anchor.diff:     
   
   
  -
  -
  
positive.code:    response,% active response
  
     iolen,   % expected length of data
  
     opts,    % http protocol options
     buffer   % I/O buffer
  
negative.code:    'REQUESTED'/2,  %% server is requested
     'RESPONSE'/2,   %% server is responding
     'STREAM'/2,     %% payload is streamed (chunked)
     'RECV'/2        %% payload is received
  ]). 
  
  