# File lib/em/protocols/header_and_content.rb, line 56
56:       def receive_line line
57:         case @hc_mode
58:         when :discard_blanks
59:           unless line == ""
60:             @hc_mode = :headers
61:             receive_line line
62:           end
63:         when :headers
64:           if line == ""
65:             raise "unrecognized state" unless @hc_headers.length > 0
66:             if respond_to?(:receive_headers)
67:               receive_headers @hc_headers
68:             end
69:             # @hc_content_length will be nil, not 0, if there was no content-length header.
70:             if @hc_content_length.to_i > 0
71:               set_binary_mode @hc_content_length
72:             else
73:               dispatch_request
74:             end
75:           else
76:             @hc_headers << line
77:             if ContentLengthPattern =~ line
78:               # There are some attacks that rely on sending multiple content-length
79:               # headers. This is a crude protection, but needs to become tunable.
80:               raise "extraneous content-length header" if @hc_content_length
81:               @hc_content_length = $1.to_i
82:             end
83:             if @hc_headers.length == 1 and respond_to?(:receive_first_header_line)
84:               receive_first_header_line line
85:             end
86:           end
87:         else
88:           raise "internal error, unsupported mode"
89:         end
90:       end