URL中保留的分号是什么？

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问题描述

 保留= gen-delims / sub-delims 
 
 gen-delims =：///？ /＃/[/]/@
 
 sub-delims =！ /$/& /'/（/）
 /*/+/ /=

;的保留目的是什么？的URI中的分号？对于这个问题，其他子分隔符的目的是什么（我只知道&，+和=的目的）？

换句话说，它是保留的，所以想要URL中的某个分隔列表的人可以安全地使用; 作为分隔符，即使零件包含; ，只要内容是百分号编码的。换句话说，您可以这样做：

  foo; bar; baz％3bqux

并将其解释为三个部分： foo ， code>， baz; qux 。如果分号不是保留字符，; 和％3b 将是等效的，因此URI将不正确解释为四个部分： foo ， bar ， baz qux 。

The RFC 3986 URI: Generic Syntax spec lists a semicolon as a reserved (sub-delim) character:
reserved    = gen-delims / sub-delims

gen-delims  = ":" / "/" / "?" / "#" / "[" / "]" / "@"

sub-delims  = "!" / "$" / "&" / "'" / "(" / ")"
              / "*" / "+" / "," / ";" / "="
What is the reserved purpose of the ";" of the semicolon in URIs?  For that matter, what is the purpose of the other sub-delims (I'm only aware of purposes for "&", "+", and "=")?
 解决方案 
There is an explanation at the end of section 3.3.
In other words, it is reserved so that people who want a delimited list of something in the URL can safely use ; as a delimiter even if the parts contain ;, as long as the contents are percent-encoded. In other words, you can do this:
foo;bar;baz%3bqux
and interpret it as three parts: foo, bar, baz;qux. If semi-colon were not a reserved character, the ; and %3bwould be equivalent so the URI would be incorrectly interpreted as four parts: foo, bar, baz, qux.
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