diff --git a/err/defaults.go b/err/defaults.go
new file mode 100644
index 0000000..9ce8dc6
--- /dev/null
+++ b/err/defaults.go
@@ -0,0 +1,34 @@
+package err
+
+var (
+	/* Base */
+	Success = Error{0, "all right", nil}
+	Failure = Error{1, "it failed", nil}
+	Unknown = Error{-1, "", nil}
+
+	NoMatchFound  = Error{2, "no resource found", nil}
+	AlreadyExists = Error{3, "resource already exists", nil}
+
+	Config = Error{4, "configuration error", nil}
+
+	/* I/O */
+	Upload                 = Error{100, "upload failed", nil}
+	Download               = Error{101, "download failed", nil}
+	MissingDownloadHeaders = Error{102, "download headers are missing", nil}
+	MissingDownloadBody    = Error{103, "download body is missing", nil}
+
+	/* Controllers */
+	UnknownController    = Error{200, "unknown controller", nil}
+	UnknownMethod        = Error{201, "unknown method", nil}
+	UncallableController = Error{202, "uncallable controller", nil}
+	UncallableMethod     = Error{203, "uncallable method", nil}
+
+	/* Permissions */
+	Permission = Error{300, "permission error", nil}
+	Token      = Error{301, "token error", nil}
+
+	/* Check */
+	MissingParam        = Error{400, "missing parameter", nil}
+	InvalidParam        = Error{401, "invalid parameter", nil}
+	InvalidDefaultParam = Error{402, "invalid default param", nil}
+)
diff --git a/err/interface.go b/err/interface.go
new file mode 100644
index 0000000..6c4dfef
--- /dev/null
+++ b/err/interface.go
@@ -0,0 +1,52 @@
+package err
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type Error struct {
+	Code      int
+	Reason    string
+	Arguments []interface{}
+}
+
+// BindArgument adds an argument to the error
+// to be displayed back to API caller
+func (e *Error) BindArgument(arg interface{}) {
+
+	/* (1) Make slice if not */
+	if e.Arguments == nil {
+		e.Arguments = make([]interface{}, 0)
+	}
+
+	/* (2) Append argument */
+	e.Arguments = append(e.Arguments, arg)
+
+}
+
+// Implements 'error'
+func (e Error) Error() string {
+
+	return fmt.Sprintf("[%d] %s", e.Code, e.Reason)
+
+}
+
+// Implements json.Marshaler
+func (e Error) MarshalJSON() ([]byte, error) {
+
+	var json_arguments string
+
+	/* (1) Marshal 'Arguments' if set */
+	if e.Arguments != nil && len(e.Arguments) > 0 {
+		arg_representation, err := json.Marshal(e.Arguments)
+		if err == nil {
+			json_arguments = fmt.Sprintf(",\"arguments\":%s", arg_representation)
+		}
+
+	}
+
+	/* (2) Render JSON manually */
+	return []byte(fmt.Sprintf("{\"error\":%d,\"reason\":\"%s\"%s}", e.Code, e.Reason, json_arguments)), nil
+
+}
diff --git a/errors.go b/errors.go
deleted file mode 100644
index 34a4e06..0000000
--- a/errors.go
+++ /dev/null
@@ -1,85 +0,0 @@
-package gfw
-
-import (
-	"encoding/json"
-	"fmt"
-)
-
-type Err struct {
-	Code      int
-	Reason    string
-	Arguments []interface{}
-}
-
-var (
-	/* Base */
-	ErrSuccess = Err{0, "all right", nil}
-	ErrFailure = Err{1, "it failed", nil}
-	ErrUnknown = Err{-1, "", nil}
-
-	ErrNoMatchFound  = Err{2, "no resource found", nil}
-	ErrAlreadyExists = Err{3, "resource already exists", nil}
-
-	ErrConfig = Err{4, "configuration error", nil}
-
-	/* I/O */
-	ErrUpload                 = Err{100, "upload failed", nil}
-	ErrDownload               = Err{101, "download failed", nil}
-	ErrMissingDownloadHeaders = Err{102, "download headers are missing", nil}
-	ErrMissingDownloadBody    = Err{103, "download body is missing", nil}
-
-	/* Controllers */
-	ErrUnknownController    = Err{200, "unknown controller", nil}
-	ErrUnknownMethod        = Err{201, "unknown method", nil}
-	ErrUncallableController = Err{202, "uncallable controller", nil}
-	ErrUncallableMethod     = Err{203, "uncallable method", nil}
-
-	/* Permissions */
-	ErrPermission = Err{300, "permission error", nil}
-	ErrToken      = Err{301, "token error", nil}
-
-	/* Check */
-	ErrMissingParam        = Err{400, "missing parameter", nil}
-	ErrInvalidParam        = Err{401, "invalid parameter", nil}
-	ErrInvalidDefaultParam = Err{402, "invalid default param", nil}
-)
-
-// BindArgument adds an argument to the error
-// to be displayed back to API caller
-func (e *Err) BindArgument(arg interface{}) {
-
-	/* (1) Make slice if not */
-	if e.Arguments == nil {
-		e.Arguments = make([]interface{}, 0)
-	}
-
-	/* (2) Append argument */
-	e.Arguments = append(e.Arguments, arg)
-
-}
-
-// Implements 'error'
-func (e Err) Error() string {
-
-	return fmt.Sprintf("[%d] %s", e.Code, e.Reason)
-
-}
-
-// Implements json.Marshaler
-func (e Err) MarshalJSON() ([]byte, error) {
-
-	var json_arguments string
-
-	/* (1) Marshal 'Arguments' if set */
-	if e.Arguments != nil && len(e.Arguments) > 0 {
-		arg_representation, err := json.Marshal(e.Arguments)
-		if err == nil {
-			json_arguments = fmt.Sprintf(",\"arguments\":%s", arg_representation)
-		}
-
-	}
-
-	/* (2) Render JSON manually */
-	return []byte(fmt.Sprintf("{\"error\":%d,\"reason\":\"%s\"%s}", e.Code, e.Reason, json_arguments)), nil
-
-}
diff --git a/loader.go b/loader.go
index e674100..ada36ae 100644
--- a/loader.go
+++ b/loader.go
@@ -3,6 +3,7 @@ package gfw
 import (
 	"git.xdrm.io/xdrm-brackets/gfw/checker"
 	"git.xdrm.io/xdrm-brackets/gfw/config"
+	"git.xdrm.io/xdrm-brackets/gfw/err"
 )
 
