URL encoding: Difference between revisions
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{{draft task}} |
{{draft task}} |
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== What is URL encoding? == |
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In URL encoding, special characters, control characters and extended characters are converted into a percent symbol followed by a two digit hexadecimal code, So a space character encodes into %20 within the string. |
In URL encoding, special characters, control characters and extended characters are converted into a percent symbol followed by a two digit hexadecimal code, So a space character encodes into %20 within the string. |
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The following characters require conversion: |
The following characters require conversion: |
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*ASCII control codes (Character ranges 00-1F hex (0-31 decimal) and 7F (127 decimal). |
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*ASCII symbols (Character ranges 32-47 decimal (20-2F hex)) |
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*ASCII symbols (Character ranges 58-64 decimal (3A-40 hex)) |
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*ASCII symbols (Character ranges 91-96 decimal (5B-60 hex)) |
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*ASCII symbols (Character ranges 123-126 decimal (7B-7E hex)) |
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*Extended characters with character codes of 128 decimal (80 hex) and above. |
*Extended characters with character codes of 128 decimal (80 hex) and above. |
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'''Example''' |
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The string "<code><nowiki>http://foo bar/</nowiki></code>" would be encoded as "<code><nowiki>http%3A%2F%2Ffoo%20bar%2F</nowiki></code>". |
The string "<code><nowiki>http://foo bar/</nowiki></code>" would be encoded as "<code><nowiki>http%3A%2F%2Ffoo%20bar%2F</nowiki></code>". |
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'''See also''' |
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[[URL decoding]] |
[[URL decoding]] |
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Revision as of 15:29, 17 June 2011
URL encoding is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
The task is to provide a function or mechanism to convert a provided string into URL encoding representation.
In URL encoding, special characters, control characters and extended characters are converted into a percent symbol followed by a two digit hexadecimal code, So a space character encodes into %20 within the string.
The following characters require conversion:
- ASCII control codes (Character ranges 00-1F hex (0-31 decimal) and 7F (127 decimal).
- ASCII symbols (Character ranges 32-47 decimal (20-2F hex))
- ASCII symbols (Character ranges 58-64 decimal (3A-40 hex))
- ASCII symbols (Character ranges 91-96 decimal (5B-60 hex))
- ASCII symbols (Character ranges 123-126 decimal (7B-7E hex))
- Extended characters with character codes of 128 decimal (80 hex) and above.
Example
The string "http://foo bar/" would be encoded as "http%3A%2F%2Ffoo%20bar%2F".
See also
Perl
Use standard CGI module: <lang perl>use 5.10.0; use CGI;
my $s = 'http://foo/bar/'; say $s = CGI::escape($s); say $s = CGI::unescape($s);</lang>