移动互联网是建立在WAP技术之上的,要真正实现应用需要三个环节,即WAP网关的建设、WAP内容服务器和WAP终端。网关与服务器之间通过HTTP1.1协议进行通信,服务的提供者几乎可以不改动信息的内容,只要增加网关设备,就可以向移动用户提供信息。网关还要完成DNS的功能。这样,终端只需要输入URL就可以得到相应的信息,减少了终端设备上浏览器的负担,使之既简单又廉价。网关的另一个功能是尽可能地减少用户浏览网络的延时,它可以通过与其它信息服务器之间的高速连接,减少信息获取的时间。 WAP规范使用标准的Web代理技术来将无线网络与Web连接起来。通过将处理功能集中在WAP网关中,WAP结构大大减少了手机上的操作负载,因此为手机实现价廉物美提供了基础。例如,一个WAP网关一般可以使用所有的DNS服务来解析URL中使用的域名,因此就不再需要手机来完成这个计算任务,同时,还可以利用WAP网关来为用户提供各种服务并且可以帮助网络服务商防止诈骗和服务利用。一个WAP网关一般包括以下功能: ☆协议网关:协议网关将来自WAP协议栈的请求翻译到WWW协议栈(HTTP和TCP/IP)中; ☆内容编码器和解码器:内容编码器将Web内容翻译成 Mobile Internet is based on the WAP technology, to truly achieve the application needs three links, namely the construction of WAP gateway, WAP content server and WAP terminal. Gateway and server through the HTTP1.1 protocol for communication, service providers can almost change the contents of the information, as long as the gateway device, you can provide information to mobile users. Gateway also to complete the DNS function. In this way, the terminal only needs to input the URL to obtain the corresponding information, reducing the burden of the browser on the terminal device, making it simple and cheap. Another function of the gateway is to reduce the delay of users browsing the network as much as possible, and it can reduce the information acquisition time through high-speed connection with other information servers. The WAP specification uses standard Web proxy technology to connect the wireless network with the Web. By centralizing the processing functions in the WAP gateway, the WAP architecture greatly reduces the operational load on the handset, thus providing the basis for a handset to be inexpensive. For example, a WAP gateway can generally use all its DNS services to resolve domain names used in URLs so that it no longer needs a cell phone to do this computing task. It also uses WAP gateways to provide users with various services and to help the network Service providers to prevent fraud and service utilization. A WAP gateway generally includes the following functions: ☆ Protocol Gateway: The protocol gateway translates requests from the WAP protocol stack into the WWW protocol stack (HTTP and TCP / IP); ☆ Content Encoders and Decoders: Content Encoders translate web content to make