title: AWS API Gateway: Issues with importing Swagger API schema
body: <p>I tried to import PetStore schema from Swagger (<a href="http://petstore.swagger.io/v2/swagger.json" rel="noreferrer">http://petstore.swagger.io/v2/swagger.json</a>) but resulted in following errors.
  Can you pls help me understand the issue here?</p>
  
  <p>Errors:</p>
  
  <pre><code>Your API was not imported due to errors in the Swagger file.
  Unable to create model for 'Order': Invalid model specified: Validation Result: warnings : [], errors : [Invalid model schema specified]
  Unable to create model for 'User': Invalid model specified: Validation Result: warnings : [], errors : [Invalid model schema specified]
  Unable to create model for 'Category': Invalid model specified: Validation Result: warnings : [], errors : [Invalid model schema specified]
  Unable to create model for 'Tag': Invalid model specified: Validation Result: warnings : [], errors : [Invalid model schema specified]
  Unable to put method 'POST' on resource at path '/pet': Invalid model name specified: null
  Unable to put method 'PUT' on resource at path '/pet': Invalid model name specified: null
  Unable to put method 'POST' on resource at path '/store/order': Invalid model name specified: null
  Unable to put method 'POST' on resource at path '/user': Invalid model name specified: null
  Unable to put method 'PUT' on resource at path '/user/{username}': Invalid model name specified: null
  Additionally, these warnings were found:
  Unsupported security definition type 'oauth2' for 'petstore_auth'. Ignoring.
  API Key security definition 'api_key' has unexpected name or location. Ignoring.
  Unable to insert model 'Pet' due to an unsatisfied schema reference.
  Reference to model 'Pet' not found. Ignoring.
  Reference to model 'Pet' not found. Ignoring.
  Reference to model 'Pet' not found. Ignoring.
  Reference to model 'Pet' in 200 response to method 'GET /pet/findByStatus' not found. Ignoring.
  Reference to model 'Pet' not found. Ignoring.
  Reference to model 'Pet' in 200 response to method 'GET /pet/findByTags' not found. Ignoring.
  Reference to model 'Pet' not found. Ignoring.
  Invalid format for model application/json for method GET
  Parameter type formData for parameter name not supported. Ignoring.
  Parameter type formData for parameter status not supported. Ignoring.
  Parameter type formData for parameter additionalMetadata not supported. Ignoring.
  Parameter type formData for parameter file not supported. Ignoring.
  Unsupported model type 'MapProperty' in 200 response to method 'GET /store/inventory'. Ignoring.
  Reference to model 'Order' not found. Ignoring.
  Reference to model 'Order' not found. Ignoring.
  Invalid format for model application/json for method GET
  Reference to model 'User' not found. Ignoring.
  Reference to model 'User' not found. Ignoring.
  Request schema for 'POST /user/createWithArray' has a reference to unknown model 'User'. Ignoring.
  API Gateway does not support Swagger's 'default' method response (found on 'POST /user/createWithArray')
  Reference to model 'User' not found. Ignoring.
  Request schema for 'POST /user/createWithList' has a reference to unknown model 'User'. Ignoring.
  API Gateway does not support Swagger's 'default' method response (found on 'POST /user/createWithList')
  Unsupported model type 'StringProperty' in 200 response to method 'GET /user/login'. Ignoring.
  API Gateway does not support Swagger's 'default' method response (found on 'GET /user/logout')
  Reference to model 'User' not found. Ignoring.
  Invalid format for model application/json for method GET
  Reference to model 'User' not found. Ignoring.
  </code></pre>