gzip,mime: show response header instead of the request one in test message

caddyhttp/gzip/gzip_test.go

@@ -109,10 +109,10 @@ func nextFunc(shouldGzip bool) httpserver.Handler {
 
 		if shouldGzip {
 			if w.Header().Get("Content-Encoding") != "gzip" {
-				return 0, fmt.Errorf("Content-Encoding must be gzip, found %v", r.Header.Get("Content-Encoding"))
+				return 0, fmt.Errorf("Content-Encoding must be gzip, found %v", w.Header().Get("Content-Encoding"))
 			}
 			if w.Header().Get("Vary") != "Accept-Encoding" {
-				return 0, fmt.Errorf("Vary must be Accept-Encoding, found %v", r.Header.Get("Vary"))
+				return 0, fmt.Errorf("Vary must be Accept-Encoding, found %v", w.Header().Get("Vary"))
 			}
 			if _, ok := w.(*gzipResponseWriter); !ok {
 				return 0, fmt.Errorf("ResponseWriter should be gzipResponseWriter, found %T", w)

caddyhttp/mime/mime_test.go

@@ -57,7 +57,7 @@ func nextFunc(shouldMime bool, contentType string) httpserver.Handler {
 	return httpserver.HandlerFunc(func(w http.ResponseWriter, r *http.Request) (int, error) {
 		if shouldMime {
 			if w.Header().Get("Content-Type") != contentType {
-				return 0, fmt.Errorf("expected Content-Type: %v, found %v", contentType, r.Header.Get("Content-Type"))
+				return 0, fmt.Errorf("expected Content-Type: %v, found %v", contentType, w.Header().Get("Content-Type"))
 			}
 			return 0, nil
 		}