Accessing request object in DB_CONNECTION_MUTATOR in 4.1.0

[michalc]

Hi,

In 4.0.2 (and earlier) I could access the flask request object in the DB_CONNECTION_MUTATOR, and specifically get the request headers. However, in 4.1.0 the request object's URL seems to be http://localhost/ which is very odd: localhost isn't involved in my setup, and at no point the default http port is used. Also, the only header available on the request object seems to be the Host header, when I'm fairly sure there are lots more headers being sent into Superset. It seems like a fake/dummy request object has come from somewhere?

The following is how I determine what the request object looks like from inside DB_CONNECTION_MUTATOR (raising an Exception which then becomes visible in the UI)

def DB_CONNECTION_MUTATOR(uri, params, username, security_manager, source):
    from flask import request
    raise Exception(str(list(request.headers.keys())) + ' ' + request.url)

How can I get at the real HTTP headers from inside DB_CONNECTION_MUTATOR? If it makes a difference, I am testing from within SQL Lab

[michalc]

I've currently got a suspicion that the culprit could be https://github.com/apache/superset/pull/29461/files: it does look a little bit like there's a test context in the mutator

[michalc]

Adding this to my superset_config.py seems to fix it:

from flask import Flask
Flask.test_request_context = contextlib.nullcontext