NoJson found on an http request on play 2.3.2 - json

Question

i'm writing a Play 2.3.2 application using Scala.
In my controller i had a method which get the json object from the request.
The implementation is like the following:
def firstTags = Action.async { request =>
def elaborate(n: Int): Future[Result] = {//some implementation}
//get the json Object
val jsonObject = request.body.asJson
//parse the json object
jsonObject match {
case Some(json) => json \ "number" match {
case x: JsNumber => elaborate(x.as[Int])
case _ => Future{BadRequest}
}
case None => Future{BadRequest("Need a Json")}
}
}
In my route files i had:
GET /recommendation/statistic/first #recommendationsystem.controllers.manager.StatisticsController.firstTags
When i try to call the method with the curl i get always a "Need a Json" response.
I call my server with curl like the following:
curl -H "Accept: application/json" -H "Content-Type: application/json" -d '{"number": 3}' -X GET http://localhost:9000/recommendation/statistic/first
What's wrong??

Answer 1

GET shouldn't have body. look at HTTP GET with request body.
POST method is not only for modify the server state, but also to process data.
From RFC 2616 - HTTP/1.1:
The POST method is used to request that the origin server accept the
entity enclosed in the request as a new subordinate of the resource
identified by the Request-URI in the Request-Line. POST is designed
to allow a uniform method to cover the following functions:
Annotation of existing resources;
Posting a message to a bulletin board, newsgroup, mailing list,
or similar group of articles;
Providing a block of data, such as the result of submitting a
form, to a data-handling process;
Extending a database through an append operation.
The actual function performed by the POST method is determined by the
server and is usually dependent on the Request-URI. [...]