beta_settings: use_endpoints_api_management is not working

[Eng-Fouad]

Whenever I use the following configuration inside app.yaml:

beta_settings:
    use_endpoints_api_management: true        # enable Google Cloud Endpoints API management

the endpoints APIs don't work anymore. It gives me HTTP 503 Service Unavailable all the time.

I am using endpoints v2 on java flexible environment.

[Eng-Fouad]

When I enable it, I can see the following in google console logging:

[warn] 28#0: Using trusted CA certificates file: /etc/nginx/trusted-ca-certificates.crt
[emerg] 28#0: Failed to open an api service configuration file: /etc/nginx/endpoints/service.json in /etc/nginx/nginx.conf:396
[emerg] 28#0: There were errors with Endpoints api service configuration.

[Eng-Fouad]

Solved the issue by changing this

automatic_scaling:
  min_num_instances: 1
  max_num_instances: 1

to

automatic_scaling:
  min_num_instances: 2
  max_num_instances: 2

in app.yaml.

and using runtime: custom with Dockerfile:

FROM gcr.io/google_appengine/jetty9

ADD flexible-endpoints-1.0-SNAPSHOT.war $JETTY_BASE/webapps/root.war
ADD . /app

[Eng-Fouad]

Resolved the issue totally by removing the base path "/_ah/api". This is the major problem, don't use it.