<p>We have been testing out the Google Healthcare API specifically with HL7 and as I've run through the tutorials I've hit a roadblock. I should mention that I have a fair bit of experience with Kubernetes and AWS, but not so much Google Cloud.</p>

<p>This step here is what is giving me trouble:</p>

<p><a href="https://cloud.google.com/healthcare/docs/how-tos/mllp-adapter#creating_a_compute_engine_vm_and_sending_messages" rel="nofollow noreferrer">https://cloud.google.com/healthcare/docs/how-tos/mllp-adapter#creating_a_compute_engine_vm_and_sending_messages</a></p>

<p>When I attempt to send the message from the VM I do not see a response, and the logs in the pod show me the following error:</p>

<pre><code>I0411 17:27:33.756432       1 healthapiclient.go:163] Dialing connection to https://healthcare.googleapis.com:443/v1beta1
I0411 17:27:58.809932       1 mllpreceiver.go:107] Accepted connection from 10.128.0.5:58698
I0411 17:27:58.810140       1 healthapiclient.go:182] Sending message of size 319.
E0411 17:27:58.880369       1 mllpreceiver.go:118] handleMessage: Send: request failed: 400
{
  "error": {
    "code": 400,
    "message": "location ID invalid, expected us-central1",
    "status": "INVALID_ARGUMENT"
  }
}
I0411 17:27:58.880691       1 mllpreceiver.go:119] Closed connection from 10.128.0.5:58698
</code></pre>

<p>This error is perplexing because the GKE cluster and the VM are in the same region/zone. Has anyone experienced a similar issue with the MLLP adapter and GKE?</p>

<p>It seems like the location id parameter in the path for the HL7v2 store (in yaml, <code>hl7_v2_location_id</code>) might be missing or incorrect; the error looks like it's being raised from the MLLP adapter's request to Cloud Healthcare API, rather than anything particular to GKE.  </p>
