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/ answers: 1 / hits: 22680
/ 12 Years ago, wed, may 30, 2012, 12:00:00
I was facing an issue while developing this small userscript. When I wanted to block every XMLHttpRequest from the running website with my script, nothing was happening (at least with Chrome):
function main() {
// Override XHR.open with a custom function
window.XMLHttpRequest.prototype.open = function() {
// Nothing... so it's supposed to block every xhr.open() call
}
}
main();
Same thing when replacing window by unsafeWindow.
However, when I used this little trick, everything worked like a charm:
// No more call to main(), and:
var script = document.createElement(script);
script.textContent = ( + main.toString() + )();;
document.body.appendChild(script);
Every call to xhr.open is replaced by my custom function, no more AJAX.
So I guess the window element is not the same when main is called from inside the script than when it's called from a <script></script> container. Can someone explain me why ?
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