An event handler that will be called when an error occurs. This is most often because an invalid request ID was passed into webRequest.filterResponseData()
.
After this event is fired, the webRequest.StreamFilter.error
property will contain a message giving more information about the error.
Note that this event is not triggered for network errors.
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Chrome | Edge | Firefox | Firefox for Android | Opera | |
---|---|---|---|---|---|
Basic support | No | No | 57 | 57 | No |
Examples
This example adds an onerror
listener which logs the value of webRequest.StreamFilter.error
.
function listener(details) { let filter = browser.webRequest.filterResponseData("12345"); filter.onerror = event => { console.log(`Error: ${filter.error}`); } return {}; } browser.webRequest.onBeforeRequest.addListener( listener, {urls: ["<all_urls>"], types: ["main_frame"]}, ["blocking"] );