webRequest.StreamFilter.write()
Writes some response data to the output stream.
You can only call this function after the
onstart
event has fired.Syntax
filter.write(
data // ArrayBuffer or Uint8Array
)
Parameters
data
Uint8Array
orArrayBuffer
: array of bytes containing the data to pass to the browser's rendering engine.
Return value
None.
Browser compatibility
BCD tables only load in the browser
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.
Examples
This example uses write()
, to replace "Example" in the first chunk of the response with "WebExtension Example".
function listener(details) {
let filter = browser.webRequest.filterResponseData(details.requestId);
let decoder = new TextDecoder("utf-8");
let encoder = new TextEncoder();
filter.ondata = event => {
let str = decoder.decode(event.data, {stream: true});
// Just change any instance of Example in the HTTP response
// to WebExtension Example.
str = str.replace(/Example/g, 'WebExtension Example');
filter.write(encoder.encode(str));
filter.disconnect();
}
//return {}; // not needed
}
browser.webRequest.onBeforeRequest.addListener(
listener,
{urls: ["https://example.com/*"], types: ["main_frame"]},
["blocking"]
);