Tue Jan 21 2020 03:50:47 UTC
It's not a bug, it's a feature.
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ID Product Comp Assignee Status Resolution Summary Changed
53627 Tomcat 7 Catalina dev RESO DUPL Content-Type header not written after dispatch via AsyncContext 2012-08-14
One bug found.

as

File a new bug in the "Catalina" component of the "Tomcat 7" product