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https://issues.apache.org/jira/browse/WW-5496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17916311#comment-17916311
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Lukasz Lenart commented on WW-5496:
-----------------------------------
Did you try this one?
https://nightlies.apache.org/struts/snapshot/
> Struts filter and HttpServletResponseWrapper
> --------------------------------------------
>
> Key: WW-5496
> URL: https://issues.apache.org/jira/browse/WW-5496
> Project: Struts 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 7.0.0
> Environment: Tomcat 11
> Reporter: Günter Paul
> Priority: Minor
> Fix For: 7.1.0
>
>
> I've been using a servlet filter for a long time. It removes spaces in the
> lines (trim()) and line breaks (only for *.action requests).
> The filter is installed in the web.xml before the struts filter. It works
> very well so far, even with the current Struts 7.0.0-M10 version.
> Until now I was using Tomcat 10. After switching to Tomcat 11, only blank
> pages are displayed.
> If I use a web-application without struts, the filter works fine. Only when
> the Struts filter (StrutsPrepareAndExecuteFilter) is installed does the
> output of the wrapper appear to no longer be included in the output stream.
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