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  database and/or cookies.
* In non-login handlers, use methods such as ``facebook_request()``
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They all take slightly different arguments due to the fact all these
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See the individual service classes below for complete documentation.

Example usage for Google OAuth:

.. testsetup::

    import urllib

.. testcode::

    class GoogleOAuth2LoginHandler(tornado.web.RequestHandler,
                                    tornado.auth.GoogleOAuth2Mixin):
        async def get(self):
            # Google requires an exact match for redirect_uri, so it's
            # best to get it from your app configuration instead of from
            # self.request.full_uri().
            redirect_uri = urllib.parse.urljoin(self.application.settings['redirect_base_uri'],
                self.reverse_url('google_oauth'))
            async def get(self):
                if self.get_argument('code', False):
                    access = await self.get_authenticated_user(
                        redirect_uri=redirect_uri,
                        code=self.get_argument('code'))
                    user = await self.oauth2_request(
                        "https://www.googleapis.com/oauth2/v1/userinfo",
                        access_token=access["access_token"])
                    # Save the user and access token. For example:
                    user_cookie = dict(id=user["id"], access_token=access["access_token"])
                    self.set_signed_cookie("user", json.dumps(user_cookie))
                    self.redirect("/")
                else:
                    self.authorize_redirect(
                        redirect_uri=redirect_uri,
                        client_id=self.get_google_oauth_settings()['key'],
                        scope=['profile', 'email'],
                        response_type='code',
                        extra_params={'approval_prompt': 'auto'})

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                async def get(self):
                    new_entry = await self.oauth2_request(
                        "https://graph.facebook.com/me/feed",
                        post_args={"message": "I am posting from my Tornado application!"},
                        access_token=self.current_user["access_token"])

                    if not new_entry:
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                        return
                    self.finish("Posted a message!")

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        class TwitterLoginHandler(tornado.web.RequestHandler,
                                  tornado.auth.TwitterMixin):
            async def get(self):
                if self.get_argument("oauth_token", None):
                    user = await self.get_authenticated_user()
                    # Save the user using e.g. set_signed_cookie()
                else:
                    await self.authorize_redirect()

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    The user object returned by `~OAuthMixin.get_authenticated_user`
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    .. deprecated:: 6.3
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        All the Twitter methods are documented at http://dev.twitter.com/

        Many methods require an OAuth access token which you can
        obtain through `~OAuthMixin.authorize_redirect` and
        `~OAuthMixin.get_authenticated_user`. The user returned through that
        process includes an 'access_token' attribute that can be used
        to make authenticated requests via this method. Example
        usage:

        .. testcode::

            class MainHandler(tornado.web.RequestHandler,
                              tornado.auth.TwitterMixin):
                @tornado.web.authenticated
                async def get(self):
                    new_entry = await self.twitter_request(
                        "/statuses/update",
                        post_args={"status": "Testing Tornado Web Server"},
                        access_token=self.current_user["access_token"])
                    if not new_entry:
                        # Call failed; perhaps missing permission?
                        await self.authorize_redirect()
                        return
                    self.finish("Posted a message!")

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    * Select a project, or create a new one.
    * Depending on permissions required, you may need to set your app to
      "testing" mode and add your account as a test user, or go through
      a verfication process. You may also need to use the "Enable
      APIs and Services" command to enable specific services.
    * In the sidebar on the left, select Credentials.
    * Click CREATE CREDENTIALS and click OAuth client ID.
    * Under Application type, select Web application.
    * Name OAuth 2.0 client and click Create.
    * Copy the "Client secret" and "Client ID" to the application settings as
      ``{"google_oauth": {"key": CLIENT_ID, "secret": CLIENT_SECRET}}``
    * You must register the ``redirect_uri`` you plan to use with this class
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        Unlike other ``get_authenticated_user`` methods in this package,
        this method does not return any additional information about the user.
        The returned access token can be used with `OAuth2Mixin.oauth2_request`
        to request additional information (perhaps from
        ``https://www.googleapis.com/oauth2/v2/userinfo``)

        Example usage:

