https://bz.apache.org/bugzilla/show_bug.cgi?id=69610

            Bug ID: 69610
           Summary: Consider implementing support for
                    upgrade-insecure-requests request header and
                    conditional HSTS
           Product: Tomcat 11
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: ma...@apache.org
  Target Milestone: -------

The upgrade-insecure-requests request header allows a server to enable HSTS for
a user agent even if some of the links still use HTTP providing those resources
are also available over HTTPS by adding the upgrade-insecure-requests CSP
header to the response.

It looks like this should be implementable via the HttpHeaderSecurityFilter
with a little refactoring.

I'm not seeing a need for this at the moment. A search of the Tomcat archives
finds a handful of references to upgrade-insecure-requests but all of them in
HTTP header traces for other issues. I haven't found any evidence that there is
demand for this feature from Tomcat users. I am opening this issue as a way to
track that demand - if any.

[1] https://www.w3.org/TR/upgrade-insecure-requests/

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