Added request and response

Response.go

@@ -0,0 +1,24 @@
+package server
+
+import "net/http"
+
+// Response is the interface for an HTTP response.
+type Response interface {
+	Header(key string) string
+	SetHeader(key string, value string)
+}
+
+// response represents the HTTP response used in the given context.
+type response struct {
+	http.ResponseWriter
+}
+
+// Header returns the header value for the given key.
+func (res response) Header(key string) string {
+	return res.ResponseWriter.Header().Get(key)
+}
+
+// SetHeader sets the header value for the given key.
+func (res response) SetHeader(key string, value string) {
+	res.ResponseWriter.Header().Set(key, value)
+}