How to change browser User-Agent Header with javaScript?

问题

Following code changes property printed (when accessed through javaScript) by browser console and not the actual Use-Agent string sent with the header.

Object.defineProperty(navigator, 'userAgent', {
    get: function () { return 'Mozilla/5.0 (Windows NT 6.2; WOW64; 
    rv:28.0) Gecko/20100101 Firefox/28.0)'; }
});

回答1:

This isn't possible from the page itself. The user agent string (as sent in the HTTP request headers) can only be changed via browser extension or browser configuration.

来源：https://stackoverflow.com/questions/58005954/how-to-change-browser-user-agent-header-with-javascript