Bug 253696 – declarativeNetRequest modifyHeaders doesn't work for fetch requests initiated from the same Safari extension

• Component: WebKit Extensions
• Status: REOPENED

ModifyHeaders in declarativeNetRequest  does not work for fetch requests from the extension.
This might be since the extension does not have permission over the safari-extension://GUID/ origin which is reset on every browser launch.

Expected behaviour:
The extension should have permissions for its own origin by default and should be able to modify headers for requests initiated from its own background page.

As such adding a rule like this should work:

browser.declarativeNetRequest.updateDynamicRules({
   addRules: [{
      "id": 1, 
      "priority": 1, 
      "action": {
         "type": "modifyHeaders", 
         "requestHeaders": [{"header": "origin", "operation": "set", "value": "https://www.bar.com"}]
      }, 
      "condition": {
         "urlFilter": "http://foo.com", // Any URL that the extension has permissions for
         "resourceTypes": ["main_frame", "xmlhttprequest"]
      }
   }],
})


Current behaviour:
The rule currently does not work

[Radar WebKit Bug Importer]

<rdar://problem/106851279>

Bump! 


Summary: Consider allowing header modification (specifically the origin) using declarativeNetRequest modifyHeaders for fetch requests made by the extension.

[Karl Dubost]

Thanks for the report, probably a duplicate of

*** This bug has been marked as a duplicate of bug 246493 ***

[Karl Dubost]

*** Bug 263818 has been marked as a duplicate of this bug. ***

[Karl Dubost]

I'm changing the resolution as declarativeNetRequest has been released but some of its features are not implemented.

[Nicholas Lim]

Hi, may I know if there is a tracker for progress on the declarativeNetRequest API? Thanks!

[Gabriel Aubut-Lussier]

I would like to add that websocket connections are also affected by this current limitation. Assuming the resourceTypes also include "websocket", I would expect a `new WebSocket("wss://example.com");` to match against the rule and be modified accordingly.