为什么在PHP中发送POST请求时fsockopen有性能问题而不是fopen？

Question

我尝试了两种不同的实现来模拟发布表单。一用 fsockopen （这里的例子： http://www.faqts.com/knowledge_base/view.phtml/aid/7962）和其他用途 fopen （这里的例子： http://netevil.org/blog/2006/nov/http-post-from-php-without-curl).

我遇到了一些严重的性能问题 fsockopen - 当我使用调试器单步调试它时，一切似乎都工作得很好，但是当我不附加调试器时，页面加载时间很长（可能超过 10 秒）。 fopen 工作完美（而且我不必解析响应标头）。有谁知道为什么 fsockopen 会有这些性能问题吗？和超时设置有关系吗？

我在下面包含了我的代码。

//fsockopen implementation
/**
 * The class that posts form data to a specified URL.
 * @package Core
 * @subpackage Classes
 */
class SU_form_poster_class
{
    /**
     * The file handle which is created when a form is posted.
     * @var resource
     */
    protected $file_handle;

    protected $port;

    protected $timeout;


    /**
     * Creates a new instance of this class.
     * @param int $timeout the timeout (in seconds) to wait for the request
     * @param int $port the port to make the request on
     */
    public function __construct($timeout = 30, $port = 80)
    {
        $this->timeout = $timeout;
        $this->port = $port;
    }

    /**
     * Sends a POST request to a specified page on a specified host with the
     * specified data.
     * @param string $path the part of the URL that specifies the page (including
     * the query string)
     * @param string $host the host part of the URL to post to
     * @param string $request_data the data to be posted in "query string" format,
     * e.g. name1=value1&name2=value2&name3=value3
     */
    public function do_post($path, $host, $request_data)
    {
        $err_num = 0;
        $err_str = '';
        $this->file_handle = fsockopen($host, $this->port, $err_num, $err_str, $this->timeout);
        if (!$this->file_handle)
        {
            throw new RuntimeException($err_str, $err_num);
        }
        else
        {
            $request = 'POST '.$path." HTTP/1.1\r\n".
                'Host: '.$host."\r\n".
                "Content-type: application/x-www-form-urlencoded\r\n".
                'Content-length: '.strlen($request_data)."\r\n\r\n".
                $request_data;

            fputs($this->file_handle, $request);
        }
    }

    /**
     * Retrieves data from the most recent request.
     * @return string the response
     */
    public function get_last_response()
    {
        if (!$this->file_handle)
        {
            throw new RuntimeException('A valid request must be made first.');
        }
        else
        {
            $response = '';
            $linenum = 0;
            while (!feof($this->file_handle))
            {
                $line = fgets($this->file_handle, 1024);
                if ($linenum > 6)
                {
                    $response .= $line;
                }
                ++$linenum;
            }
            fclose($this->file_handle);
            return $response;
        }
    }
}

/**
 * The class that posts form data to a specified URL.
 * @package Core
 * @subpackage Classes
 */
class SU_form_poster_class
{
    /**
     * The file handle which is created when a form is posted.
     * @var resource
     */
    protected $stream;

    /**
     * Sends a POST request to a specified page on a specified host with the
     * specified data.
     * @param string $url
     * @param string $request_data the data to be posted in "query string" format,
     * e.g. name1=value1&name2=value2&name3=value3
     */
    public function do_post($url, $request_data)
    {
        $params = array(
            'http' => array(
                'method' => 'POST', 'content' => $request_data
            )
        );

        $context = stream_context_create($params);
        $this->stream = fopen($url, 'rb', false, $context);
        if (!$this->stream)
        {
            throw new RuntimeException('Stream was not created correctly');
        }
    }

    /**
     * Retrieves data from the most recent request.
     * @return string the response
     */
    public function get_last_response()
    {
        if (!$this->stream)
        {
            throw new RuntimeException('A valid request must be made first.');
        }
        else
        {
            return stream_get_contents($this->stream);
        }
    }
}

Answer 1

HTTP 1.1 连接默认为持久连接。这意味着连接不会自动关闭并且 feof() 在请求超时之前不会返回 true。要解决此问题，请发送 Connection: close header 或使用不支持持久连接的 HTTP 1.0。

Answer 2

有人知道为什么fsockopen会遇到这些性能问题吗？这与超时设置有关吗？

我过去在 ssl 上使用 fsockopen 时遇到过问题 - 但这不是你的要求。

您是否尝试过使用curl_* 系列函数来代替，这可能会有所帮助？