CODEWITHSUNDEEP
phpjson
seberik
seberik

Reputation: 415

JSON Response headers

The following headers seem to be recommended using when outputing JSON:

header('Cache-Control: no-cache, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Content-type: application/json');

What is the purpose of the Expires header when Cache-control is set to no-cache, must-revalidate?

Upvotes: 3

Views: 5909

Answers (2)

Ashish Rathore
Ashish Rathore

Reputation: 1

The first two headers prevent the browser from caching the response (a problem with IE and GET requests) and the third sets the correct MIME type for JSON.

Upvotes: 0

blue
blue

Reputation: 1949

This resolves some browser and caching proxies issues.

It seems like there are some of these that do not understand some headers and/or are configured not to, so it is just a workaround trying to be compatible with a little more of the end users' browser and caching proxies in the middle.

Upvotes: 2

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