Is it possible to spoof http request headers within javascript inside the client browser?
I was wondering whether it would be possible to modify the http request headers (such as HOSTS:) for sites that are using image pixel tracking.
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what about these plugins : https://addons.mozilla.org/en-GB/firefox/addon/modify-headers/ and https://addons.mozilla.org/en-US/firefox/addon/tamper-data/ – elsadek Dec 10 '16 at 08:20
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w/ajax some headers yes, some no. but for requests from
s, you don't have any direct header control. – dandavis Dec 10 '16 at 09:10
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What do you mean by "within Javascript"? – Arminius Dec 10 '16 at 09:19
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Unlikely as this would be a serious security issue. However, as @elsadek suggests, it might be possible from a browser addin which has more access. Certainly not possible from in-page JavaScript.
However, in terms of blocking tracking pixels. The issue is, how do you know whether an image will be a tracking pixel image BEFORE you access it? Once your browser has issued the request for it, the server already has your details.
Julian Knight
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