The Problem

When running google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2 with app runtime in app.yaml defined as go116/go118/go119/go120 any API call will fail.

The google.golang.org/appengine/v2 package will default the API host to appengine.googleapis.internal:10001 which won't work on a local computer.

When running the app locally with devappserver2 the following error appears:

Error: Failed to check daily cost: service bridge HTTP failed: Post "http://appengine.googleapis.internal:10001/rpc_http": dial tcp: lookup appengine.googleapis.internal: no such host

Potential Solution

It seems that the host can be overridden with the API_HOST env variable. The http_runtime.py file of devappserver2 contains the following constant:

# Runtimes which need
_RUNTIMES_NEED_VM_ENV_VARS = [
    'go111',
    'go114',
    'go115',
]

When I edit it to add the problematic Go versions then the API errors go away.

# Runtimes which need
_RUNTIMES_NEED_VM_ENV_VARS = [
    'go111',
    'go114',
    'go115',
    'go116',
    'go118',
    'go119',
    'go120',
]