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Cross-Origin Opener Policy Interceptor


Interceptor that implements Cross-Origin Opener Policy on incoming requests.

COOP is a security mitigation that lets developers isolate their resources against side-channel attacks and information leaks. The COOP response header allows a document to request a new browsing context group to better isolate itself from other untrustworthy origins. Separating browsing contexts is necessary because at least two types of attacks are possible when a document shares a browsing context group and possibly an operating system process with cross-origin documents:

The COOP header can have one of 3 values:

If the COOP values are the same, and the origins of the documents match the relationship declared in the COOP header value, documents can interact with each other. Otherwise, if at least one of the documents sets COOP, the browser will create a new browsing context group severing the link between the documents. Sites can use same-origin-allow-popups to allow popups they open to be in their browsing context group (unless the popup’s own COOP prevents this).

COOP is now supported by all major browsers. More information about COOP.



<action  name="someAction" class="com.examples.SomeAction">
    <interceptor-ref name="defaultStack">
        <param name="coop.exemptedPaths">/path1,/path2,/path3</param>
        <param name="coop.mode">same-origin</param>
    <result name="success">good_result.ftl</result>