When developing chrome extensions, I wanted to use the XMLHttpRequest like this:
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var xhr = (function() {
var xhr = new XMLHttpRequest();
return function(method, url, callback) {
xhr.onreadystatechange = function() {
if (xhr.readyState === 4) {
callback(xhr.responseText, xhr.status);
}
};
xhr.open(method, url);
xhr.send();
};
})();
xhr('GET', 'https://foobar.com', function(data, status) {
// Some stuff
});
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However, just doing that does not work. You will receive the following error:
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XMLHttpRequest cannot load https://foobar.com. The 'Access-Control-Allow-Origin' header has a value 'https://foobar.com' that is not equal to the supplied origin. Origin 'chrome-extension://azertyuiopqsdfghjklm' is therefore not allowed access.
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The only thing you need to do is to modify your manifest.json and add the correct permissions:
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{
"permissions": [
"https://foobar.com/**/*",
]
}
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