I want to create my Costom Connector from Azure Functions.
I have some simple Azure Functions.

Function Name: Trim
Input: sourceString
Output: outputString
Example Trim - sourceString = " abc ", trimedString= "abc"
Azure Functions "Trim" work well.
and I can call "Trim" by "HTTP - HTTP" action to Azure Function URL,
and I can get value by "Compose - Parse JSON" from "HTTP" action output.
At beginning, I want to start my Custom Connector from my Azure Function "Trim".
But, I stop how can I create swagger for "Trim".
I want to know sample OpenAPI file for Microsoft Flow Custom API.
and I hope to create OpenAPI file by Azure Functions, with input/output parameters definition for create Custom Connector.
Regards,
Yoshihiro Kawabata