JQuery Ajax Request: Change User-Agent

I'm using JQuery to issue an AJAX request开发者_JAVA技巧 to my own Webservice. I need to set or modify the User-Agent HTTP-Header for the HTTP-AJAX-Request, how can I do this the easiest way?

I tried the hint provided by some users to use the setRequestHeader Method to set the User-Agent, but this does not work. It does in fact work for other newly created headers (like X-Test-Header) but it does not work for User-Agent.

It is simply impossible, you are not allowed to change the user-agent for XMLHttpRequests. I'm not sure if this is valid for Internet-Explorer, but the w3c specifies here:

The setRequestHeader() method

[...]

When the setRequestHeader(header, value) method is invoked, the user agent must run these steps: [...]

Terminate these steps if header is a case-insensitive match for one of the following headers:

[...]

• User-Agent

If you are using jQuery, set the request header in the ajaxSetup.

$.ajaxSetup({
  beforeSend: function(request) {
    request.setRequestHeader("User-Agent","InsertUserAgentStringHere");
  }
});

Well, you could always use jQuery to post to a server-side page which then in turn is able to modify the User-Agent header, and also make a request to the page which would have been directly accessed by jQuery.

A way to do this is to overwrite the native code in the __defineGetter__ method of the window.navigator object.

Check this out:

window.navigator.__defineGetter__('userAgent', function () {
    return "___I'M A GHOST___";
});

Run navigator.userAgent in the console before and after to check.

Works in Chrome. I haven't checked other browsers.

You can read more about it here: https://www.codeproject.com/Tips/1036762/Mocking-userAgent-with-JavaScript

I have done it like this: I send the ajax request to a seperate php script that acts just like a forwarder, in this php script you will then make the original request and change the user-agent as you want.

You can set the user-agent in file_get_contents like this: https://gist.github.com/vyspiansky/82f4b1ef6fcff160047d