How does Access-Control-Allow-Origin header work

Question

Until now my understanding of its semantics is:

• A client downloads javascript code MyCode.js from http://siteA - the origin.
• The response header of MyCode.js contains Access-Control-Allow-Origin: http://siteB, I thought it can cross-origin references with the other site.

I referred to Cross-origin resource sharing and understood that all I knew was wrong, I studied other articles but still, I didn't understand how to use this header. How do I enable the javascript code downloaded from site A to access resources on site B using this header?

Answer 1

The problem is that you didn't save the mysqli connection. Just change your connect to :

$aVar = mysqli_connect('localhost','tdoylex1_dork','dorkk','tdoylex1_dork');

After that include this code in your query:

$query1 = mysqli_query($aVar, "SELECT name1 FROM users
    ORDER BY RAND()
    LIMIT 1");
$aName1 = mysqli_fetch_assoc($query1);
$name1 = $aName1['name1'];

Please note that you have to enclose your connection variables as strings. I hope this helps you.