https://bz.apache.org/bugzilla/show_bug.cgi?id=69365

            Bug ID: 69365
           Summary: Expose option for WebResource to determine it is
                    read-only/read-write for DefaultServlet/WebdavServlet
           Product: Tomcat 9
           Version: 9.0.95
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: micha...@apache.org
  Target Milestone: -----

Both servlets have the method determineMethodsAllowed(). It considers the
global flag readOnly, but if the flag is false AND a resource set is explicitly
mounted as readOnly=true the modification operation like PUT, DELETE, etc. will
fail.

Ideally we could do:
if (!readOnly || !resource.isReadOnly()) {
        methodsAllowed.append(", DELETE");
        if (!resource.isDirectory()) {
                methodsAllowed.append(", PUT");
        }
}

References:
* https://lists.apache.org/thread/od5b3pn4r39dznls542b3y37f3p5zz39
* https://lists.apache.org/thread/6tz7l2f08z2fs8mmkztxvjxcdqv5642n

Maybe there are better ideas to solve that.

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