字符串进行Url编码解码，Html编码，用户在HTTP请求中参数格式化使用。

The string is encoded and decoded by Url, encoded by Html, and formatted by the user in the HTTP request.

• Url Encode

Returns a percent-encoded version of the passed-in string

• Url Decode

Returns a decoded version of the percent-encoded passed in string

• Html Encode

Returns the < &gt...etc encoding for strings between HTML elements.

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