Why should I have a 307 redirect ?

[Ph. Gras]

Hi there,

can somebody tell me why I have a 307 redirect response code
when I'm turning my redirect directive to https off ?

# curl -I https://www.avoirun.com
HTTP/1.1 200 OK
Server: nginx
Date: Fri, 29 Sep 2017 21:48:40 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
X-Pingback: https://www.avoirun.com/xmlrpc.php
Link: <https://www.avoirun.com/>; rel=shortlink

# curl -I http://www.avoirun.com
HTTP/1.1 307 Temporary Redirect
Server: nginx
Date: Fri, 29 Sep 2017 21:49:19 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
X-Pingback: http://www.avoirun.com/xmlrpc.php
Location: https://www.avoirun.com

#       location = / {
#               return 301 https://$host$request_uri;
#       }

        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                #try_files $uri $uri/ =404;
                try_files $uri $uri/ /index.php?$args;
                #try_files $uri $uri/ /index.php;
                root /usr/share/wordpress;
                if ($http_user_agent ~ "MJ12bot|SemrushBot|Windows NT 5\.1\; rv:7\.0\.1") {
                        return 403;
                }
        }

Thanks for your help !

Ph. Gras