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Initiating Login from Tool for Deep Link Flow

LTI Spec Notes
The parameters can either be passed as query parameters using the HTTP GET method or be passed as HTML form values that are auto-submitted in the User Agent, and thus are transmitted via the HTTP POST method.
OpenID Connect Spec Notes
The parameters can either be passed as query parameters using the HTTP GET method or be passed as HTML form values that are auto-submitted in the User Agent, and thus are transmitted via the HTTP POST method.
POST: Form attributes being generated:

iss: https://lti-ri.imsglobal.org (required, the issuer identifier identifying the learning platform)

login_hint: DL1 (required, a platform opaque identifier identifying the user to login)

target_link_uri: https://lti-ri.imsglobal.org/lti/tools/218/deep_link_launches (required, the actual end point that should be executed at the end of the OIDC authentication flow)

lti_message_hint: 262 (required, this is an LTI specific parameter identifying the actual message to be executed. For example it may be the resource link id when the message is a resource link request.)

GET: query parameters being generated:

iss: https://lti-ri.imsglobal.org (required, the issuer identifier identifying the learning platform)

login_hint: DL1 (required, a platform opaque identifier identifying the user to login)

target_link_uri: https://lti-ri.imsglobal.org/lti/tools/218/deep_link_launches (required, the actual end point that should be executed at the end of the OIDC authentication flow)

lti_message_hint: 1128 (required, this is an LTI specific parameter identifying the actual message to be executed. For example it may be the resource link id when the message is a resource link request.)

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