curl_exec function causes server to drop the connection

Question

I am having a strange issue with the following function that I have written. Briefly, this function connects to a URL and fetches the output by using curl functions. However, when I execute this function, I get a "server unexpectedly dropped the connection" message:

/**
 * Connects to remote URL and posts parameters, returns the result
 *
 * @param string $URL 
 * @param string $ArrayPostParameters 
 * @param string $HTTPRequestType 
 * @param string $HTTPAuth 
 * @param string $HTTPAuthUsername 
 * @param string $HTTPAuthPassword 
 * @param string $ConnectTimeOutSeconds 
 * @param string $ReturnHeaders 
 * @return array
 * @author xxxxxxxxxx
 */
function DataPostToRemoteURL($URL, $ArrayPostParameters, $HTTPRequestType = 'POST', $HTTPAuth = false, $HTTPAuthUsername = '', $HTTPAuthPassword = '', $ConnectTimeOutSeconds = 1, $ReturnHeaders = false)
    {
    $PostParameters = implode('&', $ArrayPostParameters);

    $CurlHandler = curl_init();
        curl_setopt($CurlHandler, CURLOPT_URL, $URL);

        if ($HTTPRequestType == 'GET')
            {
            curl_setopt($CurlHandler, CURLOPT_HTTPGET, true);
            }
        elseif ($HTTPRequestType == 'PUT')
            {
            curl_setopt($CurlHandler, CURLOPT_PUT, true);
            }
        elseif ($HTTPRequestType == 'DELETE')
            {
            curl_setopt($CurlHandler, CURLOPT_CUSTOMREQUEST, 'DELETE');
            }
        else
            {
            curl_setopt($CurlHandler, CURLOPT_POST, true);
            curl_setopt($CurlHandler, CURLOPT_POSTFIELDS, $PostParameters);
            }

        curl_setopt($CurlHandler, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($CurlHandler, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($CurlHandler, CURLOPT_FOLLOWLOCATION, 5);
        curl_setopt($CurlHandler, CURLOPT_CONNECTTIMEOUT, $ConnectTimeOutSeconds);
        curl_setopt($CurlHandler, CURLOPT_TIMEOUT, $ConnectTimeOutSeconds);
        curl_setopt($CurlHandler, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3');

        // The option doesn't work with safe mode or when open_basedir is set.
        if ((ini_get('safe_mode') != false) && (ini_get('open_basedir') != false))
            {
            curl_setopt($CurlHandler, CURLOPT_FOLLOWLOCATION, true);
            }

        if ($ReturnHeaders == true)
            {
            curl_setopt($CurlHandler, CURLOPT_HEADER, true);
            }
        else
            {
            curl_setopt($CurlHandler, CURLOPT_HEADER, false);
            }

        if ($HTTPAuth == true)
            {
            curl_setopt($CurlHandler, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
            curl_setopt($CurlHandler, CURLOPT_USERPWD, $HTTPAuthUsername.':'.$HTTPAuthPassword);
            }

        $RemoteContent = curl_exec($CurlHandler);

    if (curl_error($CurlHandler) != '')
        {
        return array(false, curl_error($CurlHandler));
        }

    curl_close($CurlHandler);   

    return array(true, $RemoteContent);
    }

When I debugged the function, I noticed that curl_exec() function causes this issue. No curl_error message and no PHP error is generated.

Do you have any idea about reason(s)? safe_mode is disabled in PHP.INI for your information.

Thanks for your help in advance!

cOle2 · Accepted Answer · 2009-05-27 15:59:28Z

1

How are you calling this function? If you're leaving the $ConnectTimeOutSeconds option at it's default of 1 your CURLOPT_TIMEOUT setting might be causing the issue as it probably takes more than 1 second to connect and return the page.

answered May 27, 2009 at 15:59

cOle2

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2 Comments

TamTam Over a year ago

Hi, $ConnectTimeOutSeconds is set to 10 or 15 seconds, even if it's set to 1 second, it should be returning "false" instead of causing "server dropped connection unexpectedly" error? Am I wrong?

cOle2 Over a year ago

I get "false" and "Operation timed out" with it set at 1 second. Do you get the same "dropped connection" when $URL is google.com or somesuch?

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