Re: Howto: RPC with Http GET

good hint!

thanks for sharing
Michael

On Aug 28, 11:29 am, George Georgovassilis
<g.georgovassi...@gmail.com> wrote:
> There've been some requests to perform RPC invocations with HTTP GET,
> as the response is cacheable by the browser (and if you believe the
> word on the net, it's faster [1] than POST).
>
> I've written a wrapup on how to get it done [2], the essentials in a
> nutshell:
>
> Given a service you want to make GETable:
>
>     interface GeoService{
>       String[] getListOfPlaces(String countryCode);
>       double[] getGeoCoordinatesForPlace(String placeCode);
>     }
>
> On the client side, you need to provide the service proxy with a
> request builder that performs GET requests:
>
> public void getGeoCoordinates(final String placeCode, final
> AsyncCallback callback){
>
>  ((ServiceDefTarget)geoService).setRpcRequestBuilder(new
> RpcRequestBuilder(){
>  @Override
>  protected RequestBuilder doCreate(String serviceEntryPoint) {
>
>    return new RequestBuilder(RequestBuilder.GET, "/myapp/geoservice?
> placecode="+placeCode);
>
>    }});
>
>   geoService.read(placeCode, callback);
>
> }
>
> On the server side, you need to create a servlet that does _not_
> extend RemoteServiceServlet but uses the GWT RPC utilities directly:
>
> public void doPost(HttpServletRequest request, HttpServletResponse
> response)throws Exception{
>     String placeCode = request.getParameter("placecode");
>         Method method = geoService.getClass().getMethod("read", new
> Class[]{String.class});
>         double[] coordinates = geoService.read(placeCode);
>         String sPayload = RPC.encodeResponseForSuccess(method,
> coordinates);
>         byte[] payload;
>         payload = sPayload.getBytes("utf-8");
>         response.setHeader("Content-Disposition", "attachment");
>         response.setContentType("application/json;charset=utf-8");
>         response.setContentLength(payload.length);
>         ServletOutputStream stream = response.getOutputStream();
>         stream.write(payload);
>     }
>
> [1] Yahoo Exceptional Performance Blog, Use GET for Ajaxhttp://developer.yahoo.com/performance/rules.html
>
> [2] GWT RPC calls with Http GET methodhttp://georgovassilis.blogspot.com/2010/08/gwt-rpc-calls-with-http-ge...

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