Nginx 是否有单独的请求排队机制

Nginx 是一款非常流行的开源 Web 服务器软件，它具有高性能、高并发的特点，被广泛用于构建高可用、高性能的 Web 应用。在处理大量请求时，是否有单独的请求排队机制是一个重要的问题。

nginx
http {
    upstream rabbitmq_backend {
        server 127.0.0.1:5672;
    }
    
    server {
        ...
        
        location / {
            proxy_pass http://rabbitmq_backend;
        }
    }
}

nginx
http {
    lua_package_path "/path/to/lua/?.lua;;";
    
    server {
        ...
        
        location / {
            access_by_lua_file /path/to/lua/script.lua;
        }
    }
}

lua
local rabbitmq = require "resty.rabbitmqstomp"
local mq, err = rabbitmq:new()
if not mq then
    ngx.log(ngx.ERR, "failed to create RabbitMQ instance: ", err)
    ngx.exit(500)
end
local ok, err = mq:connect{
    host = "127.0.0.1",
    port = 61613,
    login = "guest",
    password = "guest",
    vhost = "/",
}
if not ok then
    ngx.log(ngx.ERR, "failed to connect to RabbitMQ: ", err)
    ngx.exit(500)
end
local ok, err = mq:send{
    destination = "/queue/myqueue",
    body = ngx.var.request_uri,
}
if not ok then
    ngx.log(ngx.ERR, "failed to send message to RabbitMQ: ", err)
    ngx.exit(500)
end
ngx.exit(ngx.HTTP_OK)