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Name	Type	Actions
AcceptHeader.php	File	Edit
AcceptHeaderItem.php	File	Edit
BinaryFileResponse.php	File	Edit
CHANGELOG.md	File	Edit
ChainRequestMatcher.php	File	Edit
Cookie.php	File	Edit
Exception	Folder
ExpressionRequestMatcher.php	File	Edit
File	Folder
FileBag.php	File	Edit
HeaderBag.php	File	Edit
HeaderUtils.php	File	Edit
InputBag.php	File	Edit
IpUtils.php	File	Edit
JsonResponse.php	File	Edit
LICENSE	File	Edit
ParameterBag.php	File	Edit
README.md	File	Edit
RateLimiter	Folder
RedirectResponse.php	File	Edit
Request.php	File	Edit
RequestMatcher	Folder
RequestMatcher.php	File	Edit
RequestMatcherInterface.php	File	Edit
RequestStack.php	File	Edit
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ResponseHeaderBag.php	File	Edit
ServerBag.php	File	Edit
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StreamedResponse.php	File	Edit
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composer.json	File	Edit

Editing: HeaderBag.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation;

/**
 * HeaderBag is a container for HTTP headers.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @implements \IteratorAggregate<string, list<string|null>>
 */
class HeaderBag implements \IteratorAggregate, \Countable
{
    protected const UPPER = '_ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    protected const LOWER = '-abcdefghijklmnopqrstuvwxyz';

/**
     * @var array<string, list<string|null>>
     */
    protected $headers = [];
    protected $cacheControl = [];

public function __construct(array $headers = [])
    {
        foreach ($headers as $key => $values) {
            $this->set($key, $values);
        }
    }

/**
     * Returns the headers as a string.
     */
    public function __toString(): string
    {
        if (!$headers = $this->all()) {
            return '';
        }

ksort($headers);
        $max = max(array_map('strlen', array_keys($headers))) + 1;
        $content = '';
        foreach ($headers as $name => $values) {
            $name = ucwords($name, '-');
            foreach ($values as $value) {
                $content .= sprintf("%-{$max}s %s\r\n", $name.':', $value);
            }
        }

return $content;
    }

/**
     * Returns the headers.
     *
     * @param string|null $key The name of the headers to return or null to get them all
     *
     * @return array<string, array<int, string|null>>|array<int, string|null>
     */
    public function all(string $key = null): array
    {
        if (null !== $key) {
            return $this->headers[strtr($key, self::UPPER, self::LOWER)] ?? [];
        }

return $this->headers;
    }

/**
     * Returns the parameter keys.
     *
     * @return string[]
     */
    public function keys(): array
    {
        return array_keys($this->all());
    }

/**
     * Replaces the current HTTP headers by a new set.
     */
    public function replace(array $headers = [])
    {
        $this->headers = [];
        $this->add($headers);
    }

/**
     * Adds new headers the current HTTP headers set.
     */
    public function add(array $headers)
    {
        foreach ($headers as $key => $values) {
            $this->set($key, $values);
        }
    }

/**
     * Returns the first header by name or the default one.
     */
    public function get(string $key, string $default = null): ?string
    {
        $headers = $this->all($key);

if (!$headers) {
            return $default;
        }

if (null === $headers[0]) {
            return null;
        }

return (string) $headers[0];
    }

/**
     * Sets a header by name.
     *
     * @param string|string[]|null $values  The value or an array of values
     * @param bool                 $replace Whether to replace the actual value or not (true by default)
     */
    public function set(string $key, string|array|null $values, bool $replace = true)
    {
        $key = strtr($key, self::UPPER, self::LOWER);

if (\is_array($values)) {
            $values = array_values($values);

if (true === $replace || !isset($this->headers[$key])) {
                $this->headers[$key] = $values;
            } else {
                $this->headers[$key] = array_merge($this->headers[$key], $values);
            }
        } else {
            if (true === $replace || !isset($this->headers[$key])) {
                $this->headers[$key] = [$values];
            } else {
                $this->headers[$key][] = $values;
            }
        }

if ('cache-control' === $key) {
            $this->cacheControl = $this->parseCacheControl(implode(', ', $this->headers[$key]));
        }
    }

/**
     * Returns true if the HTTP header is defined.
     */
    public function has(string $key): bool
    {
        return \array_key_exists(strtr($key, self::UPPER, self::LOWER), $this->all());
    }

/**
     * Returns true if the given HTTP header contains the given value.
     */
    public function contains(string $key, string $value): bool
    {
        return \in_array($value, $this->all($key));
    }

/**
     * Removes a header.
     */
    public function remove(string $key)
    {
        $key = strtr($key, self::UPPER, self::LOWER);

unset($this->headers[$key]);

if ('cache-control' === $key) {
            $this->cacheControl = [];
        }
    }

/**
     * Returns the HTTP header value converted to a date.
     *
     * @throws \RuntimeException When the HTTP header is not parseable
     */
    public function getDate(string $key, \DateTime $default = null): ?\DateTimeInterface
    {
        if (null === $value = $this->get($key)) {
            return $default;
        }

if (false === $date = \DateTime::createFromFormat(\DATE_RFC2822, $value)) {
            throw new \RuntimeException(sprintf('The "%s" HTTP header is not parseable (%s).', $key, $value));
        }

return $date;
    }

/**
     * Adds a custom Cache-Control directive.
     */
    public function addCacheControlDirective(string $key, bool|string $value = true)
    {
        $this->cacheControl[$key] = $value;

$this->set('Cache-Control', $this->getCacheControlHeader());
    }

/**
     * Returns true if the Cache-Control directive is defined.
     */
    public function hasCacheControlDirective(string $key): bool
    {
        return \array_key_exists($key, $this->cacheControl);
    }

/**
     * Returns a Cache-Control directive value by name.
     */
    public function getCacheControlDirective(string $key): bool|string|null
    {
        return $this->cacheControl[$key] ?? null;
    }

/**
     * Removes a Cache-Control directive.
     */
    public function removeCacheControlDirective(string $key)
    {
        unset($this->cacheControl[$key]);

$this->set('Cache-Control', $this->getCacheControlHeader());
    }

/**
     * Returns an iterator for headers.
     *
     * @return \ArrayIterator<string, list<string|null>>
     */
    public function getIterator(): \ArrayIterator
    {
        return new \ArrayIterator($this->headers);
    }

/**
     * Returns the number of headers.
     */
    public function count(): int
    {
        return \count($this->headers);
    }

protected function getCacheControlHeader()
    {
        ksort($this->cacheControl);

return HeaderUtils::toString($this->cacheControl, ',');
    }

/**
     * Parses a Cache-Control HTTP header.
     */
    protected function parseCacheControl(string $header): array
    {
        $parts = HeaderUtils::split($header, ',=');

return HeaderUtils::combine($parts);
    }
}

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Editing: HeaderBag.php