vendor/guzzlehttp/psr7/src/MessageTrait.php

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<?php

declare(strict_types=1);

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\MessageInterface;
use Psr\Http\Message\StreamInterface;

/**
 * Trait implementing functionality common to requests and responses.
 */
trait MessageTrait
{
    /** @var array<string, string[]> Map of all registered headers, as original name => array of values */
    private $headers = [];

    /** @var array<string, string> Map of lowercase header name => original name at registration */
    private $headerNames  = [];

    /** @var string */
    private $protocol = '1.1';

    /** @var StreamInterface|null */
    private $stream;

    public function getProtocolVersion(): string
    {
        return $this->protocol;
    }

    public function withProtocolVersion($version): MessageInterface
    {
        if ($this->protocol === $version) {
            return $this;
        }

        $new = clone $this;
        $new->protocol = $version;
        return $new;
    }

    public function getHeaders(): array
    {
        return $this->headers;
    }

    public function hasHeader($header): bool
    {
        return isset($this->headerNames[strtolower($header)]);
    }

    public function getHeader($header): array
    {
        $header = strtolower($header);

        if (!isset($this->headerNames[$header])) {
            return [];
        }