Parts of portal.azure.com do not load, even with shields down

[MisinformedDNA]

Description of the issue:

When I try to access various features of portal.azure.com (the Azure Portal), certain widgets fail to load.

Steps to Reproduce (add as many as necessary):

1. Go to https://azure.microsoft.com/en-us/free/
2. Disable shields
3. Sign up for an Azure account.
4. Log in
5. On the top of the left nav bar, click “Create a resource” (if the nav is condensed, you may only see a green plus icon)
6. Under “Popular”, click “WebApp”

Actual Result (gifs and screenshots are welcome!):

Does not redirect to https://portal.azure.com/#create/Microsoft.WebSite to create a new Web App

Also, getting lots of 307 HTTP Status codes

And 307s just redirect to themselves:

Expected result:

Redirects to https://portal.azure.com/#create/Microsoft.WebSite to create a new Web App. Here’s what Chrome v. 69 looks like:

No 307s

Reproduces how often:

100%

Brave Version(about:brave):

Brave Beta 0.57.6

Reproducible on current live release (yes/no):

Works fine on 0.24.0 with shields up

Additional Information:

None.

[jlyman]

I have similar issues with the Azure Portal, but using Chrome has no problem with it. Shields down and uBlock also turned off.

Looks like it may have to do with the XHR requests that are being made, at least in part. I have several of these types of errors in the console when trying to access the Portal dashboard for example:

Access to XMLHttpRequest at 'https://management.azure.com/subscriptions/[blah blah]' from origin 'https://websites.hosting.portal.azure.net' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.

EDIT: v0.57.6 as well, macOS 10.14