Regulations for the Web Address of the Interactive Feature in AJAX

Recently, I decided to experiment with AJAX while trying to incorporate form validation from a database before allowing users to submit content. However, I encountered an issue with the URL segment of the Open function. It seems that when I use the full URL like , it doesn't work. Yet, if I simply use 'file.php' as the relative path, everything functions correctly. Can anyone shed light on what may be causing this specific problem and generally provide insight into the rules for the URL section of the Open function? Thank you in advance for any assistance provided; your swift responses never fail to amaze me.

xmlhttp.open("GET","myFile.php",true); WORKS FINE
xmlhttp.open("GET","http://www.mywebsite.com/folder/myFile.php",true); DOES NOT WORK?
javascriptajax

Answer №1

When it comes to XMLHttpRequests, adherence to the same origin policy is crucial. This means that requests must originate from the same domain as the one being accessed. The XMLHttpRequest object ensures this by treating the URL provided in the open() method as relative to the base URL stored on the same object, which is determined by the main Window object and the current browser URL.

To delve deeper into how the open() method works with XMLHttpRequest, you can refer to the W3C specifications here.

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