Commits on Oct 3, 2017

1. Add early hints feature …

   This commit adds the early hints lambda to the headers hash. Users can
   call it to emit the early hints headers. For example:
   
   ```
   class Server
     def call env
       if env["REQUEST_PATH"] == "/"
         env['rack.early_hints'].call("Link" => "</style.css>; rel=preload; as=style\n</script.js>; rel=preload")
         [200, { "X-Hello" => "World" }, ["Hello world!"]]
       else
         [200, { "X-Hello" => "World" }, ["NEAT!"]]
       end
     end
   end
   
   run Server.new
   ```
   
   In this example, the server sends stylesheet and javascript early hints
   if the proxy supports it, it will send H2 pushes to the client.
   
   Of course not every proxy server supports early hints, so to enable the
   early hints feature with puma you have to pass the configuration variable,
   `--early-hints`.
   
   If `ENV['rack.early_hints']` is not set then early hints is not
   supported by the webserver. Early hints is off by default.

   

   eileencodes committed Oct 3, 2017
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   ea37ada View commit details

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