Fix format list to include SVG and other missing supported formats.
Avoid flushes on cerr.
Cosmetics.
Trying to wrap in stringstream to avoid broken error log.
Ooops.
Set minimal support libcurl version.
Report HTTP errors back to the user.
Cover more error codes (not complete).
Log Content-Language.
Log Content-Language.
Work on internationalisation.
HTTP Accept-Language parser.