Issue #13335 - fixes for HttpServletRequest.upgrade #13597
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Closes #13335
This PR prevents
HttpUpgradeHandler.init
being called from within theHttpServletRequest.upgrade
implementation, this should only instantiate theHttpUpgradeHandler
.see https://jakarta.ee/specifications/servlet/6.1/jakarta-servlet-spec-6.1#upgrade-processing
This PR also changes the
HttpServletRequest.upgrade
implementation to automatically set required headers for the upgrade.