Url Encoding

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http://www.blooberry.com/indexdot/html/topics/urlencoding.htm
"Reserved characters"
     Why: URLs use some characters for special use in defining their syntax. 
            When these characters are not used in their special role inside a
URL, they need to be encoded.
Characters:
CharacterCode
Points
(Hex)		 Code
Points
(Dec)
 Dollar ("$")
             Ampersand ("&amp")

             Plus ("+")

             Comma (",")

             Forward slash/Virgule ("/")

             Colon (":")

             Semi-colon (";")

             Equals ("=")

             Question mark ("?")
 'At' symbol ("@")
 24
26
2B
2C
2F
3A
3B
3D
3F
40		 36
38
43
44
47
58
59
61
63
64
"Unsafe characters"
     Why: Some characters present the possibility of being 
            misunderstood within URLs for various reasons. These characters
should also always be encoded.
Characters:
CharacterCode
Points
(Hex)		 Code
Points
(Dec)		Why encode?
Space2032 Significant sequences of spaces may be lost in some uses (especially multiple spaces)
Quotation marks
'Less Than' symbol ("<")
'Greater Than' symbol (">")		 22
3C
3E		34
60
62		 These characters are often used to delimit URLs in plain text.
'Pound'(sharp) character ("#") 2335 This is used in URLs to indicate where a fragment identifier (bookmarks/anchors in HTML) begins.
Percent character ("%") 2537 This is used to URL encode/escape other characters, so it should itself also be encoded.
Misc. characters:
                   Left Curly Brace ("{")

                   Right Curly Brace ("}")

                   Vertical Bar/Pipe ("|")

                   Backslash ("\")

                   Caret ("^")

                   Tilde ("~")

                   Left Square Bracket ("[")

                   Right Square Bracket ("]")
   Grave Accent ("`")
7B
7D
7C
5C
5E
7E
5B
5D
60
123
125
124
92
94
126
91
93
96		 Some systems can possibly modify these characters.




 How are characters URL encoded?

    URL encoding of a character consists of a "%" symbol,
    followed by the two-digit hexadecimal representation (case-insensitive)
    of the ISO-Latin code point for the
    character.

    

    
Example
  • Space = decimal code point 32 in the ISO-Latin set.
  • 32 decimal = 20 in hexadecimal
  • The URL encoded representation will be "%20"
Retrieved from "http://www.fxparlant.net/Url_Encoding"
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