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POST to a website

Is there a way through which we can send some data using POST to a website?

Here you got engine API for HTTP
https://docs.unrealengine.com/latest/INT/API/Runtime/HTTP/index.html
Alternativly you could use some external libery

Yup, we have used FHttpModule to send some GET requests successfully, but sending a POST request should be quite similar.

Hint: Look for FHttpModule in the UE4 source and you’ll see some real examples while they add some more documentation ;).