下面是US - ASCII编码字符集中这些函数将采用百分号编码的的可打印字符列表，码值为32到126(十进制)。

Following is a list of printable characters from the US-ASCII coded character set, specifically the octets ranging from 32 to 126 (decimal), that the functions will percent-encode.

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EXSLT定义的str： encode - uri也执行百分号编码，但是与encode - for - uri相比少了5个保留字符。

EXSLT defines STR: encode-uri , which also performs percent-encoding, but for five fewer reserved characters compared to encode-for-uri .

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由于百分号(%)本身可以是URL编码的，所以攻击者可以向服务器提交一个精心制作的、基本上是双重编码的请求。

Because the percent sign (%) itself can be URL encoded, an attacker can submit a carefully crafted request to a server that is basically double-encoded.

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