src/EventListener/DeserializeListener.php
private function getFormat(Request $request): string
    {
        /**
         * @var string|null
         */
        $contentType = $request->headers->get('CONTENT_TYPE');
        if (null === $contentType) {
            throw new NotAcceptableHttpException('The "Content-Type" header must exist.');
        }

        $format = $this->formatMatcher->getFormat($contentType);
        if (null === $format || !isset($this->formats[$format])) {
            $supportedMimeTypes = [];
            foreach ($this->formats as $mimeTypes) {
                foreach ($mimeTypes as $mimeType) {
                    $supportedMimeTypes[] = $mimeType;
                }
            }

            throw new NotAcceptableHttpException(sprintf(
                'The content-type "%s" is not supported. Supported MIME types are "%s".',
                $contentType,
                implode('", "', $supportedMimeTypes)
            ));
        }

        return $format;
    }
private function getFormat(Request $request): string
    {
        /**
         * @var string|null
         */
        $contentType = $request->headers->get('CONTENT_TYPE');
        if (null === $contentType) {
            throw new NotAcceptableHttpException('The "Content-Type" header must exist.');
        }

        $format = $this->formatMatcher->getFormat($contentType);
        if (null === $format || !isset($this->formats[$format])) {
            $supportedMimeTypes = [];
            foreach ($this->formats as $mimeTypes) {
                foreach ($mimeTypes as $mimeType) {
                    $supportedMimeTypes[] = $mimeType;
                }
            }

            throw new NotAcceptableHttpException(sprintf(
                'The content-type "%s" is not supported. Supported MIME types are "%s".',
                $contentType,
                implode('", "', $supportedMimeTypes)
            ));
        }

        return $format;
    }
private function getFormat ( Request $ request ) : string { /**
         * @var string|null
         */ $ contentType = $ request -> headers -> get ( 'CONTENT_TYPE' ) ; if ( null === $ contentType ) { throw new NotAcceptableHttpException ( 'The "Content-Type" header must exist.' ) ; } $ format = $ this -> formatMatcher -> getFormat ( $ contentType ) ; if ( null === $ format || ! isset ( $ this -> formats [ $ format ] ) ) { $ supportedMimeTypes = [ ] ; foreach ( $ this -> formats as $ mimeTypes ) { foreach ( $ mimeTypes as $ mimeType ) { $ supportedMimeTypes [ ] = $ mimeType ; } } throw new NotAcceptableHttpException ( sprintf ( 'The content-type "%s" is not supported. Supported MIME types are "%s".' , $ contentType , implode ( '", "' , $ supportedMimeTypes ) ) ) ; } return $ format ; }
Extracts the format from the Content-Type header and check that it is supported.

@throws NotAcceptableHttpException
Extracts the format from the Content - Type header and check that it is supported .