upon an unexpected EOF, tls_error() returns NULL, so log the real reason iomux returned -1.

otherwise it enters an infinite loop where it tries to read, return zero, and tries again...

the parameters need to be added at the end of the path, not at the end of the URL.

Exit with 0 if the response code was in the 2x or 3x range, or with 2 for other codes. It already exits with 1 upon any other error (including parsing errors.) Print the redirect code on 3x to stdout and the meta to stderr for the 1x, 4x, 5x and 6x ranges.