语法: tcpsock:settimeout(time)
环境: rewrite_by_lua, access_by_lua*, content_by_lua*, ngx.timer.**
对 connect、receive、 基于 receiveuntil 迭代返回，设置随后的 socket 操作的超时时间（毫秒为单位）。
通过该方法设置内容相比这些配置指令有更高的优先级，例如：lua_socket_connect_timeout、 lua_socket_send_timeout、 lua_socket_read_timeout。
注意，该方法 不 会对 lua_socket_keepalive_timeout 有任何影响，这个目的应换用 setkeepalive 的 timeout 参数。
该特性是在 v0.5.0rc1 版本首次引入的。
English source:
syntax: tcpsock:settimeout(time)
context: rewrite_by_lua, access_by_lua*, content_by_lua*, ngx.timer.**
Set the timeout value in milliseconds for subsequent socket operations (connect, receive, and iterators returned from receiveuntil).
Settings done by this method takes priority over those config directives, i.e., lua_socket_connect_timeout, lua_socket_send_timeout, and lua_socket_read_timeout.
Note that this method does not affect the lua_socket_keepalive_timeout setting; the timeout argument to the setkeepalive method should be used for this purpose instead.
This feature was first introduced in the v0.5.0rc1 release.