$_SERVER['HTTP_ORIGIN'] doesn't work
php
Solution
The `Origin` header isn't sent by all browsers.
Depending what you're trying to do, another option is to use the `Referer` header:
echo $_SERVER['HTTP_REFERER'];
By the way, note that request headers are ultimately controlled by the user, so can't be fully trusted.
Problem
When I use `$_SERVER['HTTP_ORIGIN']`. ``` echo $_SERVER['HTTP_ORIGIN'] ; ``` Return Notice: Undefined index: HTTP_ORIGIN in D:\xampp\htdocs\safe\test.php on line 12 What is Wrong?!