JQuery Ajax Request: Change User-Agent

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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

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