need some help with nginx keep_alive setting

Hello,
could somebody give me a clear explanation for these Nginx config

[code]proxy_http_version 1.1;
proxy_set_header Connection "";
... | Read the rest of http://ift.tt/2gqwCnY

from Web Hosting Talk - Hosting Security and Technology http://ift.tt/2gqwCnY
via https://ifttt.com/ IFTTT