Header.php

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<?php
namespace Magento\Framework\HTTP;

class Header
{
    protected $_request;

    protected $_converter;

    public function __construct(
        \Magento\Framework\App\RequestInterface $httpRequest,
        \Magento\Framework\Stdlib\StringUtils $converter
    ) {
        $this->_request = $httpRequest;
        $this->_converter = $converter;
    }

    public function getHttpHost($clean = true)
    {
        return $this->_getHttpCleanValue('HTTP_HOST', $clean);
    }

    public function getHttpUserAgent($clean = true)
    {
        return $this->_getHttpCleanValue('HTTP_USER_AGENT', $clean);
    }

    public function getHttpAcceptLanguage($clean = true)
    {
        return $this->_getHttpCleanValue('HTTP_ACCEPT_LANGUAGE', $clean);
    }

    public function getHttpAcceptCharset($clean = true)
    {
        return $this->_getHttpCleanValue('HTTP_ACCEPT_CHARSET', $clean);
    }

    public function getHttpReferer($clean = true)
    {
        return $this->_getHttpCleanValue('HTTP_REFERER', $clean);
    }

    public function getRequestUri($clean = false)
    {
        $uri = $this->_request->getRequestUri();
        if ($clean) {
            $uri = $this->_converter->cleanString($uri);
        }
        return $uri;
    }

    protected function _getHttpCleanValue($var, $clean = true)
    {
        $value = $this->_request->getServer($var, '');
        if ($clean) {
            $value = $this->_converter->cleanString($value);
        }

        return $value;
    }
}