https://issues.apache.org/bugzilla/show_bug.cgi?id=57178

            Bug ID: 57178
           Summary: Add CorsFilter configuration option to allow requests
                    with Origin "null"
           Product: Tomcat 8
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: gzurow...@apache.org

CorsFilter does not allow requests with the Origin header set to string "null".
It treats such requests as invalid CORS requests. The current implementation
seems too restrictive and prevents some common use cases: The Origin header is
set to "null" when the browser cannot determine the origin of a request. This
is the case when opening local files in the browser. Common uses cases are
local development with remote services and testing hybrid mobile applications.
To support such use cases, a new configuration option could be introduced where
administrators could explicitly allow CORS requests with "null" origins.

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