parameters: (self, header, value)
docstring: Send a request header line to the server.
  
          For example: h.putheader('Accept', 'text/html')
docstring_summary: Send a request header line to the server.
docstring_tokens: Send a request header line to the server .
function: def putheader(self, header, value):
          """Send a request header line to the server.
  
          For example: h.putheader('Accept', 'text/html')
          """
          if self.__state != _CS_REQ_STARTED:
              raise CannotSendHeader()
  
          self._headers[header] = value
function_tokens: def putheader ( self , header , value ) : if self . __state != _CS_REQ_STARTED : raise CannotSendHeader ( ) self . _headers [ header ] = value