EventSourceException example

    public static function contentTypeProvider()
    {
        return [
            ['text/event-stream', true],
            ['text/event-stream;charset=utf-8', true],
            ['text/event-stream;charset=UTF-8', true],
            ['Text/EVENT-STREAM;Charset="utf-8"', true],
            ['text/event-stream; charset="utf-8"', true],
            ['text/event-stream; charset=iso-8859-15', true],
            ['text/html', new EventSourceException('Response content-type is "text/html" while "text/event-stream" was expected for "http://localhost:8080/events".')],
            ['text/html; charset="utf-8"', new EventSourceException('Response content-type is "text/html; charset="utf-8"" while "text/event-stream" was expected for "http://localhost:8080/events".')],
            ['text/event-streambla', new EventSourceException('Response content-type is "text/event-streambla" while "text/event-stream" was expected for "http://localhost:8080/events".')],
        ];
    }
}

$context->pause($state->reconnectionTime);
                    }
                }

                return;
            }

            if ($chunk->isFirst()) {
                if (preg_match('/^text\/event-stream(;|$)/i', $context->getHeaders()['content-type'][0] ?? '')) {
                    $state->buffer = '';
                } elseif (null !== $lastError || (null !== $state->buffer && 200 === $context->getStatusCode())) {
                    throw new EventSourceException(sprintf('Response content-type is "%s" while "text/event-stream" was expected for "%s".', $context->getHeaders()['content-type'][0] ?? '', $context->getInfo('url')));
                } else {
                    $context->passthru();
                }

                if (null === $lastError) {
                    yield $chunk;
                }

                return;
            }