code: public URI rewriteURI(RequestContext rc) throws URISyntaxException {
          Request request = rc.request();
          String path = request.path();
          if (!path.startsWith(prefix)) {
              return null;
          }
  
          return computeDestinationURI(request, path, proxyTo, prefix);
      }
docs: Computes the URI where the request need to be transferred.
  
  @param rc the request content
  @return the URI
  @throws URISyntaxException if the URI cannot be computed