Default to json content-type in api

api/handler/rpc/rpc.go

@@ -120,61 +120,63 @@ func (h *rpcHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	var rsp []byte
 
 	switch {
-	// json codecs
-	case hasCodec(ct, jsonCodecs):
-		var request json.RawMessage
+	// proto codecs
+	case hasCodec(ct, protoCodecs):
+		request := &proto.Message{}
 		// if the extracted payload isn't empty lets use it
 		if len(br) > 0 {
-			request = json.RawMessage(br)
+			request = proto.NewMessage(br)
 		}
 
 		// create request/response
-		var response json.RawMessage
+		response := &proto.Message{}
 
 		req := c.NewRequest(
 			service.Name,
 			service.Endpoint.Name,
-			&request,
+			request,
 			client.WithContentType(ct),
 		)
 
 		// make the call
-		if err := c.Call(cx, req, &response, client.WithSelectOption(so)); err != nil {
+		if err := c.Call(cx, req, response, client.WithSelectOption(so)); err != nil {
 			writeError(w, r, err)
 			return
 		}
 
 		// marshall response
-		rsp, _ = response.MarshalJSON()
-	// proto codecs
-	case hasCodec(ct, protoCodecs):
-		request := &proto.Message{}
+		rsp, _ = response.Marshal()
+	default:
+		// if json codec is not present set to json
+		if !hasCodec(ct, jsonCodecs) {
+			ct = "application/json"
+		}
+
+		// default to trying json
+		var request json.RawMessage
 		// if the extracted payload isn't empty lets use it
 		if len(br) > 0 {
-			request = proto.NewMessage(br)
+			request = json.RawMessage(br)
 		}
 
 		// create request/response
-		response := &proto.Message{}
+		var response json.RawMessage
 
 		req := c.NewRequest(
 			service.Name,
 			service.Endpoint.Name,
-			request,
+			&request,
 			client.WithContentType(ct),
 		)
 
 		// make the call
-		if err := c.Call(cx, req, response, client.WithSelectOption(so)); err != nil {
+		if err := c.Call(cx, req, &response, client.WithSelectOption(so)); err != nil {
 			writeError(w, r, err)
 			return
 		}
 
 		// marshall response
-		rsp, _ = response.Marshal()
-	default:
-		http.Error(w, "Unsupported Content-Type", 400)
-		return
+		rsp, _ = response.MarshalJSON()
 	}
 
 	// write the response