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The "Cookies" page has been changed by KonstantinKolinko:
https://wiki.apache.org/tomcat/Cookies?action=diff&rev1=44&rev2=45

Comment:
Add link to BZ 57896

   :: Invalid syntax will result in a user-data log entry and cookies being 
dropped rather than throwing of an IAE. Application impact is that requests 
with an invalid Cookie header will now be dispatched to the application. 
"Dropping a cookie" means an invalid cookie will not appear in the list 
returned by !HttpServletRequest#getCookies(). An application will still be able 
to access the original Cookie header and may perform its own parsing.
  
   P4 Ensure that the cookie header is always available for the application to 
parse manually.::
-  :: Stop modifying the header in-situ as part of the de-escaping process so 
that an application can elect to perform its own parsing by calling 
getHeader("Cookie"). Eliminate the need for the PRESERVE_COOKIE_HEADER property 
that currently controls whether a copy of the header is made if modifications 
are needed. Perform de-escaping during the copy needed to convert the 
!MessageBytes to the String in Cookie#value, possibly during any conversation 
process needed to handle UTF-8.
+  :: Stop modifying the header in-situ as part of the de-escaping process 
([[https://issues.apache.org/bugzilla/show_bug.cgi?id=57896|Bug 57896]]) so 
that an application can elect to perform its own parsing by calling 
getHeader("Cookie"). Eliminate the need for the PRESERVE_COOKIE_HEADER property 
that currently controls whether a copy of the header is made if modifications 
are needed. Perform de-escaping during the copy needed to convert the 
!MessageBytes to the String in Cookie#value, possibly during any conversation 
process needed to handle UTF-8.
  
  === Impact of proposal on existing issues ===
  ||<:10%>'''Issue'''||Impact||

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