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How do I get JSON data from a custom entity

I would like to GET JSON data from drupal 8 custom entity. I am using ubuntu 14.04 and vagrant. For that i have done these steps.

I have taken reference to Create drupal 8 custom entity from this link.

Enable this modules:

  • HAL – Core module
  • HTTP Basic Authentication -Core module
  • RESTful Web Services – Core module
  • Serialization – Core module
  • Restui – Contributed module

RESTui Configuration:

  • redirect to admin/config/services/rest
  • Enable content_entity_example_contact entity

  • GET Settings done for custom entity enter image description here

    Save.

Permissions given for Rest full web services enter image description here

Postman Plugin is integrated in to chrome. below settings is done for postman. enter image description here

Above steps i have done to GET JSON from custom entity but getting error in postman. Any suggestion or starting point will help for me.

Interestingly when i perform similar steps for drupal 8 node entity i am able to GET JSON data.

enter image description here

Thanks

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How do I get JSON data from a custom entity

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