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File Content: `PrepareBodyMiddleware.php`

<?php

namespace GuzzleHttp;

use GuzzleHttp\Promise\PromiseInterface;
use Psr\Http\Message\RequestInterface;

/**
 * Prepares requests that contain a body, adding the Content-Length,
 * Content-Type, and Expect headers.
 *
 * @final
 */
class PrepareBodyMiddleware
{
    /**
     * @var callable(RequestInterface, array): PromiseInterface
     */
    private $nextHandler;

    /**
     * @param callable(RequestInterface, array): PromiseInterface $nextHandler Next handler to invoke.
     */
    public function __construct(callable $nextHandler)
    {
        $this->nextHandler = $nextHandler;
    }

    public function __invoke(RequestInterface $request, array $options): PromiseInterface
    {
        $fn = $this->nextHandler;

        // Don't do anything if the request has no body.
        if ($request->getBody()->getSize() === 0) {
            return $fn($request, $options);
        }

        $modify = [];

        // Add a default content-type if possible.
        if (!$request->hasHeader('Content-Type')) {
            if ($uri = $request->getBody()->getMetadata('uri')) {
                if (is_string($uri) && $type = Psr7\MimeType::fromFilename($uri)) {
                    $modify['set_headers']['Content-Type'] = $type;
                }
            }
        }

        // Add a default content-length or transfer-encoding header.
        if (!$request->hasHeader('Content-Length')
            && !$request->hasHeader('Transfer-Encoding')
        ) {
            $size = $request->getBody()->getSize();
            if ($size !== null) {
                $modify['set_headers']['Content-Length'] = $size;
            } else {
                $modify['set_headers']['Transfer-Encoding'] = 'chunked';
            }
        }

        // Add the expect header if needed.
        $this->addExpectHeader($request, $options, $modify);

        return $fn(Psr7\Utils::modifyRequest($request, $modify), $options);
    }

    /**
     * Add expect header
     */
    private function addExpectHeader(RequestInterface $request, array $options, array &$modify): void
    {
        // Determine if the Expect header should be used
        if ($request->hasHeader('Expect')) {
            return;
        }

        $expect = $options['expect'] ?? null;

        // Return if disabled or using HTTP/1.0
        if ($expect === false || $request->getProtocolVersion() === '1.0') {
            return;
        }

        // The expect header is unconditionally enabled
        if ($expect === true) {
            $modify['set_headers']['Expect'] = '100-Continue';

            return;
        }

        // By default, send the expect header when the payload is > 1mb
        if ($expect === null) {
            $expect = 1048576;
        }

        // Always add if the body cannot be rewound, the size cannot be
        // determined, or the size is greater than the cutoff threshold
        $body = $request->getBody();
        $size = $body->getSize();

        if ($size === null || $size >= (int) $expect || !$body->isSeekable()) {
            $modify['set_headers']['Expect'] = '100-Continue';
        }
    }
}

Name	Size	Permission
Cookie	---	0755
Exception	---	0755
Handler	---	0755
BodySummarizer.php	608 bytes	0644
BodySummarizerInterface.php	233 bytes	0644
Client.php	18436 bytes	0644
ClientInterface.php	2901 bytes	0644
ClientTrait.php	9006 bytes	0644
HandlerStack.php	8712 bytes	0644
MessageFormatter.php	7797 bytes	0644
MessageFormatterInterface.php	561 bytes	0644
Middleware.php	11162 bytes	0644
Pool.php	4704 bytes	0644
PrepareBodyMiddleware.php	3127 bytes	0644
RedirectMiddleware.php	8112 bytes	0644
RequestOptions.php	10958 bytes	0644
RetryMiddleware.php	3615 bytes	0644
TransferStats.php	3180 bytes	0644
Utils.php	13159 bytes	0644
functions.php	5676 bytes	0644
functions_include.php	160 bytes	0644

File Content: PrepareBodyMiddleware.php

File Content: `PrepareBodyMiddleware.php`