支持文本消息的回复

context/context.go

@@ -17,12 +17,6 @@ func (ctx *Context) getAccessToken() {
 
 }
 
-func (ctx *Context) String(str string) error {
-	ctx.Writer.WriteHeader(200)
-	_, err := ctx.Writer.Write([]byte(str))
-	return err
-}
-
 // Query returns the keyed url query value if it exists
 func (ctx *Context) Query(key string) string {
 	value, _ := ctx.GetQuery(key)

context/render.go

@@ -0,0 +1,41 @@
+package context
+
+import (
+	"encoding/xml"
+	"net/http"
+)
+
+var xmlContentType = []string{"application/xml; charset=utf-8"}
+var plainContentType = []string{"text/plain; charset=utf-8"}
+
+//Render render from bytes
+func (ctx *Context) Render(bytes []byte) {
+	ctx.Writer.WriteHeader(200)
+	_, err := ctx.Writer.Write(bytes)
+	if err != nil {
+		panic(err)
+	}
+}
+
+//String render from string
+func (ctx *Context) String(str string) {
+	writeContextType(ctx.Writer, plainContentType)
+	ctx.Render([]byte(str))
+}
+
+//XML render to xml
+func (ctx *Context) XML(obj interface{}) {
+	writeContextType(ctx.Writer, xmlContentType)
+	bytes, err := xml.Marshal(obj)
+	if err != nil {
+		panic(err)
+	}
+	ctx.Render(bytes)
+}
+
+func writeContextType(w http.ResponseWriter, value []string) {
+	header := w.Header()
+	if val := header["Content-Type"]; len(val) == 0 {
+		header["Content-Type"] = value
+	}
+}