This commit changes the documentation to advise using
https://github.com/stomp-js/stompjs library on client
side and to configure by default WebSocket without
SockJS as browsers and proxies now have a pretty good
WebSocket support.
Closes gh-30857
This commit improves the documentation for the
`ShallowEtagHeaderFilter`, stating that it is only meant to support a
subset of conditional HTTP requests: GET requests with "If-None-Match"
headers. Other headers and state changing HTTP methods are not supported
here, as the filter only operates on the content of the response and has
no knowledge of the resource being served.
Closes gh-30517