I am working with a fellow who runs an eCommerce shop. The transaction resolution comes in on a querystring.
I do not yet know what web server software is being used, nor if any security appliance/software is installed.
One of the values in the querystring starts with the @ character.
We know the web server gets this as there entries in the web server's access log that shows thing value is present.
It is not available in PHP's $_GET array.
We are trying to get an idea of where this value, and it's key, is getting discarded.
Is there a known problem with (actual server software being used not yet known) web server software discarding a key/value if the value has the @ character in the querystring?