Memory of 4GiB and 2 vCPU.
• I have set the request timeout to 800
• I have set the Minimum number of instances to 1.

The following resources should be more than enough, I really don’t know why this is happening. Please help.