flow: Websocket in combination with AJP broken behind reverse-proxy in 23.2.

Description of the bug

Previously websocket connections could be forwarded by using a separate location in the httpd configuration like so <Location /web/vaadinServlet/> allowing this connection to be used with http / websockets - after 23.2 the websockets connection is not routed tho /web/vaadinServlet/ anymore, instead it goes straigth to the /web/?v-r=push... where the connection can’t be established because /web/** forwards to AJP, which DOES not support websockets.

Example exception:

'HTTP upgrade is not supported by this protocol' Requested resource was: '/web/?v-r=push&v-uiId=1&v-pushId=0ce8ff89-eae1-4612-9a12-3383167a2d5b&X-Atmosphere-tracking-id=0&X-Atmosphere-Framework=3.1.2-javascript&X-Atmosphere-Transport=websocket&X-Atmosphere-TrackMessageSize=true&Content-Type=application/json;%20charset=UTF-8&X-atmo-protocol=true'

Expected behavior

Websockets should be handled by a separat endpoint /web/vaadinServlet/ like done since V8.

Minimal reproducible example

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Versions

• Vaadin / Flow version: 23.2
• Java version: 11
• OS version: xx
• Browser version (if applicable):
• Application Server (if applicable):
• IDE (if applicable):