502 errors from API requests

[nawatts]

A timeout between the load balancer and API service may result in a 502 HTML response being returned.

This happened on a query for variants in ENSG00000155657 when those were not in the cache.

https://cloud.google.com/load-balancing/docs/https#timeouts_and_retries

[nawatts]

This also happens for a short time when the API pod restarts.