Obtain a response from the server. Upon success the most significant digit of the status code is returned. Upon failure, timeout etc., undef is returned. This method is called by response as a method with one argument. Retrieve one line, delimited by CRLF, from the remote server.
Returns undef upon failure.
Unget a line of text from the server. Returns a reference to a list containing the lines, or undef upon failure. All rights reserved.