commit 27f64c6c245c6114f2a581a3f13c89ba72e1de36
author Maxim Dounin <mdounin@mdounin.ru> Mon Jun 28 18:01:11 2021 +0300
committer Maxim Dounin <mdounin@mdounin.ru> Mon Jun 28 18:01:11 2021 +0300
tree ef50b5f6c6693223082254529d7cad7592c76319
parent adae70470a4397d3e34c500677041e5f43114651

Core: escaping of chars not allowed in URIs per RFC 3986.

Per RFC 3986 only the following characters are allowed in URIs unescaped:

unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
gen-delims    = ":" / "/" / "?" / "#" / "[" / "]" / "@"
sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
              / "*" / "+" / "," / ";" / "="

And "%" can appear as a part of escaping itself.  The following
characters are not allowed and need to be escaped: %00-%1F, %7F-%FF,
" ", """, "<", ">", "\", "^", "`", "{", "|", "}".

Not escaping ">" is known to cause problems at least with MS Exchange (see
http://nginx.org/pipermail/nginx-ru/2010-January/031261.html) and in
Tomcat (ticket #2191).

The patch adds escaping of the following chars in all URI parts: """, "<",
">", "\", "^", "`", "{", "|", "}".  Note that comments are mostly preserved
to outline important characters being escaped.