Expires header is N/A when uploading to S3.

[jung-hunsoo]

Environment

• Elixir version (elixir -v): 1.7.0 / 1.7.4
• Arc version (mix deps): 0.11.0
• Arc dependencies when applicable (mix deps): :arc_ecto, "0.11.1"
• Operating system: Ubuntu 14.04 / Ubuntu 18.04

Expected behavior

Uploaded files are configured with cache control.

  def s3_object_headers(_, {file, _}) do
    [cache_control: "public",
     content_type: MIME.from_path(file.file_name),
     expires: 600]
  end

Actual behavior

Both cache-control and expires are N/A.

[iamsteeve]

try

  def s3_object_headers(_, {file, _}) do
    [
    # time in seconds
       cache_control: "public, max-age: 6100",
       content_type: MIME.from_path(file.file_name)
     ]
  end