How to use the gunicorn.config.Setting function in gunicorn

def test_keyfile():
    assert issubclass(KeyFile, Setting)
    assert KeyFile.name == 'keyfile'
    assert KeyFile.section == 'SSL'
    assert KeyFile.cli == ['--keyfile']
    assert KeyFile.meta == 'FILE'
    assert KeyFile.default is None

name = "on_reload"
    section = "Server Hooks"
    validator = validate_callable(1)
    type = callable

    def on_reload(server):
        pass
    default = staticmethod(on_reload)
    desc = """\
        Called to recycle workers during a reload via SIGHUP.

        The callable needs to accept a single instance variable for the Arbiter.
        """


class WhenReady(Setting):
    name = "when_ready"
    section = "Server Hooks"
    validator = validate_callable(1)
    type = callable

    def when_ready(server):
        pass
    default = staticmethod(when_ready)
    desc = """\
        Called just after the server is started.

        The callable needs to accept a single instance variable for the Arbiter.
        """


class Prefork(Setting):

default = 2
    desc = """\
        The number of seconds to wait for requests on a Keep-Alive connection.

        Generally set in the 1-5 seconds range for servers with direct connection
        to the client (e.g. when you don't have separate load balancer). When
        Gunicorn is deployed behind a load balancer, it often makes sense to
        set this to a higher value.

        .. note::
           ``sync`` worker does not support persistent connections and will
           ignore this option.
        """


class LimitRequestLine(Setting):
    name = "limit_request_line"
    section = "Security"
    cli = ["--limit-request-line"]
    meta = "INT"
    validator = validate_pos_int
    type = int
    default = 4094
    desc = """\
        The maximum size of HTTP request line in bytes.

        This parameter is used to limit the allowed size of a client's
        HTTP request-line. Since the request-line consists of the HTTP
        method, URI, and protocol version, this directive places a
        restriction on the length of a request-URI allowed for a request
        on the server. A server needs this value to be large enough to
        hold any of its resource names, including any information that

* ``eventlet`` - Requires eventlet >= 0.24.1 (or install it via
          ``pip install gunicorn[eventlet]``)
        * ``gevent``   - Requires gevent >= 1.4 (or install it via
          ``pip install gunicorn[gevent]``)
        * ``tornado``  - Requires tornado >= 0.2 (or install it via
          ``pip install gunicorn[tornado]``)
        * ``gthread``  - Python 2 requires the futures package to be installed
          (or install it via ``pip install gunicorn[gthread]``)

        Optionally, you can provide your own worker by giving Gunicorn a
        Python path to a subclass of ``gunicorn.workers.base.Worker``.
        This alternative syntax will load the gevent class:
        ``gunicorn.workers.ggevent.GeventWorker``.
        """

class WorkerThreads(Setting):
    name = "threads"
    section = "Worker Processes"
    cli = ["--threads"]
    meta = "INT"
    validator = validate_pos_int
    type = int
    default = 1
    desc = """\
        The number of worker threads for handling requests.

        Run each worker with the specified number of threads.

        A positive integer generally in the ``2-4 x $(NUM_CORES)`` range.
        You'll want to vary this a bit to find the best for your particular
        application's work load.

"""


class KeyFile(Setting):
    name = "keyfile"
    section = "SSL"
    cli = ["--keyfile"]
    meta = "FILE"
    validator = validate_string
    default = None
    desc = """\
    SSL key file
    """


class CertFile(Setting):
    name = "certfile"
    section = "SSL"
    cli = ["--certfile"]
    meta = "FILE"
    validator = validate_string
    default = None
    desc = """\
    SSL certificate file
    """

class SSLVersion(Setting):
    name = "ssl_version"
    section = "SSL"
    cli = ["--ssl-version"]
    validator = validate_ssl_version

cli = ["--logger-class"]
    meta = "STRING"
    validator = validate_class
    default = "gunicorn.glogging.Logger"
    desc = """\
        The logger you want to use to log events in Gunicorn.

        The default class (``gunicorn.glogging.Logger``) handle most of
        normal usages in logging. It provides error and access logging.

        You can provide your own logger by giving Gunicorn a
        Python path to a subclass like ``gunicorn.glogging.Logger``.
        """


class LogConfig(Setting):
    name = "logconfig"
    section = "Logging"
    cli = ["--log-config"]
    meta = "FILE"
    validator = validate_string
    default = None
    desc = """\
    The log config file to use.
    Gunicorn uses the standard Python logging module's Configuration
    file format.
    """


class LogConfigDict(Setting):
    name = "logconfig_dict"
    section = "Logging"

section = "Server Hooks"
    validator = validate_callable(2)
    type = callable

    def pre_request(worker, req):
        worker.log.debug("%s %s" % (req.method, req.path))
    default = staticmethod(pre_request)
    desc = """\
        Called just before a worker processes the request.

        The callable needs to accept two instance variables for the Worker and
        the Request.
        """


class PostRequest(Setting):
    name = "post_request"
    section = "Server Hooks"
    validator = validate_post_request
    type = callable

    def post_request(worker, req, environ, resp):
        pass
    default = staticmethod(post_request)
    desc = """\
        Called after a worker processes the request.

        The callable needs to accept two instance variables for the Worker and
        the Request.
        """

If not set, the *default_proc_name* setting will be used.
        """


class DefaultProcName(Setting):
    name = "default_proc_name"
    section = "Process Naming"
    validator = validate_string
    default = "gunicorn"
    desc = """\
        Internal setting that is adjusted for each type of application.
        """


class PythonPath(Setting):
    name = "pythonpath"
    section = "Server Mechanics"
    cli = ["--pythonpath"]
    meta = "STRING"
    validator = validate_string
    default = None
    desc = """\
        A comma-separated list of directories to add to the Python path.

        e.g.
        ``'/home/djangoprojects/myproject,/home/python/mylibrary'``.
        """


class Paste(Setting):
    name = "paste"

name = "reload_extra_files"
    action = "append"
    section = "Debugging"
    cli = ["--reload-extra-file"]
    meta = "FILES"
    validator = validate_list_of_existing_files
    default = []
    desc = """\
        Extends :ref:`reload` option to also watch and reload on additional files
        (e.g., templates, configurations, specifications, etc.).

        .. versionadded:: 19.8
        """


class Spew(Setting):
    name = "spew"
    section = "Debugging"
    cli = ["--spew"]
    validator = validate_bool
    action = "store_true"
    default = False
    desc = """\
        Install a trace function that spews every line executed by the server.

        This is the nuclear option.
        """


class ConfigCheck(Setting):
    name = "check_config"
    section = "Debugging"

D            request time in microseconds
        L            request time in decimal seconds
        p            process ID
        {header}i    request header
        {header}o    response header
        {variable}e  environment variable
        ===========  ===========

        Use lowercase for header and environment variable names, and put
        ``{...}x`` names inside ``%(...)s``. For example::

            %({x-forwarded-for}i)s
        """


class ErrorLog(Setting):
    name = "errorlog"
    section = "Logging"
    cli = ["--error-logfile", "--log-file"]
    meta = "FILE"
    validator = validate_string
    default = '-'
    desc = """\
        The Error log file to write to.

        Using ``'-'`` for FILE makes gunicorn log to stderr.

        .. versionchanged:: 19.2
           Log to stderr by default.

        """