Bad response (Integration On Websites)

1

Hi! I use example (Integration On Websites - LanguageTool Wiki).
When I send request I receive ‘Error: couldn’t connect to host’
PHP - 5.5
HTTP

2

Is your site accessible on the web? Then please post the URL and we could try to debug it.

3

Thanks for answer!
Problem is related to port (Our provider closed port 8081)

4

How exactly does your proxy.php script look like?

5 

<?php
// LanguageTool Proxy Script
// requires curl for PHP - on Ubuntu, install with "sudo apt-get install php5-curl"
error_reporting(E_ALL);

function shutdown($curl) {
  // close curl even if the script was aborted, see
  // http://php.net/manual/en/features.connection-handling.php
  curl_close($curl);
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $postText = trim(file_get_contents('php://input'));
  $postText = html_entity_decode($postText, ENT_COMPAT, "UTF-8");
  
  $curl = curl_init();
  try {
    register_shutdown_function('shutdown', $curl);
    curl_setopt($curl, CURLOPT_URL, "https://languagetool.org");
    curl_setopt($curl, CURLOPT_PORT, 8081);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $postText);
    curl_setopt($curl, CURLOPT_HEADER, 0);
    if (isset($_SERVER['HTTP_REFERER'])) {
      curl_setopt($curl, CURLOPT_REFERER, $_SERVER['HTTP_REFERER']);
    }
    $realIp = $_SERVER['REMOTE_ADDR'];
    curl_setopt($curl, CURLOPT_HTTPHEADER, array("X-forwarded-for: $realIp"));
  
    header("Content-Type: text/xml; charset=utf-8");
    //for debugging:
    //header("Content-Type: text/plain");
    if (curl_exec($curl) === false) {
      $errorMessage = curl_error($curl);
      $errorCode = curl_errno($curl);
      if (!$errorMessage && $errorCode == 7) {
        // Actually the message can be empty, e.g. if the Apache server is in "No buffer space available" state...
        $errorMessage = "Could not connect LanguageTool server";   // source: http://curl.haxx.se/libcurl/c/libcurl-errors.html
      }
      print "Error: " . $errorMessage;
      error_log("proxy.php error: $errorMessage, code: $errorCode");
    }
  } finally {
    curl_close($curl);
  }
} else {
  print "Error: this proxy only supports POST requests";
}
?>
6

So it seems couldn't connect to host means exactly that: your server cannot connect https://languagetool.org:8081. You could try logging into your server and call that URL with a command-line based browser like w3m or lynx. If that also doesn’t work, there’s maybe a Firewall that prevents access.