Hands-On RESTful Web Services with Go - Second Edition

Rate limiting our REST API

We can also limit the rate of access to our Nginx proxy server by rate limiting. This provides a directive called limit_conn_zone (http://nginx.org/en/docs/http/ngx_http_limit_conn_module.html#limit_conn_zone). The format of it is this:

limit_conn_zone client_type zone=zone_type:size;

client_type can be one of two types:

• An IP address (limit requests from a given IP address)
• A server name (limit requests from a server)

zone_type also changes in correspondence to client_type. It takes values as per the following table:

Client type	Zone type
$binary_remote_address	addr
$server_name	servers

Nginx has to save a few things in memory to remember the IP addresses and servers for rate limiting. The size parameter ...