 // Init initilises a new framework instance
@@ -18,7 +19,7 @@ func Init(path string, typeChecker *checker.TypeRegistry) (*Server, error) {
 	inst := &Server{
 		config: nil,
 		Params: make(map[string]interface{}),
-		err:    ErrSuccess,
+		err:    err.Success,
 	}
 
 	/* (2) Load configuration */
diff --git a/request_builder.go b/request_builder.go
index 1ec6a9b..bff6b5d 100644
--- a/request_builder.go
+++ b/request_builder.go
@@ -3,8 +3,10 @@ package gfw
 import (
 	"encoding/json"
 	"fmt"
+	"git.xdrm.io/xdrm-brackets/gfw/err"
 	"log"
 	"net/http"
+	"plugin"
 	"reflect"
 	"strings"
 	"time"
@@ -189,3 +191,40 @@ func parseHttpData(data interface{}) interface{} {
 	return dvalue
 
 }
+
+// loadController tries to load a controller from its uri
+// checks for its given method ('Get', 'Post', 'Put', or 'Delete')
+func (i *Request) loadController(method string) (func(map[string]interface{}) (map[string]interface{}, err.Error), error) {
+
+	/* (1) Build controller path */
+	path := fmt.Sprintf("%si.so", i.ControllerUri)
+
+	/* (2) Format url */
+	tmp := []byte(strings.ToLower(method))
+	tmp[0] = tmp[0] - ('a' - 'A')
+	method = string(tmp)
+
+	fmt.Printf("method is '%s'\n", method)
+	return nil, nil
+
+	/* (2) Try to load plugin */
+	p, err2 := plugin.Open(path)
+	if err2 != nil {
+		return nil, err2
+	}
+
+	/* (3) Try to extract method */
+	m, err2 := p.Lookup(method)
+	if err2 != nil {
+		return nil, err2
+	}
+
+	/* (4) Check signature */
+	callable, validSignature := m.(func(map[string]interface{}) (map[string]interface{}, err.Error))
+	if !validSignature {
+		return nil, fmt.Errorf("Invalid signature for method %s", method)
+	}
+
+	return callable, nil
+
+}
diff --git a/request_data.go b/request_data.go
index 60ab0be..67ca941 100644
--- a/request_data.go
+++ b/request_data.go
@@ -9,15 +9,15 @@ import (
 	"strings"
 )
 
