语法: lua_socket_send_timeout <time>
默认: lua_socket_send_timeout 60s
环境: http, server, location
该指令控制 TCP/unix-domain socket 对象的send方法默认超时时间，这个值可以被settimeout方法覆盖。
<time>参数可以是整数，后面可以跟着像s (秒), ms (毫秒), m (分钟)的单位可选项。 默认的时间单位是s，也就是"秒"。默认值是60s。
该指令是在v0.5.0rc1版本第一次引入。
English source:
syntax: lua_socket_send_timeout <time>
default: lua_socket_send_timeout 60s
context: http, server, location
Controls the default timeout value used in TCP/unix-domain socket object's send method and can be overridden by the settimeout method.
The <time> argument can be an integer, with an optional time unit, like s (second), ms (millisecond), m (minute). The default time unit is s, i.e., "second". The default setting is 60s.
This directive was first introduced in the v0.5.0rc1 release.