HTTP本质上由一个请求和一个响应组成：浏览器请求一个特定URL(可能还提供补充数据)，服务器用一个响应页面来应答。
HTTP is fundamentally a request-response couple: a browser requests a particular URL, perhaps with supplementary data, and the server answers with a response page.
作为对这种对称结构的补充，客户端应用程序可以访问外部的基于LSID的数据源，比如pdb和基于网关的服务。
In addition to this symmetry, the client applications can access external LSID-based data sources such as PDB and Gateway-based services.
平面文件适配器拾取密码文件，并将其转换为数据处理程序要求的数据结构（补充有关目标服务的信息）。
The flat file adaptor picked up the password file and converted into a data structure required by the data handler, complete with information about the target service.
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