-// buildRequestDataFromRequest builds a 'RequestData'
+// buildRequestDataFromRequest builds a 'requestData'
 // from an http request
-func buildRequestDataFromRequest(req *http.Request) *RequestData {
+func buildRequestDataFromRequest(req *http.Request) *requestData {
 
-	i := &RequestData{
-		Url:  make([]*RequestParameter, 0),
-		Get:  make(map[string]*RequestParameter),
-		Form: make(map[string]*RequestParameter),
-		Set:  make(map[string]*RequestParameter),
+	i := &requestData{
+		Url:  make([]*requestParameter, 0),
+		Get:  make(map[string]*requestParameter),
+		Form: make(map[string]*requestParameter),
+		Set:  make(map[string]*requestParameter),
 	}
 
 	// GET (query) data
@@ -37,7 +37,7 @@ func buildRequestDataFromRequest(req *http.Request) *RequestData {
 
 // bindUrl stores URL data and fills 'Set'
 // with creating pointers inside 'Url'
-func (i *RequestData) fillUrl(data []string) {
+func (i *requestData) fillUrl(data []string) {
 
 	for index, value := range data {
 
@@ -45,7 +45,7 @@ func (i *RequestData) fillUrl(data []string) {
 		setindex := fmt.Sprintf("URL#%d", index)
 
 		// store value in 'Set'
-		i.Set[setindex] = &RequestParameter{
+		i.Set[setindex] = &requestParameter{
 			Parsed: false,
 			Value:  value,
 		}
@@ -58,7 +58,7 @@ func (i *RequestData) fillUrl(data []string) {
 }
 
 // fetchGet stores data from the QUERY (in url parameters)
-func (i *RequestData) fetchGet(req *http.Request) {
+func (i *requestData) fetchGet(req *http.Request) {
 
 	for name, value := range req.URL.Query() {
 
@@ -72,7 +72,7 @@ func (i *RequestData) fetchGet(req *http.Request) {
 		setindex := fmt.Sprintf("GET@%s", name)
 
 		// store value in 'Set'
-		i.Set[setindex] = &RequestParameter{
+		i.Set[setindex] = &requestParameter{
 			Parsed: false,
 			Value:  value,
 		}
@@ -89,7 +89,7 @@ func (i *RequestData) fetchGet(req *http.Request) {
 // - parse 'form-data' if not supported (not POST requests)
 // - parse 'x-www-form-urlencoded'
 // - parse 'application/json'
-func (i *RequestData) fetchForm(req *http.Request) {
+func (i *requestData) fetchForm(req *http.Request) {
 
 	contentType := req.Header.Get("Content-Type")
 
@@ -116,7 +116,7 @@ func (i *RequestData) fetchForm(req *http.Request) {
 
 // parseJsonForm parses JSON from the request body inside 'Form'
 // and 'Set'
-func (i *RequestData) parseJsonForm(req *http.Request) {
+func (i *requestData) parseJsonForm(req *http.Request) {
 
 	parsed := make(map[string]interface{}, 0)
 
@@ -137,7 +137,7 @@ func (i *RequestData) parseJsonForm(req *http.Request) {
 		}
 
 		// store value in 'Set'
-		i.Set[name] = &RequestParameter{
+		i.Set[name] = &requestParameter{
 			Parsed: true,
 			Value:  value,
 		}
@@ -151,7 +151,7 @@ func (i *RequestData) parseJsonForm(req *http.Request) {
 
 // parseUrlencodedForm parses urlencoded from the request body inside 'Form'
 // and 'Set'
-func (i *RequestData) parseUrlencodedForm(req *http.Request) {
+func (i *requestData) parseUrlencodedForm(req *http.Request) {
 
 	// use http.Request interface
 	req.ParseForm()
@@ -165,7 +165,7 @@ func (i *RequestData) parseUrlencodedForm(req *http.Request) {
 		}
 
 		// store value in 'Set'
-		i.Set[name] = &RequestParameter{
+		i.Set[name] = &requestParameter{
 			Parsed: false,
 			Value:  value,
 		}
@@ -178,7 +178,7 @@ func (i *RequestData) parseUrlencodedForm(req *http.Request) {
 
 // parseMultipartForm parses multi-part from the request body inside 'Form'
 // and 'Set'
-func (i *RequestData) parseMultipartForm(req *http.Request) {
+func (i *requestData) parseMultipartForm(req *http.Request) {
 
