class HTTP::Request::Writer

def add_body_type_headers

with
Adds the headers to the header array for the given request body we are working 
def add_body_type_headers
  return if @headers[Headers::CONTENT_LENGTH] || chunked? || (
    @body.source.nil? && %w[GET HEAD DELETE CONNECT].any? do |method|
      @request_header[0].start_with?("#{method} ")
    end
  )
  @request_header << "#{Headers::CONTENT_LENGTH}: #{@body.size}"
end

def add_headers

Adds headers to the request header from the headers array 
def add_headers
  @headers.each do |field, value|
    @request_header << "#{field}: #{value}"
  end
end

def chunked?

Returns true if the request should be sent in chunked encoding. 
def chunked?
  @headers[Headers::TRANSFER_ENCODING] == CHUNKED
end

def connect_through_proxy

Send headers needed to connect through proxy 
def connect_through_proxy
  add_headers
  write(join_headers)
end

def each_chunk

that never happens.
row triggers a pathological case where Nagle is expecting a third write
in order to play nicely with Nagle's algorithm. Making two writes in a
It's important to send the request in a single write call when possible

Yields chunks of request data that should be sent to the socket. 
def each_chunk
  data = join_headers
  @body.each do |chunk|
    data << encode_chunk(chunk)
    yield data
    data.clear
  end
  yield data unless data.empty?
  yield CHUNKED_END if chunked?
end

def encode_chunk(chunk)

Returns the chunk encoded for to the specified "Transfer-Encoding" header. 
def encode_chunk(chunk)
  if chunked?
    chunk.bytesize.to_s(16) << CRLF << chunk << CRLF
  else
    chunk
  end
end

def initialize(socket, body, headers, headline) 

def initialize(socket, body, headers, headline)
  @body           = body
  @socket         = socket
  @headers        = headers
  @request_header = [headline]
end

def join_headers

http request header string
Joins the headers specified in the request into a correctly formatted 
def join_headers
  # join the headers array with crlfs, stick two on the end because
  # that ends the request header
  @request_header.join(CRLF) + (CRLF * 2)
end

def send_request

Writes HTTP request data into the socket. 
def send_request
  each_chunk { |chunk| write chunk }
rescue Errno::EPIPE
  # server doesn't need any more data
  nil
end

def stream

Stream the request to a socket 
def stream
  add_headers
  add_body_type_headers
  send_request
end

def write(data) 

def write(data)
  until data.empty?
    length = @socket.write(data)
    break unless data.bytesize > length
    data = data.byteslice(length..-1)
  end
rescue Errno::EPIPE
  raise
rescue IOError, SocketError, SystemCallError => e
  raise ConnectionError, "error writing to socket: #{e}", e.backtrace
end