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HTML URL Encode - Html5 基础教程 - IT书包
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HTML URL Encode
### What is URL Encoding According to RFC 3986, the characters in a URL only limited to a defined set of reserved and unreserved US-ASCII characters. Any other characters are not allowed in a URL. But URL often contains characters outside the US-ASCII character set, so they must be converted to a valid US-ASCII format for worldwide interoperability. URL-encoding, also known as percent-encoding is a process of encoding URL information so that it can be safely transmitted over the internet. To map the wide range of characters that is used worldwide, a two-step process is used: - At first the data is encoded according to the UTF-8 character encoding. - Then only those bytes that do not correspond to characters in the unreserved set should be percent-encoded like %HH, where HH is the hexadecimal value of the byte. For example, the string: **François** would be encoded as: **Fran%C3%A7ois** Ç, ç (c-cedilla) is a Latin script letter. ### Reserved Characters Certain characters are reserved or restricted from use in a URL because they may (or may not) be defined as delimiters by the generic syntax in a particular URL scheme. For example, forward slash / characters are used to separate different parts of a URL. If data for a URL component contains character that would conflict with a reserved set of characters, which is defined as a delimiter in the URL scheme then the conflicting character must be percent-encoded before the URL is formed. Reserved characters in a URL are: <table class="data url-encoding"><tbody><tr><td><code>!</code></td><td><code>#</code></td><td><code>$</code></td><td><code>&</code></td><td><code>'</code></td><td><code>(</code></td><td><code>)</code></td><td><code>*</code></td><td><code>+</code></td><td><code>,</code></td><td><code>/</code></td><td><code>:</code></td><td><code>;</code></td><td><code>=</code></td><td><code>?</code></td><td><code>@</code></td><td><code>[</code></td><td><code class="plain">]</code></td></tr><tr><td><code>%21</code></td><td><code>%23</code></td><td><code>%24</code></td><td><code>%26</code></td><td><code>%27</code></td><td><code>%28</code></td><td><code>%29</code></td><td><code>%2A</code></td><td><code>%2B</code></td><td><code>%2C</code></td><td><code>%2F</code></td><td><code>%3A</code></td><td><code>%3B</code></td><td><code>%3D</code></td><td><code>%3F</code></td><td><code>%40</code></td><td><code>%5B</code></td><td><code class="plain">%5D</code></td></tr></tbody></table> ### Unreserved Characters Characters that are allowed in a URL but do not have a reserved purpose are called unreserved. These include uppercase and lowercase letters, decimal digits, hyphen, period, underscore, and tilde. The following table lists all the unreserved characters in a URL: <table class="data url-encoding"><tbody><tr><td><code>A</code></td><td><code>B</code></td><td><code>C</code></td><td><code>D</code></td><td><code>E</code></td><td><code>F</code></td><td><code>G</code></td><td><code>H</code></td><td><code>I</code></td><td><code>J</code></td><td><code>K</code></td><td><code>L</code></td><td><code>M</code></td><td><code>N</code></td><td><code>O</code></td><td><code>P</code></td><td><code>Q</code></td><td><code>R</code></td><td><code>S</code></td><td><code>T</code></td><td><code>U</code></td><td><code>V</code></td><td><code>W</code></td><td><code>X</code></td><td><code>Y</code></td><td><code class="plain">Z</code></td></tr><tr><td><code>a</code></td><td><code>b</code></td><td><code>c</code></td><td><code>d</code></td><td><code>e</code></td><td><code>f</code></td><td><code>g</code></td><td><code>h</code></td><td><code>i</code></td><td><code>j</code></td><td><code>k</code></td><td><code>l</code></td><td><code>m</code></td><td><code>n</code></td><td><code>o</code></td><td><code>p</code></td><td><code>q</code></td><td><code>r</code></td><td><code>s</code></td><td><code>t</code></td><td><code>u</code></td><td><code>v</code></td><td><code>w</code></td><td><code>x</code></td><td><code>y</code></td><td><code class="plain">z</code></td></tr><tr><td><code>0</code></td><td><code>1</code></td><td><code>2</code></td><td><code>3</code></td><td><code>4</code></td><td><code>5</code></td><td><code>6</code></td><td><code>7</code></td><td><code>8</code></td><td><code>9</code></td><td><code>-</code></td><td><code>_</code></td><td><code>.</code></td><td><code>~</code></td><td colspan="12"></td></tr></tbody></table> ### URL Encoding Converter The following converter encodes and decodes the characters according to RFC 3986. <iframe style="width:100%; height:160px; border:none;float:left" src="http://example.itshubao.com/inexample/425.html"></iframe> Enter some character and click on encode or decode button to see the output.
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