method

fetch

v8.0.0 - Show latest stable - Class: ActionDispatch::Http::Headers

fetch(key, default = DEFAULT)

public

Returns the value for the given key mapped to @env.

If the key is not found and an optional code block is not provided, raises a `KeyError` exception.

If the code block is provided, then it will be run and its result returned.

# File actionpack/lib/action_dispatch/http/headers.rb, line 90
      def fetch(key, default = DEFAULT)
        @req.fetch_header(env_name(key)) do
          return default unless default == DEFAULT
          return yield if block_given?
          raise KeyError, key
        end
      end

fetch

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