diff --git a/cmd/test/main.go b/cmd/test/main.go
index 2357a15..160205d 100644
--- a/cmd/test/main.go
+++ b/cmd/test/main.go
@@ -30,7 +30,7 @@ Case(
 			c.Printf("Привет, Мир!")
 		}),
 	).Default(bond.Func(func(c *bond.Context){
-		c.SetContentType(contents.Plain)
+		c.SetContentType(contents.Plain, contents.Utf8)
 		c.Printf(
 			"AbsPath: %q\n" +
 			"Prefix: %q\n" +
diff --git a/contents/main.go b/contents/main.go
index 7c9e53c..57edb80 100644
--- a/contents/main.go
+++ b/contents/main.go
@@ -1,25 +1,29 @@
 package contents
 
-import (
-)
+type Option interface {
+	KeyValue() [2]string
+}
 
 type CharSet string
 const (
-	Utf8 = "utf-8"
+	Utf8 CharSet = "utf-8"
 )
+func (cs CharSet) KeyValue() [2]string {
+	return [2]string{
+		"charset",
+		string(cs),
+	}
+}
 
 type Type string
 const (
 	// Using the UTF-8 by default.
 	Unknown Type = "application/octet-stream"
 	Binary
-	Plain Type = "text/plain"
-	Css Type = "text/css"
-	Html Type = "text/html"
-	Json Type = "application/json"
-	UrlEncoded = "application/x-www-form-urlencoded"
+	Plain= "text/plain"
+	Css= "text/css"
+	Html= "text/html"
+	Json= "application/json"
+	UrlEncoded= "application/x-www-form-urlencoded"
 )
 
-func (t Type) CharSet(set CharSet) Type {
-	return t + ";" + Type(set)
-}
diff --git a/context.go b/context.go
index 6ca1fff..720625d 100644
--- a/context.go
+++ b/context.go
@@ -2,6 +2,7 @@ package bond
 
 import (
 	"io"
+	"strings"
 	"encoding/json"
 	"net/http"
 	"net/url"
@@ -31,12 +32,17 @@ func (c *Context) SetStatus(status Status) {
 }
 
 // Set the reply content type.
-func (c *Context) SetContentType(typ contents.Type) {
-	c.SetHeader("Content-Type", string(typ))
+func (c *Context) SetContentType(typ contents.Type, opts ...contents.Option) {
+	ret := string(typ)
+	for _, opt := range opts {
+		kv := opt.KeyValue()
+		ret += ";"+kv[0]+"="+kv[1]
+	}
+	c.SetHeader("Content-Type", ret)
 }
 
 // Get the request content type.
-func (c *Context) ContentType() ContentType {
+func (c *Context) ContentType() contents.Type {
 	ret, ok := c.Header("Content-Type")
 	if !ok {
 		return ""
@@ -44,7 +50,11 @@ func (c *Context) ContentType() ContentType {
 	if len(ret) < 1 {
 		return ""
 	}
-	return contents.Type(ret[0])
+	splits := strings.SplitN(ret[0], ";", 2)
+	if len(splits) < 0 {
+		return ""
+	}
+	return contents.Type(splits[0])
 }
 
 func (c *Context) SetHeader(k, v string) {
@@ -114,6 +124,18 @@ func (c *Context) NotFound() {
 	http.NotFound(c.W, c.R)
 }
 
+func (c *Context) InternalServerError(err error) {
+	c.W.WriteHeader(http.StatusInternalServerError)
+	if err != nil {
+		c.Printf("500 Internal Server Error: %q", err)
+	} else {
+	}
+}
+
+func (c *Context) Print(v ...any) (int, error) {
+	return fmt.Print(v...)
+}
+
 func (c *Context) Printf(format string, v ...any) (int, error) {
 	return fmt.Fprintf(c.W, format, v...)
 }
diff --git a/root.go b/root.go
index 204c146..fa3357c 100644
--- a/root.go
+++ b/root.go
@@ -27,3 +27,7 @@ func (router *RootRouter) ServeHTTP(w ResponseWriter, r *Request) {
 	ctx.RelUrl = &u
 	router.handler.Handle(&ctx)
 }
+
+func (router *RootRouter) Handle(c *Context) {
+	router.handler.Handle(c)
+}