Am 10.02.2016 um 15:23 schrieb Rémy Maucherat:
2016-02-10 15:06 GMT+01:00 Joe Aldrich <jaldr...@kimobility.com>:
Am 29.01.2016 15:34, schrieb Joe Aldrich:
Hello,
I am using Tomcat 8.0.28 on Windows 10 and am having a problem with
the Rewrite Value. I must include the escaped form of an ampersand
'%26' in the output URL.
My rewrite.config has the following:
RewriteCond %{QUERY_STRING} ^(.*&)?SCID=8(&.*)?$ RewriteRule
^/(product|specs|avail-options|avail-category)\.php$
/Product.action?select=Model+4+\%26+4C [R=301,L,NE]
I am escaping the percent sign with a backslash, and I have tried
using the NE flag. However, Tomcat always is treating the percent
symbol as a back reference to the above RewriteCond. If I don't have a
second capture group, then I get a 500 error from a
NullPointerException.
The current tomcat code does not allow escaping of percent or dollar sign.
The parser just looks for percent (or dollar) and applies it either as a
backreference (when it is followed by a digit), or a map.
I have not found any indication, that escaping is possible with httpd.
Could you provide a link to the doc, that states it is possible?
In Apache mod_rewrite it is possible per this documentation:
https://httpd.apache.org/docs/2.2/mod/mod_rewrite.html#quoting
Ok, I added an item for that since the mod_rewrite behavior should be
implemented:
https://bz.apache.org/bugzilla/show_bug.cgi?id=58988
The fix will be included in 9.0.0.M4 and 8.0.33. The syntax will be the
same as with httpd 2.2 using a backslash to quota a percent sign.
@Joe, could you test the current trunk for 8 or 9?
Regards,
Felix
Rémy
If you are willing to build tomcat yourself, you could try the attached
patch, which will allow escaping of percent signs by specifying them as %%.
Your example would thus look like
"/Product.action?select=Model+4+%%26+4C".
Regards,
Felix
I will look into applying the patch as I need to be able to redirect to
URLs that contain %26 in the query string.
Much thanks,
Joe
I was working with the documentation on this page:
http://tomcat.apache.org/tomcat-8.0-doc/rewrite.html
The desired output URL would be:
http://www.domain.com/Product.html?select=Model+4+%26+4C
In the example given for the NE flag on the page reference above, the
percent sign is escaped by a backslash to prevent it from being
treated as a back-reference. This is not working for me. Instead I
get:
http://www.domain.com/Product.action?select=Model+4+\null6+4C
Where the "null" is due to an empty second back-reference. I believe
this is a bug in that it is not escaping the percent sign (making it
impossible to create the %26 in the redirect URL). Or am I
misunderstanding something here?
As a side question, shouldn't an empty back-reference be blank instead
of adding 'null' to the URL?
Joseph B Aldrich
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