Added Server interface

Context.go

@@ -24,16 +24,18 @@ type Context interface {
 	Reader(io.Reader) error
 	RequestHeader(key string) string
 	ResponseHeader(key string) string
+	Scheme() string
 	Status(status int) Context
 	String(string) error
 	Write([]byte) (int, error)
+	WriteString(string) (int, error)
 }
 
 // ctx represents a request & response context.
 type ctx struct {
 	request      *http.Request
 	response     http.ResponseWriter
-	server       *Server
+	server       *server
 	paramNames   [maxParams]string
 	paramValues  [maxParams]string
 	paramCount   int
@@ -64,7 +66,7 @@ func (ctx *ctx) Error(messages ...any) error {
 
 // Get retrieves a parameter.
 func (ctx *ctx) Get(param string) string {
-	for i := 0; i < ctx.paramCount; i++ {
+	for i := range ctx.paramCount {
 		if ctx.paramNames[i] == param {
 			return ctx.paramValues[i]
 		}
@@ -120,6 +122,11 @@ func (ctx *ctx) Reader(reader io.Reader) error {
 	return err
 }
 
+// Scheme returns either `http` or `https`.
+func (ctx *ctx) Scheme() string {
+	return ctx.request.URL.Scheme
+}
+
 // Status sets the HTTP status of the response.
 func (ctx *ctx) Status(status int) Context {
 	ctx.response.WriteHeader(status)
@@ -137,6 +144,11 @@ func (ctx *ctx) Write(body []byte) (int, error) {
 	return ctx.response.Write(body)
 }
 
+// WriteString implements the io.StringWriter interface.
+func (ctx *ctx) WriteString(body string) (int, error) {
+	return ctx.response.(io.StringWriter).WriteString(body)
+}
+
 // addParameter adds a new parameter to the context.
 func (ctx *ctx) addParameter(name string, value string) {
 	ctx.paramNames[ctx.paramCount] = name