Performance improvements when rendering

- Fast path for JSON, XML and plain text rendering

render/redirect.go

@@ -0,0 +1,22 @@
+package render
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type redirectRender struct{}
+
+func (_ redirectRender) Render(w http.ResponseWriter, code int, data ...interface{}) error {
+	req := data[0].(*http.Request)
+	location := data[1].(string)
+	WriteRedirect(w, code, req, location)
+	return nil
+}
+
+func WriteRedirect(w http.ResponseWriter, code int, req *http.Request, location string) {
+	if code < 300 || code > 308 {
+		panic(fmt.Sprintf("Cannot redirect with status code %d", code))
+	}
+	http.Redirect(w, req, location, code)
+}