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wiley http essentials protocols for secure scaleable web sites phần 7

Nếu có chỉ là một thay thế vị trí có sẵn, hoặc nếu máy chủ có một ưu đãi đặc biệt cho vị trí một trong số các lựa chọn thay thế, máy chủ bao gồm các uri cho rằng vị trí trong Htcp mon trao đổi cho phép một máy chủ bộ nhớ cache để yêu cầu cập nhật vào bộ nhớ cache khác. | 188 HTTP Essentials deploys the proxy cache as the gateway to the Internet connection. In many cases the proxy server system is also an Internet firewall. To exploit the proxy cache server users within the organization direct their Web browsers to use the proxy for Internet access. All popular Web browsers include the ability to specify a proxy server figure 5.8 shows the relevant configuration screen for Microsoft s Internet Explorer. Properly configured the users browsers will send their HTTP requests to the proxy cache server rather than to actual Web sites. If the proxy has previously cached the content it will as in figure 5.9 return the appropriate HTTP response to the client immediately. Notice that the proxy cache server is able to return the appropriate HTTP response without sending any traffic to the Internet. This behavior not only saves the organization money by reducing the bandwidth requirements for its Internet access connection it also gives the user improved performance. The proxy cache is able to respond to the user immediately without the delay associated with communications across the Internet. One of the practical challenges associated with deploying a proxy cache server is appropriately configuring the users Figure 5.8 Users configure their Web browsers to send requests to a proxy server rather than directly to the Internet. Accelerating HTTP 189 Internet Figure 5.9 If a proxy server already has a copy of a resource in its local cache it can respond directly to the client without communicating with the origin server. Web browsers. Some browsers allow organizations to preconfigure proxy services along with several other options and distribute the preconfigured version within the organization. Preconfiguration is not always simple however and users that download the latest browser version directly from the Internet quickly defeat the organization s efforts. A more foolproof approach relies on Proxy Auto Configuration pac scripts and the Web .