mod_cgi/5758: QUERY_STRING-UNESCAPED returns many characters prefixed with a \ (backslash)

[Philip Hobson <ph...@hcidata.co.uk>]

>Number:         5758
>Category:       mod_cgi
>Synopsis:       QUERY_STRING-UNESCAPED returns many characters prefixed with a \ (backslash)
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Mon Feb 14 15:30:00 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     phil@hcidata.co.uk
>Release:        1.3.11
>Organization:
apache
>Environment:
UNIX and Windows/98
>Description:
A URI with a query string of [abc] is urlencoded as 
  uri?%5Babc%5D

The QUERY_STRING_UNESCAPED variable is set to \[abc\]
I cannot find any documentation about QUERY_STRING_UNESCAPED
and would have expected QUERY_STRING_UNESCAPED to be set to [abc].
Not all urlencoded characters will be preceeded by a \.  "=+" are 
unescaped without the \ (ie 3D%2B becomes "=+") but urlencoded {} (%7B%7D)
is held in QUERY_STRING_UNESCAPED as \{\}.    
 
>How-To-Repeat:
Use http://www.hcidata.co.uk/testenvi.htm

This will submit a form (method=GET) with many non-alphanumeric characters.
The next html page uses SSIs to echo various environmental variables such as
QUERY_STRING_UNESCAPED 
>Fix:

>Release-Note:
>Audit-Trail:
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