Inferno test for Smart App Launch - Standalone fails when using POST as the Authorization Request Method.

[MayankShivhare999]

Steps to Reproduce:

1. Navigate to the Inferno test suite for Smart App Launch - Standalone.

2. Enter the following data:
   FHIR Endpoint (required): *******************
   Standalone Client ID (required): *******************
   Standalone Client Secret: *******************
   Standalone Scope: launch/patient openid fhirUser offline_access patient/Medication.rs patient/AllergyIntolerance.rs patient/CarePlan.rs patient/CareTeam.rs patient/Condition.rs patient/Device.rs patient/DiagnosticReport.rs patient/DocumentReference.rs patient/Encounter.rs patient/Goal.rs patient/Immunization.rs patient/Location.rs patient/MedicationRequest.rs patient/Observation.rs patient/Organization.rs patient/Patient.rs patient/Practitioner.rs patient/Procedure.rs patient/Provenance.rs patient/PractitionerRole.rs patient/ServiceRequest.rs patient/RelatedPerson.rs patient/Specimen.rs patient/MedicationDispense.rs patient/Coverage.rs patient/Location.rs

    Proof Key for Code Exchange (PKCE): Enabled
    PKCE Code Challenge Method: S256
    Authorization Request Method: **POST**
    Encryption Method (Confidential Asymmetric Client Auth Only): ES384
    Client Authentication Method: Confidential Symmetric
   

Additional Observations

The test passes when using GET as the Authorization Request Method, with the same data.

[MayankShivhare999]

This issue is coming when I am using US CORE V6.1.0 as Test suits - Smart App Launch 2.0.0.

When I am using ONC CERTIFICATION (G)(10) STANDARDIZED API as Test suits. and using US Core 6.1.0 / USCDI v3 -> SMART App Launch 2.0.0, then I am not facing any issues,

seems There might a bug with Inferno.