onSendHeaders Fires after all extensions have had a chance to modify the request headers, and presents the final (*) version. This event can be used to cancel the request. The onBeforeSendHeaders event is passed to all subscribers, so different subscribers may attempt to modify the request see the Implementation details section for how this is handled. The event is intended to allow extensions to add, modify, and delete request headers (*). onBeforeSendHeaders (optionally synchronous) Fires when a request is about to occur and the initial headers have been prepared. This event is sent before any TCP connection is made and can be used to cancel or redirect requests. OnBeforeRequest (optionally synchronous) Fires when a request is about to occur. The event life cycle for successful requests is illustrated here, followed by event definitions: Certain synchronous events will allow you to intercept, block, or modify a request. You can use these events to observe and analyze traffic. ![]() The web request API defines a set of events that follow the life cycle of a web request. Policy installed extensions can continue to use "webRequestBlocking". Aside from "webRequestBlocking", the webRequest API will be unchanged and available for normal use. ![]() Consider "declarativeNetRequest", which enables use of the declarativeNetRequest API. As of Manifest V3, the "webRequestBlocking" permission is no longer available for most extensions.
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