transport/http: enhance the DefaultErrorEncoder#414
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- Errors may implement StatusCoder interface - Errors may implement Headerer interface - Errors may implement json.Marshaler interface
With sane defaults.
This RequestFunc moves many HTTP request parameters to the context under specific keys. If wired in to the transport, those values are available to subsequent endpoints or service methods that receive the context. This can be used to e.g. log transport (HTTP) details in a service logging middleware.
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This provides another mechanism for mapping business-domain errors to transport-domain serialization. It should also help with an upcoming basicauth package.