gistfile1.java

  //instead of using WS.url("http://www.google.com") use new CustomRequestHeader(url)   
  
  
  
  class CustomRequestHolder extends WSRequestHolder {

    public CustomRequestHolder(String url) { super(url); }
    
    @Override
    public Promise<Response> execute(String method) {
        WSRequest req = new WSRequest(method).setUrl(getUrl())
                .setHeaders(getHeaders())
                .setQueryParameters(new FluentStringsMap(getQueryParameters()))
                .setVirtualHost("some virtual host");
        try {
            Method privateMethod = WSRequestHolder.class.getDeclaredMethod("execute", play.libs.WS.WSRequest.class);
            privateMethod.setAccessible(true);
            return (Promise<Response>) privateMethod.invoke(this, req);
        } catch (Exception e) {
            throw new RuntimeException(e);
        } 
    } 
}