Bug 290922

Summary:

declarativeNetRequest modifyHeaders doesn't support custom headers

Product:

WebKit

Reporter:

Jeff Johnson <opendarwin>

Component:

WebKit Extensions

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

ewan.leith, github.reformist202, timothy, vlkv, webkit-bug-importer, webkit.org

Priority:

Keywords:

InRadar

Version:

Safari 18

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
Example extension background.js	none
Sample extension manifest.json	none
1-star App Store review of Safari extension	none

Jeff Johnson

Reported 2025-04-02 07:46:14 PDT

Created attachment 474805 [details] Example extension background.js Unlike Chrome and Firefox, Safari doesn't support custom headers with declarativeNetRequest modifyHeaders. Attached is a sample web extension demonstrating the issue. The extension gives the following error: "Invalid call to declarativeNetRequest.updateDynamicRules(). The 'addRules' value is invalid, because an error with rule at index 0: Rule with id 1 is invalid. The header `Foo` is not recognized." Another, tangential issue is that updateDynamicRules throws an exception, caught in my try-catch block, rather than rejecting the promise that's supposed to be returned by updateDynamicRules.

Attachments
Example extension background.js (1.92 KB, application/x-javascript) 2025-04-02 07:46 PDT, Jeff Johnson	no flags	Details
Sample extension manifest.json (398 bytes, application/json) 2025-04-02 07:46 PDT, Jeff Johnson	no flags	Details
1-star App Store review of Safari extension (40.76 KB, image/png) 2026-03-19 04:21 PDT, Jeff Johnson	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Jeff Johnson

Comment 1 2025-04-02 07:46:32 PDT

Created attachment 474806 [details] Sample extension manifest.json

Radar WebKit Bug Importer

Comment 2 2025-04-02 07:46:55 PDT

<rdar://problem/148430468>

Timothy Hatcher

Comment 3 2025-06-13 12:02:51 PDT

*** Bug 293576 has been marked as a duplicate of this bug. ***

Pas

Comment 4 2025-10-30 10:26:20 PDT

bump. I hope this can get fixed soon

Jeff Johnson

Comment 5 2026-03-19 04:21:32 PDT

Created attachment 478722 [details] 1-star App Store review of Safari extension Attached is a screenshot of a 1-star App Store user review that my Safari extension received due to this bug.

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