title: Laravel Logging to Slack Workbook causes "Curl error (code 3): <url> malformed"
body: <p>I just set up a webhook in Slack to send logging to from my Laravel app.</p>
  
  <p>When the log line executes, this error pops up:</p>
  
  <pre><code>RuntimeException
  Curl error (code 3): &lt;url&gt; malformed
  </code></pre>
  
  <p>Source:</p>
  
  <pre><code>vendor\monolog\monolog\src\Monolog\Handler\Curl\Util.php
  
  {
      while ($retries--) {
          if (curl_exec($ch) === false) {
              $curlErrno = curl_errno($ch);
  
              if (false === in_array($curlErrno, self::$retriableErrorCodes, true) || !$retries) {
                  $curlError = curl_error($ch);
  
                  if ($closeAfterDone) {
                      curl_close($ch);
                  }
  
                  throw new \RuntimeException(sprintf('Curl error (code %s): %s', $curlErrno, $curlError));
              }
  
              continue;
          }
  
          if ($closeAfterDone) {
              curl_close($ch);
          }
          break;
      }
  }
  </code></pre>
  
  <p>The log line:</p>
  
  <pre><code>Log::channel('slack')-&gt;info('hi');
  </code></pre>
  
  <p>Configuration is like this:</p>
  
  <pre><code>    'slack' =&gt; [
          'driver' =&gt; 'slack',
          'url' =&gt; env('https://hooks.slack.com/services/TC3S00PFC/BC411TH4M/YXAu...'),
          'username' =&gt; 'app',
          'emoji' =&gt; ':boom:',
          'level' =&gt; 'info',
      ],
  </code></pre>
  
  <p>I tried with a different webhook url, username.
  Curl is activated in php.
  No other clue...</p>