HTML and CSS Reference
This URL actually references the resource named compute on the
www.calculator.com server and passes the string 3/4 to it, as delineated
by the question mark ( ? ). Presumably, the resource is a server-side pro-
gram that performs some arithmetic function on the passed value and
returns a result.
Unsafe characters are those that have no special meaning within the
URL but may have a special meaning in the context in which the URL is
written. For example, double quotes ( "" ) delimit URL attribute values in
tags. If you were to include a double quotation mark directly in a URL,
you would probably confuse the browser. Instead, you should encode
the double quotation mark as %22 to avoid any possible conflict.
Table 6-1 shows other reserved and unsafe characters that should al-
ways be encoded.
Table 6-1. Reserved and unsafe characters and their URL