I have a Rails 4 application running on Heroku. For one type of request I make a HTTP call to an external service and then return the response to the client.
As I see from the logs, the request to the external service is taking too long and resulting in the Heroku's H12 error where it sends a 503 after 30 seconds. The HTTP request that I am making to the external service eventually comes back with a Net::ReadTimeout after some more time (60 seconds).
However if I run heroku run console and make the same HTTP call (through the same Ruby code), it works just fine. The request completes in about a second or two at the max.
I am unable to understand why this request is timing out when run from the web process while it works seamlessly in the heroku run console.
I am running Puma as my webserver. I followed guidelines given here : https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server I also tried the basic WEBrick server to see if that helps. But no avail.
Has anyone faced this issue? Any hints on how to debug this?