Settings HTTP output header parameters working with aggregation

Question

I am trying to change the contentType from the response of an aggregated operation, here is my example code.

interface MyAggregateInterface {
 RequestResponse:
 op1(typeOp1Request)(typeOp1Response)
}    
outputPort MyAggregatePort {
      Interfaces: MyAggregateInterface
    }

embedded {
      Jolie:
         "MyAggratedCode.ol" in MyAggregatePort
  }

 inputPort MyInputPortHttp {
    Protocol: http {
            .debug= 1;
            .debug.showContent =1;
            .format -> format;
            .contentType -> mime;
             .charset ="UTF-8";
            .default = "default";
            .compression = false
        }
        Location: "socket://localhost:8081"
        Interfaces: DefaultHttpInterface 
        Aggregates: MyAggregatePort
        }

I would like to change the return format for op1.

Answer 1

well I will try to answer your question

we need to define your op1 response type

type typeOp1Response:any{
  .format?:string
}

or if you prefer

type typeOp1Response:undefined

I personally prefer the first one so that you can decide the mime in the aggregated service

Now you need to add a courier sessions

courier MyInputPortHttp {
   [interface MyAggregateInterface( request )( response )]{

   forward( request )( response );
    if (is_defined(response.format)){
         mime = response.format;
         undef(response.format);
      }
    } 

This implementation has a limitation that can return flat data in the root node Another way is to use the inputType to define your output format.

type typeOp1Request:void{
  .otherParameter1:string
  .format?:string
}

then your courier

courier MyInputPortHttp { [interface MyAggregateInterface( request )( response )]{

   forward( request )( response );
    if (request.format=="json"){
         mime = "application/json"
      };
    if (request.format=="xml"){
         mime = "application/xml"
      };

    } 

Not sure if this answers your question