Question

So I using cakephp and using ajax to submit forms. In some cases it returns a custom error.

For example, at one point it can be like:

Failed to load resource: the server responded with a status of 412 
([{"field":"PaymentCardholderName","message":"Please enter CardHolder's Name."},
{"field":"PaymentCardNumber","message":"Please enter Card Number."},
{"field":"PaymentCvvNumber","message":"Please enter CVV Number."},
{"field":"PaymentBillingAddress","message":"Please enter your Billing Address"}])

Here is the server logic in case anyone needs it

header('HTTP/1.1 412 ' . json_encode($error));

when I open this up locally I see my custom error message. When I deploy it to a remote server I just see my custom error message overwritten

Failed to load resource: the server responded with a status of 412 
(Precondition Failed)

It must be some configuration, but I can’t find it.

Answer 1

Additionally, instead of presuming HTTP/1.1

Do this:

header($_SERVER["SERVER_PROTOCOL"]." 412 Precondition Failed");

Instead of this:

header("HTTP/1.1 412 Precondition Failed");
header("HTTP/1.0 412 Precondition Failed");

Why? Because $_SERVER["SERVER_PROTOCOL"] gives you either HTTP/1.1 or HTTP/1.0 based on your browser. If you use the wrong one, apache might add unexpected content to the response. eg. a 4 digit hex code at the start (checksum?), and a trailing zero.