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HTTP Status Codes

Each time a user agent requests a URL from a web site, the server replies with a set of HTTP headers;

the requested content follows after them. Most users never see this part of the communication, how-

ever, because web browsers do not normally display them.

If you’ve never seen how these headers look, it’s time to get your feet wet. The easiest way to get started

is to use a web-based tool that does all of the work for you. One such tool is located at

http://www

.seoegghead.com/tools/view-http-headers.php

.

Figure 4-1 shows the results of using this tool for

http://www.cristiandarie.ro

. The status code is

highlighted.

A more convenient way to view these headers is by using a plugin for your browser. One plugin you can

use with Firefox is

LiveHTTPHeaders

(

http://livehttpheaders.mozdev.org/

). For Internet Explorer

you can use

ieHTTPHeaders

(

http://www.blunck.se/iehttpheaders/iehttpheaders.html

).

Figure 4-2 shows

LiveHTTPHeaders

in action.

The part of the HTTP headers you’re predominantly interested in for the purpose of this chapter is the

line containing the

status code

of the request, as indicated in the figure. The most common status code is

200

, which specifies the request was processed by your web server successfully without any surprises,

and that the content the user requested follows.

Figure 4-1

78

Chapter 4: Content Relocation and HTTP Status Codes

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