        .. testsetup::

            import urllib

        .. testcode::

            class GoogleOAuth2LoginHandler(tornado.web.RequestHandler,
                                           tornado.auth.GoogleOAuth2Mixin):
                async def get(self):
                    # Google requires an exact match for redirect_uri, so it's
                    # best to get it from your app configuration instead of from
                    # self.request.full_uri().
                    redirect_uri = urllib.parse.urljoin(self.application.settings['redirect_base_uri'],
                        self.reverse_url('google_oauth'))
                    async def get(self):
                        if self.get_argument('code', False):
                            access = await self.get_authenticated_user(
                                redirect_uri=redirect_uri,
                                code=self.get_argument('code'))
                            user = await self.oauth2_request(
                                "https://www.googleapis.com/oauth2/v1/userinfo",
                                access_token=access["access_token"])
                            # Save the user and access token. For example:
                            user_cookie = dict(id=user["id"], access_token=access["access_token"])
                            self.set_signed_cookie("user", json.dumps(user_cookie))
                            self.redirect("/")
                        else:
                            self.authorize_redirect(
                                redirect_uri=redirect_uri,
                                client_id=self.get_google_oauth_settings()['key'],
                                scope=['profile', 'email'],
                                response_type='code',
                                extra_params={'approval_prompt': 'auto'})

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              async def get(self):
                redirect_uri = urllib.parse.urljoin(
                    self.application.settings['redirect_base_uri'],
                    self.reverse_url('facebook_oauth'))
                if self.get_argument("code", False):
                    user = await self.get_authenticated_user(
                        redirect_uri=redirect_uri,
                        client_id=self.settings["facebook_api_key"],
                        client_secret=self.settings["facebook_secret"],
                        code=self.get_argument("code"))
                    # Save the user with e.g. set_signed_cookie
                else:
                    self.authorize_redirect(
                        redirect_uri=redirect_uri,
                        client_id=self.settings["facebook_api_key"],
                        extra_params={"scope": "user_posts"})

        .. testoutput::
           :hide:

        This method returns a dictionary which may contain the following fields:

        * ``access_token``, a string which may be passed to `facebook_request`
        * ``session_expires``, an integer encoded as a string representing
          the time until the access token expires in seconds. This field should
          be used like ``int(user['session_expires'])``; in a future version of
          Tornado it will change from a string to an integer.
        * ``id``, ``name``, ``first_name``, ``last_name``, ``locale``, ``picture``,
          ``link``, plus any fields named in the ``extra_fields`` argument. These
          fields are copied from the Facebook graph API
          `user object <https://developers.facebook.com/docs/graph-api/reference/user>`_

        .. versionchanged:: 4.5
           The ``session_expires`` field was updated to support changes made to the
           Facebook API in March 2017.

        .. versionchanged:: 6.0

           The ``callback`` argument was removed. Use the returned awaitable object instead.
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        http://developers.facebook.com/docs/api

        Many methods require an OAuth access token which you can
        obtain through `~OAuth2Mixin.authorize_redirect` and
        `get_authenticated_user`. The user returned through that
        process includes an ``access_token`` attribute that can be
        used to make authenticated requests via this method.

        Example usage:

        .. testcode::

            class MainHandler(tornado.web.RequestHandler,
                              tornado.auth.FacebookGraphMixin):
                @tornado.web.authenticated
                async def get(self):
                    new_entry = await self.facebook_request(
                        "/me/feed",
                        post_args={"message": "I am posting from my Tornado application!"},
                        access_token=self.current_user["access_token"])

                    if not new_entry:
                        # Call failed; perhaps missing permission?
                        self.authorize_redirect()
                        return
                    self.finish("Posted a message!")

        .. testoutput::
           :hide:

        The given path is relative to ``self._FACEBOOK_BASE_URL``,
        by default "https://graph.facebook.com".

        This method is a wrapper around `OAuth2Mixin.oauth2_request`;
        the only difference is that this method takes a relative path,
        while ``oauth2_request`` takes a complete url.

        .. versionchanged:: 3.1
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