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Posted to bugs@httpd.apache.org by bu...@apache.org on 2006/07/03 14:18:49 UTC
DO NOT REPLY [Bug 39950] New: - Cannot compare two variables
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Summary: Cannot compare two variables
Product: Apache httpd-2
Version: 2.2.0
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P2
Component: mod_rewrite
AssignedTo: bugs@httpd.apache.org
ReportedBy: erik@urbanninja.se
It seems that it is currently not possible to compare two variables in a RewriteCond, e g
RewriteCond %{HTTP_HOST} ^%{OTHER_VARIABLE}$
since the right side pattern cannot contain variables or back-references.
This is a major drawback, since it forces hardcoding.
The same problem appears in RewriteRule, where the left side pattern cannot include variables or back-
references.
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DO NOT REPLY [Bug 39950] - Cannot compare two variables
Posted by bu...@apache.org.
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG�
RELATED COMMENTS THROUGH THE WEB INTERFACE AVAILABLE AT
<http://issues.apache.org/bugzilla/show_bug.cgi?id=39950>.
ANY REPLY MADE TO THIS MESSAGE WILL NOT BE COLLECTED AND�
INSERTED IN THE BUG DATABASE.
http://issues.apache.org/bugzilla/show_bug.cgi?id=39950
rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |WONTFIX
------- Additional Comments From rpluem@apache.org 2006-07-03 20:53 -------
This is because the regular expressions get compiled during configuration time.
Doing so during runtime (which would be required when we would allow
backreferences / variables to be contained in the regex) would hit performance
hard. At least for the RewriteCond case there are some workarounds (not sure how
much performance these regexs are eating):
RewriteCond %{HTTP_HOST} ^%{OTHER_VARIABLE}$
can be replaced with
RewriteCond %{HTTP_HOST}%{OTHER_VARIABLE} ^(.*)\1$
Basicly you must always try to transform your "logical" comparison to one with
the variable parts on the left side and a static regex on the right side. This
may not be always possible or might result in very expensive regex's on the
right side.
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