Perl Tutorial: Server-Side Includes (Page 2)

Internet & World Wide Web How to Program, 3/e
	ISBN: 0-13-145091-3 © 2004 pages: 1420 Order

This tutorial shows how to use Perl server-side includes (SSIs) to add dynamic content to a Web page. In particular, we demonstrate a Web page hit counter. The tutorial is intended for students and professionals who are already familiar with Perl programming.

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[Note: This tutorial is an excerpt (Section 25.6) of Chapter 25, Perl, from our textbook Internet & World Wide Web How to Program, 3/e. This tutorial may refer to other chapters or sections of the book that are not included here. Permission Information: Deitel, Harvey M. and Paul J., INTERNET & WORLD WIDE WEB HOW TO PROGRAM, 3/E, ©2004, pp.866-870. Electronically reproduced by permission of Pearson Education, Inc., Upper Saddle River, New Jersey.]

25.6 Server-Side Includes (Continued)

Figure 25.3 implements a Web page hit counter. Each time a client requests the document, the counter is incremented by 1. The Perl script fig25_15.pl manipulates the counter.

Fig. 25.3 Incorporating a Web-page hit counter and displaying environment variables, using server-side includes.
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
2 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
3
4 <!-- Fig. 25.14: fig25_14.shtml -->
5
6 <html>
7 <head>
8 <title>Using Server-Side Includes</title>
9 </head>
10
11 <body>
12 <h3 style = "text-align: center">
13 Using Server-Side Includes
14 </h3>
15
16 <!--#EXEC CGI="/cgi-bin/fig25_15.pl" --><br />
17
18 The Greenwich Mean Time is
19 <span style = "color: blue">
20 <!--#ECHO VAR="DATE_GMT" -->.
21 </span><br />
22
23 The name of this document is
24 <span style = "color: blue">
25 <!--#ECHO VAR="DOCUMENT_NAME" -->.
26 </span><br />
27
28 The local date is
29 <span style = "color: blue">
30 <!--#ECHO VAR="DATE_LOCAL" -->.
31 </span><br />
32
33 This document was last modified on
34 <span style = "color: blue">
35 <!--#ECHO VAR="LAST_MODIFIED" -->.
36 </span><br />
37
38 Your current IP Address is
39 <span style = "color: blue">
40 <!--#ECHO VAR="REMOTE_ADDR" -->.
41 </span><br />
42
43 My server name is
44 <span style = "color: blue">
45 <!--#ECHO VAR="SERVER_NAME" -->.
46 </span><br />
47
48 And I am using the
49 <span style = "color: blue">
50 <!--#ECHO VAR="SERVER_SOFTWARE" -->
51 Web Server.
52 </span><br />
53
54 You are using
55 <span style = "color: blue">
56 <!--#ECHO VAR="HTTP_USER_AGENT" -->.
57 </span><br />
58
59 This server is using
60 <span style = "color: blue">
61 <!--#ECHO VAR="GATEWAY_INTERFACE" -->.
62 </span><br />
63
64 <br /><br />
65 <div style = "text-align: center;
66 font-size: xx-small">
67 <hr />
68 This document was last modified on
69 <!--#ECHO VAR="LAST_MODIFIED" -->.
70 </div>
71 </body>
72 </html>

executes the fig25_15.pl script, using the EXEC command. Before the XHTML document is sent to the client, the SSI command is executed, and any script output is sent to the client.

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