75faf698af
This commit refines CORS wildcard processing Javadoc to provides more details on how wildcards are handled for Access-Control-Allow-Methods, Access-Control-Allow-Headers and Access-Control-Expose-Headers CORS headers. For Access-Control-Expose-Headers, it is not possible to copy the response headers which are not available at the point when the CorsProcessor is invoked. Since all the major browsers seem to support wildcard including on requests with credentials, and since this is ultimately the user-agent responsibility to check on client-side what is authorized or not, Spring Framework continues to support this use case. See gh-31168
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