Selecting value from list of tuples Elixir

I'm trying to extract values from list of tuples:

s3_headers = %{headers: [{"x-amz-id-2","yQKurzVIApkxxxxxxxxxxxxxxxxxxxxxxxxxxxxxFBINsPxe+7Vc="},
  {"x-amz-request-id", "82xxxxxxxxx23"},
  {"Date", "Thu, 25 May 2017 22:03:09 GMT"},
  {"Last-Modified", "Thu, 25 May 2017 21:42:28 GMT"},
  {"ETag", "\"6f04733333333333333368997\""},
  {"x-amz-meta-original_name", "Screenshot from 2016-11-27 17-32-03.png"},
  {"Accept-Ranges", "bytes"}, {"Content-Type", ""},
  {"Content-Length", "612391"}, {"Server", "AmazonS3"}], status_code: 200}

The way how I manage to do it so far is like this:

{"x-amz-meta-original_name", original_name } = s3_headers |> List.keyfind("x-amz-meta-original_name", 0)
{"Content-Length", content_length }          = s3_headers |> List.keyfind("Content-Length", 0)
{"Content-Type", content_length }            = s3_headers |> List.keyfind("Content-Type", 0)

It feels like overcomplication can you recommend better way ?