rabbah opened a new issue #4550: restore ability to issue head requests to the controller URL: https://github.com/apache/incubator-openwhisk/issues/4550 The change in this PR https://github.com/apache/incubator-openwhisk/pull/4494/files disabled automatic HEAD responses from the controller. So we need an explicit handler to restore this behavior. This has affected at least one downstream project (https://github.com/apache/incubator-openwhisk-devtools/pull/270).
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