url编码，表单编码和mailto:编码 [英] url encoding, Form encoding and mailto: encoding
问题描述
对于与HTML相关的整个编码问题，我有些困惑.我没有在标头中引用字符集，也没有在XML序言中引用编码.我明白了.让我解释一下.
I am a little bit confused about the whole encoding issues related to HTML. I am not refering to the charset in the headers or encoding in the XML prologue. That I get. Lets me explain.
当"mailto:"与表单中的锚点或提交按钮一起使用时，空格被编码为％20"，而换行/回车/新行/行尾"被编码为％0A.当在值"application/x-www-form-urlencoded"的表单上使用enctype属性时，空格被编码为"+"，并且特殊字符，撇号，百分比和其他符号被转换为其ASCII十六进制等价物.值"application/x-www-form-urlencoded"是URL编码吗?那么，为什么第一个为％20"，第二个为"+".
When the "mailto:" is used along with a anchor or a submit button in a form, white space is encoded as "%20" and "line feed/carriage return/new line/end of line" is encoded as %0A. While when the enctype attribute is used on a form with a value of "application/x-www-form-urlencoded" the white space is encoded as "+" and special characters, apostrophes, percentage and other symbols are converted to their ASCII HEX equivalents. Is the value "application/x-www-form-urlencoded" an URL Encoding? So why "%20" for the first one and "+" for the second.
"mailto:someone@someplace.com?cc=carbon@copy.com&bcc=blind@carbobcopy.org&subject=This%20is%20the%20subject&body=This%20is%20the%body%0AThis%20is%20the%20second%20paragraph"
在上面的示例中，主题中的空白编码为％20，而正文中的换行编码为％0A.
In the above example white space in the subject is encoded as %20 and new line in the body is encoded as %0A.
<form enctype="application/x-www-form-urlencoded"></form>
并且在上面的空白中将被编码为"+".我想念什么吗?
And in the above white space will be encoded to "+". Am I missing something?
谢谢.
推荐答案
URI(如您的mailto示例)应根据RFC 3986进行编码，该规范指定将空格编码为％20.
URIs (like your mailto example) should be encoded according to RFC 3986, which specifies that spaces are to be encoded as %20.
另一方面，根据HTML规范定义的规则，FORM数据的格式被编码为application/x-www-form-urlencoded. (例如，请参见HTML的第17.13.3.3节4.01规范.)这指定空格应翻译为+号.
The format of FORM data, on the other hand, is encoded as application/x-www-form-urlencoded according to the rules defined by the HTML specification. (See, for example, section 17.13.3.3 of the HTML 4.01 specification.) This specifies that spaces are to be translated as + signs.
因此，尽管URI和表单数据之间的百分比编码是相似的，但是空格字符的处理方式却有所不同.
Thus, while percent encoding is similar between URIs and form data, the space character is treated differently.
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