URL中如果出现非ASCII字符时需要进行编码（encode）

最新推荐文章于 2021-02-19 14:18:46 发布

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最新推荐文章于 2021-02-19 14:18:46 发布

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文章标签： url encoding byte each

本文链接：https://blog.youkuaiyun.com/oney139/article/details/6115924

本文详细介绍了URL中哪些字符需要进行编码及其编码方式。指出仅特定的ASCII字符集可用于URL，包括字母、数字及部分标点符号。对于超出此范围的字符，如文件名中的特殊符号等，必须使用百分号编码。

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当URL中的字符是什么的时候需要编码（encode）呢？如下所述：

characters used in URLs must come from a fixed subset of ASCII, specifically:

The capital letters A-Z
The lowercase letters a-z
The digits 0-9
The punctuation characters - _ . ! ~ * ' (and ,)

The characters : / & ? @ # ; $ + = and % may also be used, but only for their specified purposes. If these characters occur as part of a filename, they and all other characters should be encoded.

The encoding is very simple. Any characters that are not ASCII numerals, letters, or the punctuation marks specified earlier are converted into bytes and each byte is written as a percent sign followed by two hexadecimal digits. Spaces are a special case because they're so common. Besides being encoded as %20, they can be encoded as a plus sign (+). The plus sign itself is encoded as %2B. The / # = & and ? characters should be encoded when they are used as part of a name, and not as a separator between parts of the URL.