mirror of
https://github.com/mdn/webextensions-examples.git
synced 2026-04-16 06:18:35 +02:00
50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
"use strict";
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/*
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This is the page for which we want to rewrite the User-Agent header.
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*/
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var targetPage = "https://httpbin.org/*";
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/*
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Map browser names to UA strings.
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*/
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var uaStrings = {
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"Firefox 41": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:41.0) Gecko/20100101 Firefox/41.0",
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"Chrome 41": "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36",
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"IE 11": "Mozilla/5.0 (compatible, MSIE 11, Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko"
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}
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/*
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Initialize the UA to Firefox 41.
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*/
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var ua = uaStrings["Firefox 41"];
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/*
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Rewrite the User-Agent header to "ua".
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*/
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function rewriteUserAgentHeader(e) {
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for (var header of e.requestHeaders) {
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if (header.name.toLowerCase() === "user-agent") {
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header.value = ua;
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}
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}
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return {requestHeaders: e.requestHeaders};
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}
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/*
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Add rewriteUserAgentHeader as a listener to onBeforeSendHeaders,
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only for the target page.
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Make it "blocking" so we can modify the headers.
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*/
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browser.webRequest.onBeforeSendHeaders.addListener(rewriteUserAgentHeader,
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{urls: [targetPage]},
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["blocking", "requestHeaders"]);
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/*
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Update ua to a new value, mapped from the uaString parameter.
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*/
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function setUaString(uaString) {
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ua = uaStrings[uaString];
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}
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