重定向后的HTTP响应代码

Question

有一个重定向到服务器的信息,一旦响应来自服务器,我想检查HTTP代码,如果有任何代码以4XX开头,则抛出异常.为此我需要知道如何才能从头部获取HTTP代码？此处还涉及到服务器的重定向,所以我害怕卷曲对我没用.

到目前为止,我已经尝试过这个解决方案,但它很慢并且在我的情况下创建脚本超时.我不想增加脚本超时时间并等待更长时间才能获得HTTP代码.

提前感谢任何建议.

Answer 1

使用get_headers和请求第一个响应行的方法将返回重定向的状态代码(如果有的话),更重要的是,它将执行GET请求,该请求将传输整个文件.

您只需要一个HEAD请求,然后解析标头并返回最后一个状态代码.以下是执行此操作的代码示例,它使用$http_response_header而不是get_headers,但数组的格式是相同的:

$url = 'http://example.com/';

$options['http'] = array(
    'method' => "HEAD",
    'ignore_errors' => 1,
);

$context = stream_context_create($options);

$body = file_get_contents($url, NULL, $context);

$responses = parse_http_response_header($http_response_header);

$code = $responses[0]['status']['code']; // last status code

echo "Status code (after all redirects): $code<br>\n";

$number = count($responses);

$redirects = $number - 1;

echo "Number of responses: $number ($redirects Redirect(s))<br>\n";

if ($redirects)
{
    $from = $url;

    foreach (array_reverse($responses) as $response)
    {
        if (!isset($response['fields']['LOCATION']))
            break;
        $location = $response['fields']['LOCATION'];
        $code = $response['status']['code'];

        echo " * $from -- $code --> $location<br>\n";
        $from = $location;
    }
    echo "<br>\n";
}

/**
 * parse_http_response_header
 *
 * @param array $headers as in $http_response_header
 * @return array status and headers grouped by response, last first
 */
function parse_http_response_header(array $headers)
{
    $responses = array();
    $buffer = NULL;
    foreach ($headers as $header)
    {
        if ('HTTP/' === substr($header, 0, 5))
        {
            // add buffer on top of all responses
            if ($buffer) array_unshift($responses, $buffer);
            $buffer = array();

            list($version, $code, $phrase) = explode(' ', $header, 3) + array('', FALSE, '');

            $buffer['status'] = array(
                'line' => $header,
                'version' => $version,
                'code' => (int) $code,
                'phrase' => $phrase
            );
            $fields = &$buffer['fields'];
            $fields = array();
            continue;
        }
        list($name, $value) = explode(': ', $header, 2) + array('', '');
        // header-names are case insensitive
        $name = strtoupper($name);
        // values of multiple fields with the same name are normalized into
        // a comma separated list (HTTP/1.0+1.1)
        if (isset($fields[$name]))
        {
            $value = $fields[$name].','.$value;
        }
        $fields[$name] = $value;
    }
    unset($fields); // remove reference
    array_unshift($responses, $buffer);

    return $responses;
}

有关更多信息,请参阅:HEAD首先使用PHP Streams,最后它包含示例代码,以及如何执行HEAD请求get_headers.

相关:如何使用PHP检查远程文件是否存在？

Answer 2

就像是:

  $ch = curl_init(); 
  $httpcode = curl_getinfo ($ch, CURLINFO_HTTP_CODE );

你应该尝试HttpEngine类.希望这可以帮助.

-

编辑

$ch = curl_init();
curl_setopt($ch, CURLOPT_USERAGENT, $your_agent_variable);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_REFERER, $your_referer);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 5);
$output = curl_exec($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($httpcode ...)