Phoenix.Plugs.ContentTypeFetcher

Parsed documentation:
Plug to parse Accept headers for response content-type

Used by Phoenix.Controller to determine extension of `render/3` template

## Lookup priority

  1. format param of mime extension, ie "html", "json", "xml"
  2. Accept header, ie "text/html,application/xml;q=0.9,*/*;q=0.8"
  3. "text/html" default fallback
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