用php模拟登陆报400错，是什么原因

各位达人：我用php爬虫模拟登陆，在不加headers的时候报405错，加上headers报400错，能否指点下解决思路，万分感谢！！

用的代码如下：

    <?php

        // 要访问的目标页面

        $url = "http://s.weibo.com";

        $urls = "https://s.weibo.com";

        // 代理服务器

        define("PROXY_SERVER", "tcp://t.16yun.cn:31111");

        // 隧道身份信息

        define("PROXY_USER", "16YUN123");

        define("PROXY_PASS", "123456");

        $proxyAuth = base64_encode(PROXY_USER . ":" . PROXY_PASS);

        // 设置 Proxy tunnel

        $tunnel = rand(1,10000);

        $headers = implode("\r\n", [

            "Proxy-Authorization: Basic {$proxyAuth}",

            "Proxy-Tunnel: ${tunnel}",

        ]);

        $sniServer = parse_url($urls, PHP_URL_HOST);

        $options = [

            "http" => [

                "proxy"  => PROXY_SERVER,

                "header" => $headers,

                "method" => "GET",

                'request_fulluri' => true,

            ],

            'ssl' => array(

                    'SNI_enabled' => true, // Disable SNI for https over http proxies

                    'SNI_server_name' => $sniServer

            )

        ];

        print($url);

        $context = stream_context_create($options);

        $result = file_get_contents($url, false, $context);

        var_dump($result);

        // 访问 HTTPS 页面

        print($urls);

        $context = stream_context_create($options);

        $result = file_get_contents($urls, false, $context);

        var_dump($result);