 	/* (1) Create reader */
 	mpr := multipart.CreateReader(req)
@@ -196,7 +196,7 @@ func (i *RequestData) parseMultipartForm(req *http.Request) {
 		}
 
 		// store value in 'Set'
-		i.Set[name] = &RequestParameter{
+		i.Set[name] = &requestParameter{
 			Parsed: false,
 			File:   component.File,
 			Value:  component.Data,
diff --git a/router.go b/router.go
index 7560171..3e03769 100644
--- a/router.go
+++ b/router.go
@@ -3,6 +3,7 @@ package gfw
 import (
 	"fmt"
 	"git.xdrm.io/xdrm-brackets/gfw/config"
+	"git.xdrm.io/xdrm-brackets/gfw/err"
 	"log"
 	"net/http"
 	"strings"
@@ -13,65 +14,30 @@ func (s *Server) route(res http.ResponseWriter, req *http.Request) {
 	/* (1) Build request
 	---------------------------------------------------------*/
 	/* (1) Try to build request */
-	request, err := buildRequest(req)
-	if err != nil {
+	request, err2 := buildRequest(req)
+	if err2 != nil {
 		log.Fatal(req)
 	}
 
 	/* (2) Find a controller
 	---------------------------------------------------------*/
-	/* (1) Init browsing cursors */
-	ctl := s.config
-	uriIndex := 0
-
-	/* (2) Browse while there is uri parts */
-	for uriIndex < len(request.Uri) {
-		uri := request.Uri[uriIndex]
-
-		child, hasKey := ctl.Children[uri]
-
-		// stop if no matchind child
-		if !hasKey {
-			break
-		}
-
-		request.ControllerUri = append(request.ControllerUri, uri)
-		ctl = child
-		uriIndex++
-
-	}
-
-	/* (3) Extract & store URI params */
-	request.Data.fillUrl(request.Uri[uriIndex:])
+	controller := s.findController(request)
 
 	/* (3) Check method
 	---------------------------------------------------------*/
-	/* (1) Unavailable method */
-	if !config.IsMethodAvailable(req.Method) {
+	method := s.getMethod(controller, req.Method)
 
-		Json, _ := ErrUnknownMethod.MarshalJSON()
+	if method == nil {
+		Json, _ := err.UnknownMethod.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 = ctl.Method(req.Method)
-
-	/* (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)
+		log.Printf("[err] %s\n", err.UnknownMethod.Reason)
 		return
 	}
 
 	/* (4) Check parameters
 	---------------------------------------------------------*/
-	var paramError Err = ErrSuccess
+	var paramError err.Error = err.Success
 	parameters := make(map[string]interface{})
 	for name, param := range method.Parameters {
 
@@ -80,14 +46,14 @@ func (s *Server) route(res http.ResponseWriter, req *http.Request) {
 
 		/* (2) Required & missing */
 		if !isset && !*param.Optional {
-			paramError = ErrMissingParam
+			paramError = err.MissingParam
 			paramError.BindArgument(name)
 			break
 		}
 
 		/* (3) Optional & missing: set default value */
 		if !isset {
-			p = &RequestParameter{
+			p = &requestParameter{
 				Parsed: true,
 				File:   param.Type == "FILE",
 				Value:  nil,
@@ -105,7 +71,7 @@ func (s *Server) route(res http.ResponseWriter, req *http.Request) {
 		/* (4) Fail on unexpected multipart file */
 		waitFile, gotFile := param.Type == "FILE", p.File
 		if gotFile && !waitFile || !gotFile && waitFile {
-			paramError = ErrInvalidParam
+			paramError = err.InvalidParam
 			paramError.BindArgument(name)
 			paramError.BindArgument("FILE")
 			break
@@ -120,7 +86,7 @@ func (s *Server) route(res http.ResponseWriter, req *http.Request) {
 		/* (6) Check type */
 		if s.Checker.Run(param.Type, p.Value) != nil {
 
-			paramError = ErrInvalidParam
+			paramError = err.InvalidParam
 			paramError.BindArgument(name)
 			paramError.BindArgument(param.Type)
 			paramError.BindArgument(p.Value)
@@ -131,10 +97,9 @@ func (s *Server) route(res http.ResponseWriter, req *http.Request) {
 		parameters[name] = p.Value
 
 	}
-	fmt.Printf("\n")
 
