I deployed a Django app on Heroku. I have a function (inside views) in my app that take some time (3m-5m) before it returns.

The problem is that function doesn't return when the app is deployed to Heroku. On my PC it works fine.

Heroku is not giving me useful feedback. There is no 'timeout' or anything in the logs.

CodePudding user response：

Three to five minutes is way too long for a request to take. Heroku will kill such requests:

Best practice is to get the response time of your web application to be under 500ms, this will free up the application for more requests and deliver a high quality user experience to your visitors. Occasionally a web request may hang or take an excessive amount of time to process by your application. When this happens the router will terminate the request if it takes longer than 30 seconds to complete.

I'm not sure why you aren't seeing timeouts in the logs, but if you truly need that much time to compute something you'll need to do it asynchronously.

There are lots of ways to do that, e.g. you could queue the work and then respond immediately with a "loading" state, then poll the back-end and update the view when the result is ready.

Start by reading Worker Dynos, Background Jobs and Queueing and then decide how you wish to proceed. We can't tell you the "right" way of doing this; it's something you need to decide about your application.