nginx 变量相关的map模块与split_clients模块及geo模块和geoip模块及keepalive介绍

Syntax: map string $variable { ... }  # 表示string匹配到{}里的值或变量赋值给$variable
Default: —
Context: http
Syntax: map_hash_bucket_size size;
Default: map_hash_bucket_size 32|64|128; 
Context: http
Syntax: map_hash_max_size size;
Default: map_hash_max_size 2048; 
Context: http
Syntax: m