语法: lua_socket_send_lowat <size>
默认: lua_socket_send_lowat 0
环境: http, server, location
控制 cosocket 发送缓冲区 lowat（低水位）的值。
English source:
syntax: lua_socket_send_lowat <size>
default: lua_socket_send_lowat 0
context: http, server, location
Controls the lowat (low water) value for the cosocket send buffer.