fix golint issues in rest (#529)

rest/internal/security/withcoderesponsewriter.go

@@ -2,25 +2,30 @@ package security
 
 import "net/http"
 
+// A WithCodeResponseWriter is a helper to delay sealing a http.ResponseWriter on writing code.
 type WithCodeResponseWriter struct {
 	Writer http.ResponseWriter
 	Code   int
 }
 
+// Flush flushes the response writer.
 func (w *WithCodeResponseWriter) Flush() {
 	if flusher, ok := w.Writer.(http.Flusher); ok {
 		flusher.Flush()
 	}
 }
 
+// Header returns the http header.
 func (w *WithCodeResponseWriter) Header() http.Header {
 	return w.Writer.Header()
 }
 
+// Write writes bytes into w.
 func (w *WithCodeResponseWriter) Write(bytes []byte) (int, error) {
 	return w.Writer.Write(bytes)
 }
 
+// WriteHeader writes code into w, and not sealing the writer.
 func (w *WithCodeResponseWriter) WriteHeader(code int) {
 	w.Writer.WriteHeader(code)
 	w.Code = code