diff --git a/cmd/gwstester/tester.go b/cmd/gwstester/tester.go
index 49aa1dc..3f30860 100644
--- a/cmd/gwstester/tester.go
+++ b/cmd/gwstester/tester.go
@@ -43,13 +43,23 @@ func manageClient(sock net.Conn) {
 
 	for {
 
-		req, err := request.Build(sock)
+		/* (1) Parse request */
+		req, errRq := request.Parse(sock)
+		if errRq != nil { fmt.Printf("Request parsing error: %s\n", errRq) }
+		fmt.Printf("%v\n", req)
+
+		/* (2) Build response */
+		res := req.BuildResponse()
+
+		/* (3) Write into socket */
+		written, err := res.Send(sock)
 		if err != nil {
-			fmt.Printf("STATUS CODE: %d %s\n", req.StatusCode(), req.StatusCode().Explicit())
-			panic(err)
+			fmt.Printf("WRITE ERROR: %s\n", err);
+			return
 		}
 
-		fmt.Printf("%v\n", req)
+		fmt.Printf("Written %d bytes\n", written)
+
 		break;
 
 	}
diff --git a/http/upgrade/request/public.go b/http/upgrade/request/public.go
index 973f956..89a8654 100644
--- a/http/upgrade/request/public.go
+++ b/http/upgrade/request/public.go
@@ -9,7 +9,7 @@ import (
 
 // Parse builds an upgrade HTTP request
 // from a reader (typically bufio.NewRead of the socket)
-func Build(r io.Reader) (request *T, err error) {
+func Parse(r io.Reader) (request *T, err error) {
 
 	req := new(T)
 	req.code = 500
@@ -75,3 +75,24 @@ func (r T) String() string{
 func (r T) StatusCode() response.StatusCode {
 	return r.code
 }
+
+
+
+// BuildResponse builds a response.T from the request
+func (r *T) BuildResponse() *response.T{
+
+	inst := new(response.T)
+
+	/* (1) Copy code */
+	inst.SetStatusCode(r.code)
+
+	/* (2) Set Protocol */
+	if len(r.protocols) > 0 {
+		inst.SetProtocol(r.protocols[0])
+	}
+
+	/* (4) Process key */
+	inst.ProcessKey(r.key)
+
+	return inst
+}
\ No newline at end of file
diff --git a/http/upgrade/response/public.go b/http/upgrade/response/public.go
new file mode 100644
index 0000000..e64518d
--- /dev/null
+++ b/http/upgrade/response/public.go
@@ -0,0 +1,62 @@
+package response
+
+import (
+	"fmt"
+	"io"
+	"encoding/base64"
+	"crypto/sha1"
+)
+
+
+
+// SetStatusCode sets the status code
+func (r *T) SetStatusCode(sc StatusCode) {
+	r.code = sc
+}
+
+// SetProtocols sets the protocols
+func (r *T) SetProtocol(p []byte) {
+	r.protocol = p
+}
+
+// ProcessKey processes the accept token according
+// to the rfc from the Sec-WebSocket-Key
+func (r *T) ProcessKey(k []byte) {
+
+	/* (1) Concat with constant salt */
+	mix := append(k, WSSalt...)
+
+	/* (2) Hash with sha1 algorithm */
+	digest := sha1.Sum(mix)
+
+	/* (3) Base64 encode it */
+	r.accept = []byte( base64.StdEncoding.EncodeToString( digest[:sha1.Size] ) )
+
+}
+
+
+// Send sends the response through an io.Writer
+// typically a socket
+func (r T) Send(w io.Writer) (int, error) {
+
+	/* (1) Build response line */
+	responseLine := fmt.Sprintf("HTTP/%s %d %s\r\n", HttpVersion, r.code, r.code.Explicit())
+
+	/* (2) Build headers */
+	optionalProtocol := ""
+	if len(r.protocol) > 0 {
+		optionalProtocol = fmt.Sprintf("Sec-WebSocket-Protocol: %s\r\n", r.protocol)
+	}
+
+	headers := fmt.Sprintf("Upgrade: websocket\t\nConnection: Upgrade\r\nSec-WebSocket-Accept: %s\r\nSec-WebSocket-Version: %d\r\n%s", r.accept, WSVersion, optionalProtocol)
+
+	/* (3) Build all */
+	raw := []byte(fmt.Sprintf("%s%s\r\n", responseLine, headers))
+
+	/* (4) Write */
+	fmt.Printf("Upgrade Response\n----------------\n%s----------------\n", raw)
+	written, err := w.Write(raw)
+
+	return written, err
+
+}
\ No newline at end of file
diff --git a/http/upgrade/response/types.go b/http/upgrade/response/types.go
index 9349bb0..735b549 100644
--- a/http/upgrade/response/types.go
+++ b/http/upgrade/response/types.go
@@ -1,9 +1,15 @@
 package response
 
+// Constant
+const HttpVersion    = "1.1"
+const WSVersion      = 13
+var WSSalt    []byte = []byte("258EAFA5-E914-47DA-95CA-C5AB0DC85B11")
+
 // T represents an HTTP Upgrade Response
 type T struct {
 
-	code   StatusCode // status code
-	accept []byte     // processed from Sec-WebSocket-Key
-	protocol []byte   // set from Sec-WebSocket-Protocol or none if not received
+	code     StatusCode // status code
+	accept   []byte     // processed from Sec-WebSocket-Key
+	protocol []byte     // set from Sec-WebSocket-Protocol or none if not received
+
 }
\ No newline at end of file