Prerequisites: Tornado 6.3 requires Python 3.9 or newer. The following optional packages may be useful: • pycurl is used by the optional tornado.curl_httpclient. Libcurl version 7.22 or higher is required. • pycares recommended that you use a recent version of libcurl and pycurl. Currently the minimum supported version of libcurl is 7.22.0, and the minimum version of pycurl is 7.18.2. It is highly recommended that your libcurl in progress. • prepare_curl_callback (collections.abc.Callable) – If set, will be called with a pycurl.Curl object to allow the application to make additional setopt calls. • proxy_host (str) – HTTP

Prerequisites: Tornado 6.3 requires Python 3.9 or newer. The following optional packages may be useful:pycurl [http://pycurl.io/] is used by the optional tornado.curl_httpclient. Libcurl version 7.22 or higher is required recommended that you use a recent version of libcurl and pycurl. Currently the minimum supported version of libcurl is 7.22.0, and the minimum version of pycurl is 7.18.2. It is highly recommended that your libcurl python.org/3/library/collections.abc.html#collections.abc.Callable – If set, will be called with a pycurl.Curl object to allow the application to make additional setopt calls. proxy_host (str [https://docs