"503service unavailable the request was not completed . the server is temporarily overloading or down<br>请求未能完成。服务器承载量超负荷。If the printer didn t want to accept any new clients , then it would respond with a response code of 211 , the response code for "" obexservice unavailable .<br>如果打印机不想接受新客户机,那么它可能用响应代码211来响应,这个代码代表“ obex service unavailable ” 。They aim at making a computer orservice unavailable or unusable by consuming all available network , cpu , storage , or operating system resources such as file handles<br>它们通过消耗所有可用的网络、 cpu 、存储或操作系统资源(比如文件句柄) ,使得一台计算机或一个服务不可用或不能用。These attacks can negatively affect worker productivity , taking down a company s it infrastructure and makingservices unavailable - all this can cost u . s . corporations billions of dollars in downtime and cleanup<br>这些攻击会给工作人员的生产力带来负面影响,会摧垮公司的it基础结构并使公司无法给用户提供服务所有这些都会使美国公司因为当机时间以及清理工作而花费数十亿美元。"
Hello Stackoverflowers experts! I really do need a good start point here. I'm developing an application on iOS and Android, something more or less like whatsapp but with some extra stuff for my work. The problem is, that i'm not quite sure about where to begin with the server side. I mean, for the protocol in the client side i'm using XMPP, now. I want to know the path to learn to achieve the server side. Many of the answers i have read before tells about using BaaS but with the size of the company and that many more people could join etc. Some of the costs are high to keep paying them monthly as in the case of Parse.com.<br>My questions are these:<br>1.- MySQL will be the best for data storage and handling it? 2.- What kind of technology is the best to achieve this, speaking in terms about this will be used in iOS and Android app? Ruby On Rails?, Node.js? PHP? 3.- What is the best way to handle data, meaning photos, videos, etc? The database will be enough? 4.- is XMPP my best choice