Response Headers
There are also a number of headers that are usually sent to the browser by the server, and I will introduce some of the most important ones here. Appendix D includes an extensive list of headers that can be sent by both the browser and the server.
Cache-control
The Cache-control response header was added to HTTP 1.1 to provide more advanced methods of controlling the behavior of caching mechanisms like proxy servers. It is a more powerful replacement for the Pragma: no-cache response header, which is described a bit later. To prevent caching mechanisms from storing the entity sent with the response in their cache, you should use the Cache-control: no-cache response header.
Content-length
Content-length specifies the size of ...
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