Open
Description
Spring doesn't parse the "by" parameter of the Forwarded header in ForwardedHeaderFilter.
According to RFC 7239:
The "by" parameter is used to disclose the interface where the request came in to the proxy server.
I think it should override getLocalAddr/getLocalPort of the HttpServletRequest: https://jakarta.ee/specifications/servlet/6.0/apidocs/jakarta.servlet/jakarta/servlet/servletrequest#getLocalAddr()
The syntax of a "by" value is the same of the "for" parameter.
Support for the "for" parameter has been added as requested in #23260