[Web基础]URI的字符组成

uric = reserved | unreserved | escaped




 (1) reserved    = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
                    "$" | ","

 (2) unreserved  = alphanum | mark

      mark        = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"

(3) 除以上的字符外，均是：
      escaped     = "%" hex hex
      hex         = digit | "A" | "B" | "C" | "D" | "E" | "F" |
                            "a" | "b" | "c" | "d" | "e" | "f"



 

由上述可知：
当提交的表单中，含有的字符
1.属于情况(3)时，需要UrlEncode；
2.属于情况(1)时，需要UrlEncode，因为作为query的value部分，当然不能有reserved字符；
3.属于情况(2)时，不需要UrlEncode。不过，对(2)的mark字符，有些浏览器选择性地对它们进行了UrlEncode。

参考：http://www.faqs.org/rfcs/rfc2396.html