ContentTypeProcessor.php

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<?php
declare(strict_types=1);

namespace Magento\GraphQl\Controller\HttpHeaderProcessor;

use Magento\Framework\Exception\LocalizedException;
use Magento\GraphQl\Controller\HttpHeaderProcessorInterface;

class ContentTypeProcessor implements HttpHeaderProcessorInterface
{
    public function processHeaderValue(string $headerValue) : void
    {
        if (!$headerValue || strpos($headerValue, 'application/json') === false) {
            throw new LocalizedException(
                new \Magento\Framework\Phrase('Request content type must be application/json')
            );
        }
    }
}