Detecting auto-proxy details in Javascript
2 answers
Why it's worth: While you're asking about JavaScript, accessing browser proxy settings even from any type of browser plug-in like Flash or Java applet is also not possible, or at least not in any reliable or compatible way.
I only mention this because sometimes plugins like this provide viable workarounds for when JavaScript is unable to do something ... but here I think you are SOL
Perhaps you could tell us a little more about what you are trying to achieve? Perhaps there is another way to meet your needs.
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