Keep code running after response has been sent. (To respond with HTTP requests to other servers) about flask

[PokerBuddyAI]

I suppose one could import thousands of lines of code and add yet another layer of scheduling abstraction.

But I'd rather remove than add

[ThiefMaster]

That's now how HTTP works. There's one response (status code / headers). Of course you can send/stream whatever you want in the body, but it doesn't sound like you want to do that...

Thanks for the response Adrian.

I understand that each Request can only have one response. Not sure what would even happen if two responses are sent in response to one request, don't care.

What this thread is about is, recognizing that limitation, many server-to-server servers that need to send more than one response per request, effectively send nothing on the corresponding http response, but send new HTTP requests altogether, in all likelihood the responses of these second requests is ignored as well.

This image from the docs linked above should clarify

As you can see the traditional approach is diagrammed in 2. But the approach I'm referring to is diagrammed in 1. This allows multiple replies (Outgoing Request) per incoming request to the Flask server.

This may be out of scope for flask, I will take a look into using Werkzeug directly, which may have a more native approach towards this, that may not even need threading, in essence we just want to (send a response/do stuff) without closing the inbound-request-thread.

It's just that in Flask sending an HTTP response and closing the request-thread seem to be tightly coupled. Perhaps there is a way and I'm just ignorant of it. I typically send an http response returning from a function marked as a route, maybe there's something like flask.respond(200,"Hello")

If not, that would be the ideal API flask.respond(status_code,body), function may be called respondAndContinue if you want to avoid confusion.

[davidism]

You're looking for a background task queue. https://flask.palletsprojects.com/en/3.0.x/patterns/celery/

[pgjones]

This is a good use case for Quart and the background tasks.