1347874 - webRequest.onBeforeRequest redirectUrl not blocking original request

Status: RESOLVED DUPLICATE of bug 1345893

(WebExtensions :: Untriaged, defect)

Description

[Lucas Ricoy]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

Steps to reproduce:

It is reproduced don Firefox 52 following the following steps:

In a web extension with the required permissions:

1. Add a listener to webRequest.onBeforeRequest with ['blocking']
2. Return a BlockingRequest object with {redirectUrl: <URL>}


Notes: 
- Works fine on Chrome and Opera.
- Also do not work with the new Promises handlers
- The { cancel: true } approach works fine to block a request.



Actual results:

The redirectedUrl is reached and returned but the original destination still receives the original request.


Expected results:

The original request is redirected to the new URL and the original destination is never reached.