 	// Fail if argument check failed
-	if paramError.Code != ErrSuccess.Code {
+	if paramError.Code != err.Success.Code {
 		Json, _ := paramError.MarshalJSON()
 		res.Header().Add("Content-Type", "application/json")
 		res.Write(Json)
@@ -142,9 +107,69 @@ func (s *Server) route(res http.ResponseWriter, req *http.Request) {
 		return
 	}
 
+	/* (5) Load controller
+	---------------------------------------------------------*/
+	callable, err := request.loadController(req.Method)
+	if err != nil {
+		log.Printf("[err] %s\n", err)
+		return
+	}
 	fmt.Printf("OK\nplugin: '%si.so'\n", strings.Join(request.ControllerUri, "/"))
 	for name, value := range parameters {
 		fmt.Printf("  $%s = %v\n", name, value)
 	}
+
+	/* (6) Execute and get response
+	---------------------------------------------------------*/
+	out, _ := callable(parameters)
+	fmt.Printf("-- OUT --\n")
+	for name, value := range out {
+		fmt.Printf("  $%s = %v\n", name, value)
+	}
 	return
 }
+
+func (s *Server) findController(req *Request) *config.Controller {
+	/* (1) Init browsing cursors */
+	ctl := s.config
+	uriIndex := 0
+
+	/* (2) Browse while there is uri parts */
+	for uriIndex < len(req.Uri) {
+		uri := req.Uri[uriIndex]
+
+		child, hasKey := ctl.Children[uri]
+
+		// stop if no matchind child
+		if !hasKey {
+			break
+		}
+
+		req.ControllerUri = append(req.ControllerUri, uri)
+		ctl = child
+		uriIndex++
+
+	}
+
+	/* (3) Extract & store URI params */
+	req.Data.fillUrl(req.Uri[uriIndex:])
+
+	/* (4) Return controller */
+	return ctl
+
+}
+
+func (s *Server) getMethod(controller *config.Controller, method string) *config.Method {
+
+	/* (1) Unavailable method */
+	if !config.IsMethodAvailable(method) {
+		return nil
+	}
+
+	/* (2) Extract method cursor */
+	var foundMethod = controller.Method(method)
+
+	/* (3) Return method | nil on error */
+	return foundMethod
+
+}
diff --git a/types.go b/types.go
index 3bcc677..a48aaf2 100644
--- a/types.go
+++ b/types.go
@@ -3,13 +3,14 @@ package gfw
 import (
 	"git.xdrm.io/xdrm-brackets/gfw/checker"
 	"git.xdrm.io/xdrm-brackets/gfw/config"
+	"git.xdrm.io/xdrm-brackets/gfw/err"
 )
 
 type Server struct {
 	config  *config.Controller
 	Params  map[string]interface{}
 	Checker *checker.TypeRegistry // type check
-	err     Err
+	err     err.Error
 }
 
 type Request struct {
@@ -21,21 +22,21 @@ type Request struct {
 	ControllerUri []string
 
 	// contains all data from URL, GET, and FORM
-	Data *RequestData
+	Data *requestData
 }
 
-type RequestData struct {
+type requestData struct {
 
 	// ordered values from the URI
 	//  catches all after the controller path
 	//
 	// points to Request.Data
-	Url []*RequestParameter
+	Url []*requestParameter
 
 	// uri parameters following the QUERY format
 	//
 	// points to Request.Data
-	Get map[string]*RequestParameter
+	Get map[string]*requestParameter
 
 	// form data depending on the Content-Type:
 	//  'application/json'                  => key-value pair is parsed as json into the map
@@ -43,18 +44,18 @@ type RequestData struct {
 	//  'multipart/form-data'               => parse form-data format
 	//
 	// points to Request.Data
-	Form map[string]*RequestParameter
+	Form map[string]*requestParameter
 
 	// contains URL+GET+FORM data with prefixes:
 	// - FORM: no prefix
 	// - URL:  'URL#' followed by the index in Uri
 	// - GET:  'GET@' followed by the key in GET
-	Set map[string]*RequestParameter
+	Set map[string]*requestParameter
 }
 
-// RequestParameter represents an http request parameter
+// requestParameter represents an http request parameter
 // that can be of type URL, GET, or FORM (multipart, json, urlencoded)
-type RequestParameter struct {
+type requestParameter struct {
 	// whether the value has been json-parsed
 	// for optimisation purpose, parameters are only parsed
 	// if they are required by the current controller