Scala, Hammock - retrieve http response headers and convert JSON to custom object - scala

Question

I have created a simple program which use Hammock(https://github.com/pepegar/hammock) and now I would like to get response from github API with reposne's headers. I created a code like this:
object GitHttpClient extends App {
implicit val decoder = jsonOf[IO, List[GitRepository]]
implicit val interpreter = ApacheInterpreter.instance[IO]
val response = Hammock
.request(Method.GET, uri"https://api.github.com/orgs/github/repos?per_page=3", Map())
.as[List[GitRepository]]
.exec[IO]
.unsafeRunSync()
println(response)
}
case class GitRepository(full_name: String, contributors_url: String)
And it works fine, I got Git data mapped to my object. But now I also want to get headers from response and I cannot do this by simple response.headers. Only when I remove .as[List[GitRepository]] line and have whole HttpResponse I could access headers. Is it possible to get headers without parsing whole HttpResponse?

Answer 1

I solved this problem by using Decoder after received reponse:
val response = Hammock
.request(Method.GET, uri"https://api.github.com/orgs/github/repos?per_page=3", Map())
.exec[IO]
.unsafeRunSync()
println(response.headers("Link") contains ("next"))
println(HammockDecoder[List[GitRepository]].decode(response.entity))