diff --git a/internal/config/types.go b/internal/config/types.go
index 7cf7bdd..8646585 100644
--- a/internal/config/types.go
+++ b/internal/config/types.go
@@ -23,5 +23,5 @@ type Controller struct {
 	PUT    *Method `json:"PUT"`
 	DELETE *Method `json:"DELETE"`
 
-	Children map[string]Controller `json:"/"`
+	Children map[string]*Controller `json:"/"`
 }
diff --git a/request_builder.go b/request_builder.go
index bfc251a..fc5f163 100644
--- a/request_builder.go
+++ b/request_builder.go
@@ -2,12 +2,15 @@ package gfw
 
 import (
 	"encoding/json"
+	"fmt"
 	"log"
-	"math"
 	"net/http"
 	"strings"
+	"time"
 )
 
+// buildRequest builds an interface request
+// from a http.Request
 func buildRequest(req *http.Request) (*Request, error) {
 
 	/* (1) Init request */
@@ -16,7 +19,9 @@ func buildRequest(req *http.Request) (*Request, error) {
 		Uri:      strings.Split(uri, "/"),
 		GetData:  FetchGetData(req),
 		FormData: FetchFormData(req),
+		Data:     make(map[string]interface{}),
 	}
+	inst.ControllerUri = make([]string, 0, len(inst.Uri))
 
 	return inst, nil
 }
@@ -91,8 +96,9 @@ func FetchFormData(req *http.Request) map[string]interface{} {
 
 	} else { // form-data or anything
 
+		startn := time.Now().UnixNano()
 		// 1. Parse form-data
-		if err := req.ParseMultipartForm(math.MaxInt32); err != nil {
+		if err := req.ParseMultipartForm(req.ContentLength + 1); err != nil {
 			log.Printf("[read.multipart] %s\n", err)
 			return res
 		}
@@ -101,6 +107,7 @@ func FetchFormData(req *http.Request) map[string]interface{} {
 		for name, value := range req.PostForm {
 			res[name] = value
 		}
+		fmt.Printf("* %.3f us\n", float64(time.Now().UnixNano()-startn)/1e3)
 
 	}
 
diff --git a/router.go b/router.go
index 653245c..1607217 100644
--- a/router.go
+++ b/router.go
@@ -2,11 +2,12 @@ package gfw
 
 import (
 	"fmt"
+	"git.xdrm.io/gfw/internal/config"
 	"log"
 	"net/http"
 )
 
-func route(res http.ResponseWriter, req *http.Request) {
+func (s Server) route(res http.ResponseWriter, req *http.Request) {
 
 	/* (1) Build request
 	---------------------------------------------------------*/
@@ -16,17 +17,73 @@ func route(res http.ResponseWriter, req *http.Request) {
 		log.Fatal(req)
 	}
 
-	fmt.Printf("Uri:    %v\n", request.Uri)
-	fmt.Printf("GET:    %v\n", request.GetData)
-	fmt.Printf("POST:   %v\n", request.FormData)
+	// fmt.Printf("Uri:    %v\n", request.Uri)
+	// fmt.Printf("GET:    %v\n", request.GetData)
+	// fmt.Printf("POST:   %v\n", request.FormData)
 
-	// 1. Query parameters
-	// fmt.Printf("query: %v\n", req.URL.Query())
+	/* (2) Find a controller
+	---------------------------------------------------------*/
+	/* (1) Init browsing cursors */
+	ctl := s.config
+	uriIndex := 0
 
-	// 2. URI path
-	// fmt.Printf("uri: %v\n", req.URL.Path)
+	/* (2) Browse while there is uri parts */
+	for uriIndex < len(request.Uri) {
+		uri := request.Uri[uriIndex]
 
-	// 3. Form values
-	// fmt.Printf("form: %v\n", req.FormValue("asa"))
+		child, hasKey := ctl.Children[uri]
 
+		// stop if no matchind child
+		if !hasKey {
+			break
+		}
+
+		request.ControllerUri = append(request.ControllerUri, uri)
+		ctl = child
+		uriIndex++
+
+	}
+
+	/* (3) Check method
+	---------------------------------------------------------*/
+	/* (1) Unavailable method */
+	if req.Method == "GET" && ctl.GET == nil ||
+		req.Method == "POST" && ctl.POST == nil ||
+		req.Method == "PUT" && ctl.PUT == nil ||
+		req.Method == "DELETE" && ctl.DELETE == nil {
+
+		Json, _ := ErrUnknownMethod.MarshalJSON()
+		res.Header().Add("Content-Type", "application/json")
+		res.Write(Json)
+		log.Printf("[err] %s\n", ErrUnknownMethod.Reason)
+		return
+
+	}
+
+	/* (2) Extract method cursor */
+	var method *config.Method
+
+	if req.Method == "GET" {
+		method = ctl.GET
+	} else if req.Method == "POST" {
+		method = ctl.POST
+	} else if req.Method == "PUT" {
+		method = ctl.PUT
+	} else if req.Method == "DELETE" {
+		method = ctl.DELETE
+	}
+
+	/* (3) Unmanaged HTTP method */
+	if method == nil { // unknown method
+		Json, _ := ErrUnknownMethod.MarshalJSON()
+		res.Header().Add("Content-Type", "application/json")
+		res.Write(Json)
+		log.Printf("[err] %s\n", ErrUnknownMethod.Reason)
+		return
+	}
+
+	/* (4) Check arguments
+	---------------------------------------------------------*/
+	fmt.Printf("OK\n")
+	return
 }
diff --git a/server.go b/server.go
index 8c11819..7949ca5 100644
--- a/server.go
+++ b/server.go
@@ -9,7 +9,7 @@ import (
 func (s *Server) Launch(port uint16) error {
 
 	/* (1) Bind router */
-	http.HandleFunc("/", route)
+	http.HandleFunc("/", s.route)
 
 	/* (2) Bind listener */
 	return http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
diff --git a/types.go b/types.go
index 183722a..2256488 100644
--- a/types.go
+++ b/types.go
@@ -11,7 +11,9 @@ type Server struct {
 }
 
 type Request struct {
-	Uri      []string
-	FormData map[string]interface{}
-	GetData  map[string]interface{}
+	Uri           []string
+	ControllerUri []string
+	FormData      map[string]interface{}
+	GetData       map[string]interface{}
+	Data          map[string]interface{}
 }