In which file did you encounter the issue?

com.google.endpoints.examples.hello.HelloWorldClient

https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/endpoints/getting-started-grpc/client/src/main/java/com/google/endpoints/examples/hello/HelloWorldClient.java

Did you change the file? If so, how?

NO.

Describe the issue

I followed all the steps in https://github.com/GoogleCloudPlatform/java-docs-samples/tree/master/endpoints/getting-started-grpc, it can run locally. I started the docker, enabled the HTTP traffic on the gce instance, created the api key on my project. But I still got 403 error as below. Please advise me how to debug this issue.

C02S715FFVH6:getting-started-grpc zhihua.wen$ java -jar client/build/libs/client.jar --host external_ip:80 --api_key <api_key>
Sep 27, 2017 3:27:18 PM io.grpc.internal.ManagedChannelImpl

INFO: [ManagedChannelImpl@4cdbe50f] Created with target external_ip:80

Sep 27, 2017 3:27:18 PM com.google.endpoints.examples.hello.HelloWorldClient greet
INFO: Will try to greet world ...
Sep 27, 2017 3:27:18 PM com.google.endpoints.examples.hello.HelloWorldClient$Interceptor interceptCall
INFO: Intercepted helloworld.Greeter/SayHello
Sep 27, 2017 3:27:18 PM com.google.endpoints.examples.hello.HelloWorldClient$Interceptor$1 start
INFO: Attaching API Key: <api_key>

Sep 27, 2017 3:27:19 PM com.google.endpoints.examples.hello.HelloWorldClient greet

WARNING: RPC failed: Status{code=UNAVAILABLE, description=Service control request failed with HTTP response code 403, cause=null}

Sep 27, 2017 3:27:19 PM io.grpc.internal.ManagedChannelImpl maybeTerminateChannel