1916642 - Requests caused by redirects have the same request ID in webRequest.onSendHeaders and webRequest.onHeadersReceived

Status: RESOLVED INVALID

(WebExtensions :: Request Handling, defect)

Description

[Claire]

Attachment: MRE Extension

Steps to reproduce:

1. Download Firefox Nightly (Build ID: Mozilla/5.0 (X11; Linux x86_64; rv:132.0) Gecko/20100101 Firefox/132.0 ID:20240903210242)
2. Install an extension that uses webRequest.onSendHeaders and/or webRequest.onHeadersReceived which logs duplicate request IDs (an example is provided in the attachment "MRE extension"/"ffb.zip")
3. Go to about:debugging -> "This Firefox" -> "Inspect" on the extension
4. In the main Firefox window, navigate to a URL which causes a redirect

Actual results:

Both webRequest.onSendHeaders and webRequest.onHeadersReceived are fired twice each. The request IDs for the request that caused the redirect, and the request which is redirected to are the same.

Expected results:

Both webRequest.onSendHeaders and webRequest.onHeadersReceived are fired twice each. The request IDs for the request that caused the redirect, and the request which is redirected to should've been different.

Comment 1

[Claire]

Attachment: MRE Redirect Server

Comment 2

[Claire]

Attachment: Example screen recording

Comment 3

[Luca Greco [:rpl] [:luca] [:lgreco]]

Needinfo-ing Rob to take a look into this.

Comment 4

[Rob Wu [:robwu]]

The requestId being constant across redirects is intentional and documented:

It stays the same throughout a request, even across redirections and authentication exchanges.

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest