Fetch HTTP headers with curl

By | 2011/09/23

A simple curl command can fetch HTTP headers from a website. Here’s how it works!


The command is:

$ curl -I domain.com

Example:

stmiller@brahms:~$ curl -I http://scottlinux.com
HTTP/1.1 200 OK
Date: Sat, 24 Sep 2011 02:53:17 GMT
Server: Apache
Strict-Transport-Security: max-age=43200; includeSubDomains
Set-Cookie: bb2_screener_=1316832797+; path=/
X-Pingback: http://scottlinux.com/xmlrpc.php
Set-Cookie: PHPSESSID=erh3jr41d1idkaifote48urph4; path=/
X-Hello: Hello There
Vary: Accept-Encoding
Content-Type: text/html; charset=UTF-8


slashdot.org will give either an x-bender or x-fry header. 🙂 Try it out:

stmiller@brahms:~$ curl -I slashdot.org
HTTP/1.1 200 OK
Server: Apache/1.3.42 (Unix) mod_perl/1.31
SLASH_LOG_DATA: shtml
X-Powered-By: Slash 2.00500120110922.02
X-Fry: It's a widely-believed fact!
X-XRDS-Location: http://slashdot.org/slashdot.xrds
Cache-Control: no-cache
Pragma: no-cache
Content-Type: text/html; charset=utf-8
Content-Length: 91444
Date: Sat, 24 Sep 2011 02:54:00 GMT
X-Varnish: 120240911 120240846
Age: 6
Connection: keep-alive

(Is slashdot really running on apache ver 1.3?!)


Add your own HTTP Header

First, enable Apache mod_headers:

$ sudo a2enmod headers 

Next add your own custom header by adding the following to your virtualhost config file

Header set X-Cool "Yeah!"

Example:

Header set X-Cool "Yeah!"

< VirtualHost *:80 >

	DocumentRoot /var/www
	< Directory / >
...

Cool!

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