Sending Success response after JSON request

[Eric Ettes]

Hi all,

I'm currently trying out some messaging with Grails using JSON, and it seems to work pretty good. There's one thing that I don't seem to get right, and that's sending a success response after the JSON request has been processed.

The code consists of two independent applications with a sentJSON and a parseJSON function:

Sender:

    def sendJSON() {

        def url = 'http://localhost:8090/jsonreceiver/parsejson'

        def obj = new TestObject(params)

        def objJson = obj as JSON

        def http = new HTTPBuilder(url)

        http.request(POST, groovyx.net.http.ContentType.JSON) { req ->

            body = objJson.toString()

            response.success = { resp, json ->

                println "Request succesful with status ${resp.status}"

            }

            response.failure = { resp ->

                println "Request failed with status ${resp.status}"

            }

        }

        redirect action: 'edit'

    }

Receiver:

    def parsejson() {

        def incoming = new TestObject(request.JSON)

        response.sendError(200)

    }

The TestObject is converted, sent and rebuilt fine, but what do I need to do to inform the sending application that all went well? I tried to return the response object, but that gave me a 404. Using response.sendError(500) gave me an Http 500 (obviously) so the applications do 'see' each other :-)

Seeing as there's no response.sendSuccess, I'm probably missing something trivial?

Kind regards,

-- 
Eric Ettes
Sent with Sparrow

[Ian Roberts]

On 18/04/2012 11:03, Eric Ettes wrote:
> The TestObject is converted, sent and rebuilt fine, but what do I need
> to do to inform the sending application that all went well? I tried to
> return the response object, but that gave me a 404. Using
> response.sendError(500) gave me an Http 500 (obviously) so the
> applications do 'see' each other :-)
>
> Seeing as there's no response.sendSuccess, I'm probably missing
> something trivial?

If you want just a status code with no response body then you should use
a 204 status code

render status:HTTPServletResponse.SC_NO_CONTENT

If you want to send a 200 code then that needs a body of some kind, so
something like

render [result:"OK"] as JSON

Ian

--
Ian Roberts               | Department of Computer Science
[hidden email]  | University of Sheffield, UK

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[Eric Ettes]

Thanks Ian,

That did the trick, I'm receiving the status message in my success handler, together with a HTTP 200 status!

Kind regards,

-- 
Eric Ettes
Sent with Sparrow

On Wednesday, April 18, 2012 at 12:18 PM, Ian Roberts wrote:

On 18/04/2012 11:03, Eric Ettes wrote:

The TestObject is converted, sent and rebuilt fine, but what do I need

to do to inform the sending application that all went well? I tried to

return the response object, but that gave me a 404. Using

response.sendError(500) gave me an Http 500 (obviously) so the

applications do 'see' each other :-)

Seeing as there's no response.sendSuccess, I'm probably missing

something trivial?

If you want just a status code with no response body then you should use

a 204 status code

render status:HTTPServletResponse.SC_NO_CONTENT

If you want to send a 200 code then that needs a body of some kind, so

something like

render [result:"OK"] as JSON

Ian

--

Ian Roberts | Department of Computer Science

[hidden email] | University of Sheffield, UK

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