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IPL T S Series • Communication and Control
Figure 4-7b — Browser view of previous HTML source code
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Before attempting to develop new Web pages, the user should have a working
knowledge of JavaScript, HTML, and SSI.
URL encoding
URL encoding is the method of using ASCII hexadecimal characters to display
specific characters in a URL. URL encoding is used for several reasons. On some
operating systems, certain characters are unsafe or not available, and others are
reserved by the HTML or URL specification. URL encoding is used to ensure
compatibility and functionality with most Internet browsers. As a general rule, use
the URL hexadecimal encoding method shown on the following page when these
characters appear in your URLs.
The following types of characters do not require encoding in a URL.
Alphanumerics
Special characters
Reserved characters
0-9 a-z A-Z
$ _ _ . + ! * ( ) ,
; / ? : @ = &
When used for their reserved purposes, these
characters do not require encoding within a URL.
Reserved characters
Reserved characters should not be encoded when they appear in their conventional
meaning in a URL. For example, do not encode the slash (/) when using it as part
of the URL syntax. Only encode unsafe characters (defined below) in your URLs.
The following table lists reserved characters.