add_field(key, val) public

[Ruby 1.8.3] Adds header field instead of replace. Second argument val must be a String. See also #[]=, #[] and #get_fields. 

  request.add_field 'X-My-Header', 'a'
  p request['X-My-Header']              #=> "a"
  p request.get_fields('X-My-Header')   #=> ["a"]
  request.add_field 'X-My-Header', 'b'
  p request['X-My-Header']              #=> "a, b"
  p request.get_fields('X-My-Header')   #=> ["a", "b"]
  request.add_field 'X-My-Header', 'c'
  p request['X-My-Header']              #=> "a, b, c"
  p request.get_fields('X-My-Header')   #=> ["a", "b", "c"]
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