René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"QAPage","mainEntity":{"@type":"Question","name":"What causes a `400` error with message `Server not found for `?","text":"
All of the API endpoints for the test deployment of our Flask app, which is deployed via Amazon API Gateway, are currently returning a response like the one below:
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{\n  \"detail\": \"Server not found for https://vd2gh6uqw3.execute-api.us-west-2.amazonaws.com/api/user\",\n  \"status\": 400,\n  \"title\": \"Bad Request\",\n  \"type\": \"about:blank\"\n}\n
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We depend on the latest pre-release of openapi-core, https://github.com/python-openapi/openapi-core/releases/tag/0.19.0a1.
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The error message leads me to believe that openapi-core is raising a ServerNotFound exception from BasePathFinder.find (here), which is called from BaseAPICallValidator._find_path (here).
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I have a couple of questions:
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Is BaseAPICallValidator for validating requests, responses, or both?
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Why does the validator need to validate the server URL? What exactly does APICallPathFinder._get_servers_iter do? What is the fundamental meaning of a ServerNotFound exception?
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","upvoteCount":1,"answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"
HI @jtherrmann
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the error \"Server not found for https://vd2gh6uqw3.execute-api.us-west-2.amazonaws.com/api/user\" means your OpenAPI specification doesn't define server that match url from your request.
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Is BaseAPICallValidator for validating requests, responses, or both?
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It's a base class for request and response validation
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Why does the validator need to validate the server URL?
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Server is part of OpneAPI specification
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What exactly does APICallPathFinder._get_servers_iter do?
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Finds valid server definition in your specification
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What is the fundamental meaning of a ServerNotFound exception?
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ServerNotFound exception is raised when your request server does not match any defined servers in your specification.
","upvoteCount":2,"url":"https://github.com/python-openapi/openapi-core/discussions/757#discussioncomment-8092412"}}}