There are at least 10 official HTTP codes in the 300s.

Created by Rory O’Kane on 2015-10-28; known on 2015-10-28; judged wrong by Rory O’Kane on 2015-10-28.

• Rory O’Kane estimated 60% on 2015-10-28
• Rory O’Kane   judged this prediction wrong on 2015-10-28.
• Rory O’Kane said “There are eight – 300 to 307. Source: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html” on 2015-10-28