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[[_params_forwarding]]
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==== Parameters Forwarding
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The {project_name} initial authorization endpoint request has support for various parameters. Most of the parameters are described in
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http://openid.net/specs/openid-connect-core-1_0.html#AuthorizationEndpoint[OIDC specification]. Some parameters are added automatically by the adapter based
on the adapter configuration. However, there are also a few parameters that can be added on a per-invocation basis. When you open the secured application URI,
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the particular parameter will be forwarded to the {project_name} authorization endpoint.
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For example, if you request an offline token, then you can open the secured application URI with the `scope` parameter like:
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[source]
----
http://myappserver/mysecuredapp?scope=offline_access
----
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and the parameter `scope=offline_access` will be automatically forwarded to the {project_name} authorization endpoint.
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The supported parameters are:
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* scope - Use a space-delimited list of scopes. A space-delimited list typically references link:{adminguide_link}#_client_scopes[Client scopes]
defined on particular client. Note that the scope `openid` will be always be added to the list of scopes by the adapter. For example, if you
enter the scope options `address phone`, then the request to {project_name} will contain the scope parameter `scope=openid address phone`.
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* prompt - {project_name} supports these settings:
** `login` - SSO will be ignored and the {project_name} login page will be always shown, even if the user is already authenticated
** `none` - The login page will never be shown; instead the user will be redirected to the application, with an error if the user
is not yet authenticated. This setting allows you to create a filter/interceptor on the application side and show a custom error page
to the user. See more details in the specification.
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* max_age - Used only if a user is already authenticated. Specifies maximum permitted time for the authentication to persist, measured
from when the user authenticated. If user is authenticated longer than `maxAge`, the SSO is ignored and he must re-authenticate.
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* login_hint - Used to pre-fill the username/email field on the login form.
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* kc_idp_hint - Used to tell {project_name} to skip showing login page and automatically redirect to specified identity provider instead.
More info in the link:{adminguide_link}#_client_suggested_idp[Identity Provider documentation].
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Most of the parameters are described in the http://openid.net/specs/openid-connect-core-1_0.html#AuthorizationEndpoint[OIDC specification].
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The only exception is parameter `kc_idp_hint`, which is specific to {project_name} and contains the name of the identity provider to automatically use.
For more information see the `Identity Brokering` section in link:{adminguide_link}[{adminguide_name}].
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WARNING: If you open the URL using the attached parameters, the adapter will not redirect you to {project_name} if you are already authenticated
in the application. For example, opening $$http://myappserver/mysecuredapp?prompt=login$$ will not automatically redirect you to
the {project_name} login page if you are already authenticated to the application `mysecredapp` . This behavior may be changed in the future.
