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These requests are intended to be served by your application quickly.

You can read more about this below in Timeout behavior. If your server requires longer than 30 seconds to complete a given request, we recommend moving that work to a background task or worker to periodically ping your server to see if the processing request has been finished.

This pattern frees your web processes up to do more work, and decreases overall application response times.

To avoid this situation Heroku recommends setting a timeout within your application and keeping the value well under 30 seconds, such as 10 or 15 seconds.

Unlike the routing timeout, these timers will begin when the request begins being processed by your application.

In some cases where you must process these requests during your web request, you should always plan for the failure case.

Most languages let you specify a timeout on HTTP requests, for example.

However, each byte transmitted thereafter (either received from the client or sent by your application) resets a rolling 55 second window.

If no data is sent during the 55 second window, the connection will be terminated.

Request timeouts can also be caused by queueing of TCP connections inside the dyno.

Some languages and frameworks process only one connection at a time, but it’s possible for the routers to send more than one request to a dyno concurrently.

This problem can be ameliorated by the following techniques, in order of typical effectiveness: Many web applications allow users to upload files.