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    <p>I recommend you use jQuery, instead of creating XmlHttpRequest objects manually, as it manages to solve some compatibility issues between browsers, and makes the whole thing way simpler.</p> <p>With jQuery, you will be able to do the request using something like this:</p> <pre><code>$.post({ url: "http://example.com/....", data: {"username": "your_user_here", "password": "your_password_here"}, success: function(){ alert('Success!'); } }); </code></pre> <p>Anyways, there are a lot of options there and the topic is quite long to fit in a SO answer, so I recommend you have a look at the jQuery Ajax documentation here: <a href="http://api.jquery.com/category/ajax/" rel="nofollow">http://api.jquery.com/category/ajax/</a></p> <p>and in particular this: <a href="http://api.jquery.com/jQuery.ajax/" rel="nofollow">http://api.jquery.com/jQuery.ajax/</a></p> <h2>Update</h2> <p><del>The only problem here is that php usually expects to receive data in form-encoded format, but with this your script will get json data.. (so, expect <em>not</em> to be able to use <code>$_POST</code>) with other languages (python, nodejs, ..) this is not a problem; I don't know how to handle this with php but I'm pretty confident there's a way to do that. Of course, you can fallback on sending form-encoded data, but JSON is the de-facto standard for these things nowdays..</del></p> <p>Sorry, I was remembering incorrectly, but the default behavior of jQuery is to urlencode the POST data, so you'll be fine with reading values from <code>$_POST</code>, when doing requests with the code above..</p>
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    1. POHow to properly send POST data?
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    1. COI'm going AFK, hope this helps, if you have any question, feel free to comment, I'll reply tomorrow..
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    2. COActually, jQuery.ajax converts the `data` setting to a properly encoded querystring http://api.jquery.com/jQuery.ajax/#jQuery-ajax-settings PHP wouldn't have an issue with processing it.
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    3. COgood that's already the default, I remembered it wasn't but I was wrong..
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