flask how to get the HTTP_ORIGIN of a request

Question

I'd like to make a response with the "Access-Control-Allow-Origin" header been set all by myself, while it's seems messing up to figure out where the "HTTP_ORIGIN" parameter comes with the request is.

Answer 1

This will get you the answer

from flask import request
...
print(request.environ.get('HTTP_ORIGIN', 'default value'))