in src/main/scala/com/gu/http/redirect/resolver/UrlResponseFetcher.scala [67:69]
override def fetchResponseFor(uri: URI)(implicit ec: ExecutionContext): Future[HttpResponseSummary] = for {
response <- getHeadResponse(uri)
} yield HttpResponseSummary(response.statusCode, response.headers().firstValue("Location").toScala.map(LocationHeader.apply))