Google recaptcha API POST请求给出403禁止错误

Question

POST请求给出以下请求的禁止错误。

来自Google代码存档的代码https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/recaptcha/recaptcha-php-1.11.zip

函数调用如下

$response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/siteverify",
                                      array (
                                             'privatekey' => $privkey,
                                             'remoteip' => $remoteip,
                                             'response' => $response
                                             ) + $extra_params
                                      );

功能如下

function _recaptcha_http_post($host, $path, $data, $port = 80) {

    $req = _recaptcha_qsencode ($data);

    $http_request  = "POST $path HTTP/1.0\r\n";
    $http_request .= "Host: $host\r\n";
    $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
    $http_request .= "Content-Length: " . strlen($req) . "\r\n";
    $http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
    $http_request .= "\r\n";
    $http_request .= $req;

    echo "HTTP_Request - ";
    echo $http_request;

    $response = '';
    if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
            die ('Could not open socket');
    }

    fwrite($fs, $http_request);

    while ( !feof($fs) )
            $response .= fgets($fs, 1160); // One TCP-IP packet
    fclose($fs);
    echo "HTTP_Response - ";
    echo $response;
    $response = explode("\r\n\r\n", $response, 2);


    return $response; }

请求和响应如下

HTTP\U请求=POST/recaptcha/api/siteverify HTTP/1.0主机：www.google。com内容类型：application/x-www-form-urlencoded；内容长度：418用户代理：reCAPTCHA/PHP privatekey=6ldwx7auaaancawardmfaz3mtomr9bpxuo5q7v

HTTP_Response=HTTP/1.0 403禁止内容类型：文本/html；charset=UTF-8日期：星期四，8月15日2019 07:30:28格林尼治标准时间过期：星期四，8月15日2019 07:30:28格林尼治标准时间缓存控制：私有，最大年龄=0 X-Content-Type-Options： nosnff X-Frame-Options： SAMEORIGIN X-XSS-Prot： 1；模式=块服务器： GSE接受范围：无变化：接受编码

Answer 1

403错误是由于请求服务器阻止了出站https连接。服务器设置中允许https连接时。错误消失了。

使用下面的代码代替可达性库。

function isValid() {try {

    $url = 'https://www.google.com/recaptcha/api/siteverify';
    $data = ['secret'   => 'YOUR SECRET KEY',
             'response' => $_POST['g-recaptcha-response'],
             'remoteip' => $_SERVER['REMOTE_ADDR']];

    $options = [
        'http' => [
            'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
            'method'  => 'POST',
            'content' => http_build_query($data) 
        ]
    ];

    $context  = stream_context_create($options);
    $result = file_get_contents($url, false, $context);
    return json_decode($result)->success;
}
catch (Exception $e) {
    echo "Exception";
    return null;
}

}