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Migrate content length header & co #4547



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Following up the session led by @rossabaker, partially address #4535

  • Add syntax for Header & Select
  • Add implicit from Select[A] to Renderer[A]
  • Migrate some of headers

Only the first commit is more or less interesting where the machinery are introduced. Really appreciate if you could take a look before I stray too far from the path. In particular

  • SimpleHeadersSpec used to take key + value but now only works on value.
  • HeadersSpec


  • migrate the rest of the headers
  • revisit the headers classes to clean up unused method/val (key, name,...) that was from inheritance. I left those as is since I don't know if anyone is using those

@phongngtuan phongngtuan force-pushed the migrate_content_length_header branch from 95b57c9 to 4023d5d Compare March 1, 2021 16:54
@@ -93,6 +96,11 @@ object Renderer {
override def render(writer: Writer, values: Set[T]): writer.type =

implicit def headerSelectRenderer[A](implicit select: v2.Header.Select[A]): Renderer[A] =
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I think this is the only case where an http4s model type appears in this file. If it works putting this on Select instead of Renderer, I think that would be preferrable. I also just want to get this all compiling again, so I'm content to revisit this later.

@rossabaker rossabaker merged commit 9d879c3 into http4s:series/0.22 Mar 2, 2021
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2 participants