code: function createShareableLink($path)
      {
          Path::checkArg("path", $path);
  
          $response = $this->doPost(
              $this->apiHost,
              $this->appendFilePath("1/shares", $path),
              array(
                  "short_url" => "false",
              ));
  
          if ($response->statusCode === 404) return null;
          if ($response->statusCode !== 200) throw RequestUtil::unexpectedStatus($response);
  
          $j = RequestUtil::parseResponseJson($response->body);
          return self::getField($j, "url");
      }
docs: Creates and returns a public link to a file or folder's "preview page".  This link can be
  used without authentication.  The preview page may contain a thumbnail or some other
  preview of the file, along with a download link to download the actual file.
  
  See <a href="https://www.dropbox.com/developers/core/docs#shares">/shares</a>.
  
  @param string $path
  The Dropbox path to the file or folder you want to create a shareable link to (UTF-8).
  
  @return string
  The URL of the preview page.
  
  @throws Exception