Question

I am trying to work out how to redirect from my webapp to another server, preserving any paths and GET vars.

eg

www.myapp.com/foo
foo.com

www.myapp.com/foo/bar
foo.com/bar

www.myapp.com/foo?bar=1
foo.com?bar=1

I would idealy just like to use something like

<mvc:view-controller path="/foo/**" view-name="redirect:http://foo.com**" />

Answer 1

I ended up using a filter.

infrastructurally this seems to be the simplest way

filter implementation:

public class DomainRedirectFilter extends OncePerRequestFilter {

    private String destinationDomain;
    private String sourceServletPath;

    @Override
    protected void doFilterInternal(HttpServletRequest request, 
             HttpServletResponse response, FilterChain filterChain)
             throws ServletException, IOException {
        String path = request.getServletPath();
        path = StringUtils.replace(path, getSourceServletPath(), "");
        if (request.getQueryString() != null) {
            path += '?' + request.getQueryString();
        }

        response.setHeader( "Location", getDestinationDomain() + path );
        response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
        response.setHeader( "Connection", "close" );
    }

web.xml

<filter>
    <filter-name>fooDomainRedirectFilter</filter-name>
    <filter-class>com.abc.mvc.util.DomainRedirectFilter</filter-class>
    <init-param>
        <param-name>destinationDomain</param-name>
        <param-value>http://foo.abc.com</param-value>
    </init-param>
    <init-param>
        <param-name>sourceServletPath</param-name>
        <param-value>/foo</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>fooDomainRedirectFilter</filter-name>
    <url-pattern>/foo/*</url-pattern>
    <url-pattern>/foo</url-pattern>
</filter-mapping>

I needed to add 2 url-patterns to allow for

/foo
/foo?id=1
/foo/bar
/foo/bar?id=1