Internet Explorer 5.5 and later first checks the Automatic Proxy Result Cache to determine whether a proxy was used to connect to the host on previous attempts. When you connect to an Internet site, the FindProxyForURL function is used to determine whether a proxy should be used and which proxy to use. The purpose of the cache is to reduce the client-side processing of the automatic proxy configuration script. ![]() The Automatic Proxy Result Cache is a performance enhancement that Microsoft added to Internet Explorer 5.5 and later. This prevents you from using different proxies to gain access to the same Web server. The caching mechanism (Automatic Proxy Result Cache) is performed on a host basis (that is, not on an URL basis). ![]() When you configure Internet Explorer to use an automatic proxy configuration script, it caches the proxy that is returned by the FindProxyForURL call.
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