Logic App does not get Swagger Data from API App

Question

I'm following the tutorial here: http://azure.microsoft.com/en-us/documentation/articles/app-service-dotnet-deploy-api-app/
I successfully added the API app, but when I add it to a Logic App, it gives the error: "Error fetching swagger api definition. Please try again."
What is going on? I know the swagger is working properly, because I'm able to consume it from the API app.
Thanks,

Answer 1

I have the same issue. Those links don't help and you really have not answered the question.
I'm using the basic WebApi service that is created by visual studio (plain vanilla string inputs/outputs for all the Http Verbs). The swagger works correctly, but when I deploy to my logic app I get:
If I browse to the Api App itself I can see the swagger definitions working correctly but there is indeed a red validation warning. If I click the link, however, the validator returns Http 500 Internal Server Error.
There is some talk on stackoverflow that this is to do with the https certificate that MS is using, and sure enough, if I download the swagger output from the Api App and upload it to a plain http url on another site, it validates correctly.
So: this seems insoluble. The swagger is correct, but is failing validation, and the Api App cannot be consumed by the logic app.
Here is the Api App endpoint showing the error: https://microsoft-apiapp4b8b7674e41e4a8f905a2d8b1e4a745b.azurewebsites.net/swagger/ui/index
And here is the swagger from https://microsoft-apiapp4b8b7674e41e4a8f905a2d8b1e4a745b.azurewebsites.net:443/swagger/docs/v1 
{"swagger":"2.0","info":{"version":"v1","title":"PE-Services-Idml"},"host":"microsoft-apiapp4b8b7674e41e4a8f905a2d8b1e4a745b.azurewebsites.net:443","schemes":["https"],"paths":{"/api/ToEpl":{"get":{"tags":["ToEpl"],"operationId":"ToEpl_Get","consumes":[],"produces":["application/json","text/json","application/xml","text/xml"],"responses":{"200":{"description":"OK","schema":{"type":"array","items":{"type":"string"}}}},"deprecated":false},"post":{"tags":["ToEpl"],"operationId":"ToEpl_Post","consumes":["application/json","text/json","application/xml","text/xml","application/x-www-form-urlencoded"],"produces":[],"parameters":[{"name":"value","in":"body","required":true,"schema":{"type":"string"}}],"responses":{"204":{"description":"No
Content"}},"deprecated":false}},"/api/ToEpl/{id}":{"get":{"tags":["ToEpl"],"operationId":"ToEpl_Get","consumes":[],"produces":["application/json","text/json","application/xml","text/xml"],"parameters":[{"name":"id","in":"path","required":true,"type":"integer","format":"int32"}],"responses":{"200":{"description":"OK","schema":{"type":"string"}}},"deprecated":false},"put":{"tags":["ToEpl"],"operationId":"ToEpl_Put","consumes":["application/json","text/json","application/xml","text/xml","application/x-www-form-urlencoded"],"produces":[],"parameters":[{"name":"id","in":"path","required":true,"type":"integer","format":"int32"},{"name":"value","in":"body","required":true,"schema":{"type":"string"}}],"responses":{"204":{"description":"No
Content"}},"deprecated":false},"delete":{"tags":["ToEpl"],"operationId":"ToEpl_Delete","consumes":[],"produces":[],"parameters":[{"name":"id","in":"path","required":true,"type":"integer","format":"int32"}],"responses":{"204":{"description":"No
Content"}},"deprecated":false}}},"definitions":{}}