c# qr code generator open source Internet 4 RAM 6 2 3 5 ISA Server in Visual C#

Generate QR Code in Visual C# Internet 4 RAM 6 2 3 5 ISA Server

Internet 4 RAM 6 2 3 5 ISA Server
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Figure 6-1 Forward caching caches Internet content for internal clients
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In a forward caching scenario, the following actions occur to complete the client request: 1. The Web proxy client sends a request for content located on an Internet Web server. The Web request is intercepted by ISA Server 2004 and forwarded to the Web proxy filter.
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Note By default, the Microsoft Firewall service forwards HTTP requests from Firewall clients and secure network address translation (SecureNAT) clients to the Web proxy service. This means that, when caching is enabled, Web content from all ISA Server clients can be cached.
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2. ISA Server checks whether the requested content is contained in its cache. If the content is not in the cache, or if the content has expired (that is, the header information in the content indicates that it should no longer be served from a cache), ISA Server 2004 forwards the request to the Web server on the Internet. 3. The Web server on the Internet returns the information requested. 4. The ISA Server Web proxy filter places the Web content in its in-memory cache. ISA Server 2004 uses an in-memory cache to store the most frequently requested content. 5. After placing the Web content in the in-memory cache, ISA Server 2004 Web caching server returns the content to the requesting user.
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Lesson 1
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Caching Overview
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6. After a time, the ISA Server 2004 Web proxy filter will copy the contents of the inmemory cache to the disk-based cache. If the content is not frequently accessed, the in-memory cache will flush the content and the only copy of the content on ISA server will reside in the disk-based cache.
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Note The time for an object to remain in the cache is called Time-to-Live (TTL). When ISA Server places an object into its cache, it sets a TTL for the object. ISA Server returns the HTTP object that is stored in its cache to clients until the TTL has expired. ISA Server can set the TTL based on the creation date and the modification date of the object or by using the settings that you configure when you enable Web caching or configure caching rules. Many Web pages use metatags to set expiration dates for content. When a Web page has an expiration date, ISA Server sets the TTL of the object to match the Web page s expiration date.
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Caching Scenarios
ISA Server supports both forward and reverse caching.
Forward caching occurs when a user on the corporate network makes a request for Web content located on an Internet Web server. The user initiates an HTTP, Hypertext Transfer Protocol Secure (HTTPS), or FTP request to an Internet Web server and the request is intercepted by ISA Server. ISA Server retrieves the content from the Internet Web server, stores that content in its cache, and returns the content to the user. Reverse caching occurs when users on the Internet request Web content located on a server on the corporate network that is accessible through a Web publishing rule. When an Internet user requests content from the internal server, ISA Server forwards the request to the Web server. The Web server sends the requested content to ISA Server, which then returns the content to the Internet user who made the request. In this scenario, ISA Server will cache a copy of the requested information so that the next request for the same information can be provided from the ISA Server cache rather than again accessing the internal Web server.
Note When caching is enabled, both forward and reverse caching are enabled. There is no way to disable either forward or reverse caching specifically. If you want to disable the caching of content from a particular Web site, then you must create a caching rule that prohibits it.
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