You really should use Google for that. In doing so you would learn a lot.
Search in Google for
HTTP/1.1" 201 320 "
and you get for example this URL:
HTTP Status Codes
Looking up neon 0.28.4 gave me in the first link
neon is an HTTP and WebDAV client library for Unix systems, with a C language API
As you see, Google is still your best friend. I leave the SVN up to you to find out what it means