My custom HTTP error message is getting overwritten in php

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.

Why on earth would you put data like this in the response line? Put it in the body of the response (echo it) - HTTP is not designed to work in the way you are attempting to use it. — DaveRandom
– DaveRandom, Commented Jan 18, 2012 at 10:12
@DaveRandom thanks for the response. I am trying to trigger a jquery ajax error . can u plz help me with that . how can i send the error in this case — aWebDeveloper
– aWebDeveloper, Commented Jan 18, 2012 at 11:02
Please add the jQ code that makes the request to your question so we can assist you with correct code — DaveRandom
– DaveRandom, Commented Jan 18, 2012 at 16:30

Mike Causer · Accepted Answer · 2012-01-18 13:01:05Z

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.

answered Jan 18, 2012 at 13:01

Mike Causer

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1 Comment

Evert Over a year ago

And on top of that, the status line should never be relied on. It's intended as a human-readable string only. Code should only ever look at the code.

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