Implement Background Tasks in FastAPI
Learn how to run background tasks and send an immediate response to the client using FastAPI.
What are background tasks?
Often when you get a request from a client, you do not want your API to process that data completely, else you will have to send a confirmation as soon as you receive a request and process that data or operation in the background. In other words, these are useful for operations that need to happen after a request, but the client doesn’t need to wait for the operation to get completed before receiving the response. For example:
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Email notifications sent after performing some action: Connecting to an email server and then sending an email could be a slow (several seconds) process. We can return the response right away and send the email notification in the background.
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Processing data: Let’s say you receive a file that must go through a file-processing operation. you can return the Accepted (
HTTP 202
) response and process the operation in the background.
You can easily implement this background processing in FastAPI
. Let us see how we can achieve this.
Implementing background tasks in FastAPI
You can define background tasks to be run after returning a response(kind-of confirmation).
Let us see the code now.
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