pygeoapi fails OpenAPI validation test

[justb4]

Description pygeoapi, e.g. on demo https://demo.pygeoapi.io/master fails GeoHealthCheck OpenAPI Validation test.

Steps to Reproduce

• run GeoHealthCheck or login on https://demo.geohealthcheck.org/
• add an OGC API Features (WFS3) Resource
• in Edit: configure/add the 'OpenAPI Validation Probe', Save
• click Test button, wait a while..
• Test fails, with message: Validate OpenAPI Compliance:HTTP Error 404: Not Found
• (btw this 404 is from a WPS schema sub-file, as schema YAML-files are crawled, see below)

Expected behavior Test should succeed.

Screenshots/Tracebacks Can be reproduced in GHC in IDE debugger, may already hint at the cause:

Environment

• OS: any
• Python version: any
• pygeoapi version: latest, at least any from jan 28 2020, 10:55 GMT.
• GeoHealthCheck version was from dec 2019, so no changes there.

Additional context I suspect that the following causes the error, and that no code-changes to pygeoapi are required:

• in the full OpenAPI Test, GHC will also crawl any YAML schema advertised, up to all parameters
• somewhere in crawling the schema from https://github.com/opengeospatial/wps-rest-binding/tree/master/core/openapi/schemas a $ref cannot be found (the 404).
• interestingly https://github.com/opengeospatial/wps-rest-binding/tree/master/core/openapi/schemas was updated on jan 28, 2020....

But it remains hard to pinpoint. GHC uses the lib openapi-spec-validator==0.2.8 which signals the error. Best to contact the OGC devs, in particular @bpross-52n.

[justb4]

closing as https://github.com/opengeospatial/wps-rest-binding/issues/63 was fixed and validation passes again.