diff --git a/format.go b/format.go
new file mode 100644
index 0000000..431ef2b
--- /dev/null
+++ b/format.go
@@ -0,0 +1,21 @@
+package response
+
+import "net/http"
+import "bitbucket.org/ww/goautoneg"
+
+func Format(r *http.Request, handlers map[string]func()) {
+	contentTypes := []string{}
+	for k := range handlers {
+		contentTypes = append(contentTypes, k)
+	}
+
+	accept := r.Header.Get("Accept")
+
+	contentType := goautoneg.Negotiate(accept, contentTypes)
+
+	if handler, ok := handlers[contentType]; ok {
+		handler()
+	} else if handler, ok := handlers["default"]; ok {
+		handler()
+	}
+}