Nginx中，set $para $1，$1表示路径中正则表达式匹配的第一个参数。
（推荐学习：nginx教程）
以下是一个示例，用以实验$1,$2。如：
location ~/abc/(.*)/(.*) {
set $para1 $1
set $para2 $2
content_by_lua_block {
ngx.say(ngx.var.para1)
ngx.say(ngx.var.para2)
}
}此时，若访问路径为localhost:8080/abc/qwe/asd时，则浏览器会输出。
qwe asd
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