>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
>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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