marshmallow
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:sparkles: Improve error messages for URL validation
Resolves #2243
I'd do it differently. In init function, build the error string from the parameters to specify the kind of URL that is expected (relative, absolute, FQDN,...).
I gave it a quick shot but didn't find a satisfying phrasing. It might look weird for a client to get a response mentioning FQDN for the (default) URL case.