HttpReadsInstances

This is probably the typical instance to use, since all http calls occur within Future, allowing recovery.

Note to read json regardless of error response - can define your own:

 HttpReads[HttpResponse].map(_.json.validate[A])

or custom behaviour - define your own:

HttpReads[HttpResponse].map(response => response.status match {
 case 200   => Right(response.body.json.validate[A])
 case 400   => Right(response.body.json.validate[A])
 case other => Left(s"Invalid status code: $other")
})

An opinionated HttpReads which returns None for 404. This does not have any special treatment for 204, as did the previous version. If you need a None for any UpstreamErrorResponse, consider using:

HttpReads[Either[UpstreamErrorResponse, A]].map(_.toOption)

returns the HttpResponse as is - you will be responsible for checking any status codes.

Ignores the response and returns Unit - useful for handling 204 etc. It can be combined with error handling types (e.g. Either[UpstreamErrorResponse, Unit])