ERROR: $ref Invalid model specified: [Model reference must be in canonical form] [API Gateway: Models]

Question

A 2018 tutorial shows this as working (I'm new to AWS), but I get the following error when using $ref in API Gateway > Models:

**ERROR: Invalid model specified: [Model reference must be in canonical form]  **
```
{
    "type": "array",
    "items":{
      "$ref":"https://api.gateway.amazonaws.com/restapis/evwngv01/models/MusicItem" 
    }  
}
```

From the  2018 Tutorial:
![Enter image description here](/media/postImages/original/IMZ4l6shOvQKawG7x_nw2kSA)

I  checked these docs, tried using ""Ref" instead, but that didnt work.
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-ref.html

https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-mapping-template-reference.html

Thanky ou.

Answer

It appears the URL is not in the correct format in your ref. The format is:

"$ref": "https://apigateway.amazonaws.com/restapis/{restapi_id}/models/{model_name}"

Note, that there is a '.' between api and gateway that shouldn't be there. Also check that the ID of your REST API is correct,  is 'evwngv01' the ID of the REST API you have created.

"$ref":"https://api.gateway.amazonaws.com/restapis/evwngv01/models/MusicItem"

ERROR: $ref Invalid model specified: [Model reference must be in canonical form] [API Gateway: Models]

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