[Declarative Net Request] Header modification available on Stable in M85

[Kelvin Jiang]

Hi,

Header modification support has been added to the declarativeNetRequest API starting in M85 (also currently available in Beta/Dev/Canary). This change allows extensions to add/set/remove request and response headers.

Example rule:

{   "id": 10,   "priority": 2,   "action": {     "type": "modifyHeaders",       "requestHeaders": [         {"header": "referer", "operation": "remove"},       ],       "responseHeaders": [         {"header": "h1", "operation": "remove"},         {"header": "h2", "operation": "set", "value": "v2"},         {"header": "h3", "operation": "append", "value": "v3"}       ]     },     "condition": {       "urlFilter": "headers.com/123",       "resourceTypes": ["main_frame"]     }   } }

Documentation is available at https://developer.chrome.com/extensions/declarativeNetRequest#type-ModifyHeaderInfo with more examples. Please try out this functionality for yourself and let us know what you think by filing bugs feature requests.

Thanks,

Kelvin

Note: Currently, the documentation incorrectly lists the availability of ModifyheaderInfo as M86. ModifyHeaderInfo will be available on M85 Stable.

[Kelvin Jiang]

Crbug link: https://bugs.chromium.org/p/chromium/issues/detail?id=947591

[Dave Vandyke]

I gave it a quick go, but I found that appended CSP headers weren't enforced properly. I've filed a bug https://bugs.chromium.org/p/chromium/issues/detail?id=1116487

Cheers, Dave.

[Dave Vandyke]

Oh, I filed a few more bugs for modifyHeaders as well:

https://bugs.chromium.org/p/chromium/issues/detail?id=1117444

https://bugs.chromium.org/p/chromium/issues/detail?id=1117465

https://bugs.chromium.org/p/chromium/issues/detail?id=1117475

Cheers, Dave.