Oauth2.0 Implicit flow is not working

Q&A

• Browser: all
• Method of installation: Docker image
• Swagger-UI version: swaggerapi/swagger-ui:v3.43.0
• Swagger/OpenAPI version: OpenAPI 3.0.1

Content & configuration

Example Swagger/OpenAPI definition:

securitySchemes:
    OAuth2:
      type: oauth2
      flows:
        implicit:
          authorizationUrl: https://oauthUrl/oauth2/authorize
          refreshUrl: https://oauthUrl/oauth2/token
          scopes: {}

Describe the bug you're encountering

When using Oauth2.0 Implicit flow, the authorization flow is carried properly and the Swagger UI shows that the user is authorized. However, if the user tries to make a request, the Swagger UI shows that the token is undefined and the request cannot be carried.

To reproduce...

Steps to reproduce the behavior:

1. Press Authorize button
2. Authorize via implicit flow
3. Execute a request

Screenshots

Authorization seems to be OK...

... but really the token is not obtained

Start by reproducing the implicit-flow authorization with the provided Docker image and OpenAPI 3.0.1 definition, following the three listed steps. Trace how Swagger UI obtains and applies the token after authorization; the issue is done when the token is no longer undefined and is included in the executed request.