Extron electronic IPL T S manual URL encoding, Reserved characters

Figure 4-7b — Browser view of previous HTML source code

NBefore 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.

IPL T S Series • Communication and Control 4-23