added support to webp

Author: Oscar Otero

CHANGELOG.md

@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [3.0.0] - 2019-11-29
+### Added
+- Support for webp responses under the `ImageFormatter` error handler
+
 ### Changed
 - Merged `JpegFormatter`, `GifFormatter` and `PngFormatter` in one `ImageFormatter`.
 - By default, all formatters are used.

src/ErrorFormatter/ImageFormatter.php

@@ -11,6 +11,7 @@ class ImageFormatter extends AbstractFormatter
         'image/gif',
         'image/jpeg',
         'image/png',
+        'image/webp',
     ];
 
     protected function format(Throwable $error, string $contentType): string
@@ -28,6 +29,9 @@ protected function format(Throwable $error, string $contentType): string
             case 'image/png':
                 imagepng($image);
                 break;
+            case 'image/webp':
+                imagewebp($image);
+                break;
         }
 
         return (string) ob_get_clean();