curl: If-Modified-Since Command Linux / Unix Example

curl: If-Modified-Since Command Linux / Unix Example

TTP protocol allows a client to specify a time condition for the document it requests. It is If-Modified-Since or If-Unmodified-Since. How do I use curl Unix/Linux command line option to test a server with If-Modified-Since condition and validate Last-Modified settings?

You can use curl command to see if a copy (http resources such as text/html or image/png) that they hold is still valid. However, this will only work if response has a Last-Modified header. You can send a Last-Modified header using web server or your web application.

Step #1: Find out if response has a Last-Modified header

Type the following curl command:

curl --silent --head http://imagia.in/foo/bar/image.png curl --silent --head http://imagia.in/foo/help.html
OR

curl I http://imagia.in/foo/bar/image.png curl I http://imagia.in/foo/help.html

In this example, note down the Last-Modified headers in the response to this HEAD request:
$ curl -I http://www.imagia.in/faq/
Sample outputs:

HTTP/1.1 200 OK

Server: nginx

Date: Tue, 11 Dec 2012 10:10:24 GMT

Content-Type: text/html; charset=UTF-8

Connection: keep-alive

X-Whom: l2-com-cyber

Last-Modified: Tue, 11 Dec 2012 10:10:23 GMT

Cache-Control: max-age=299, must-revalidate

Vary: Cookie

X-Pingback: http://www.imagia.in/faq/xmlrpc.php

X-Galaxy: Andromeda-1

Vary: Accept-Encoding

Sample outputs:

The syntax is as follows to send If-Modified-Since header using the curl command line:
$ curl -I --header 'If-Modified-Since: DATE-FORMAT-HERE' http://imagia.in/foo/bar/image.png
$ curl -I --header 'If-Modified-Since: Tue, 11 Dec 2012 10:10:24 GMT' http://www.imagia.in/faq/

Sample outputs:

HTTP/1.1 304 Not Modified
Server: nginx
Date: Tue, 11 Dec 2012 10:12:11 GMT
Connection: keep-alive
X-Whom: l2-com-cyber
Vary: Cookie
Last-Modified: Tue, 11 Dec 2012 10:10:23 GMT
X-Galaxy: Andromeda-1
Vary: Accept-Encoding

The resource sends a 304 Not Modified response, indicating that it supports Last-Modified validation.