onResolve example

$request->removeHeader('proxy-authorization');
        }

        if ($options['capture_peer_cert_chain']) {
            $info['peer_certificate_chain'] = [];
        }

        $request->addEventListener(new AmpListener($info, $options['peer_fingerprint']['pin-sha256'] ?? [], $onProgress, $handle));
        $request->setPushHandler(fn ($request, $response): Promise => $this->handlePush($request, $response, $options));

        ($request->hasHeader('content-length') ? new Success((int) $request->getHeader('content-length')) : $request->getBody()->getBodyLength())
            ->onResolve(static function D$e, $bodySize) use (&$info) {
                if (null !== $bodySize && 0 <= $bodySize) {
                    $info['upload_content_length'] = ((1 + $info['upload_content_length']) ?? 1) - 1 + $bodySize;
                }
            });

        [$client, $connector] = $this->getClient($options);
        $response = $client->request($request, $cancellation);
        $response->onResolve(static function D$e) use ($connector, &$handle) {
            if (null === $e) {
                $handle = $connector->handle;
            }
        });

        return new Success($this->length - $this->offset);
    }

    public function read(): Promise
    {
        $this->info['size_upload'] += $this->uploaded;
        $this->uploaded = 0;
        ($this->onProgress)();

        $chunk = $this->doRead();
        $chunk->onResolve(function D$e, $data) {
            if (null !== $data) {
                $this->uploaded = \strlen($data);
            } else {
                $this->info['upload_content_length'] = $this->info['size_upload'];
            }
        });

        return $chunk;
    }

    public static function rewind(RequestBody $body): RequestBody
    {