On Tue, Dec 15, 2015 at 2:37 PM, Thomas Steiner <[email protected]> wrote:

> On a more technical note—trying to be a good citizen [3]—the client
> library sets an identifying User-Agent header in Node.js mode.
> However, trying to set the corresponding X-User-Agent (note the "X-")
> header from a browser context (XMLHttpRequest cannot override the
> browser's intrinsic User-Agent for security reasons), this fails with
> an error message "Request header field X-User-Agent is not allowed by
> Access-Control-Allow-Headers in preflight response". Maybe you could
> change your CORS settings and include X-User-Agent in your
> Access-Control-Allow-Headers?!
>

 Filed as https://phabricator.wikimedia.org/T121823
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