以前有很多种办法实现这个功能，但是由于各种原因，大多数的尝试都失败了，其中包括太多的对服务端处理的依赖，以及浏览器缓存的不稳定性等。
There have been several attempts to do this before but they have largely failed for a number of reasons including too much reliance on server-side processing or the fickleness of the browser's cache.
表示层需要足够的灵活以支持用不同技术和通过多种设备(浏览器、手机、射频识别器等)完成用户的任务。
The presentation layer needs to be flexible enough to support performing user tasks in different technologies and across a wide range of devices (browsers, mobile, RFID...).
从浏览器发回的响应也可以是多种格式或类型中的一种，包括纯文本、HTML或XML等。
The response sent back from the browser could be one of various types or formats, including but not limited to plain text, HTML, or XML.
从浏览器发回的响应也可以是多种格式或类型中的一种，包括纯文本、HTML或XML等。
The response sent back from the browser could be one of various types or formats, including but not limited to plain text, HTML, or XML.
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