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Figure 22-4: Clients requesting objects through a Web cache Note that a cache is both a server and a client at the same time When it receives requests from and sends responses to a browser, it is a server When it sends requests to and receives responses from an origin server it is a client So why bother with a Web cache What advantages does it have Web caches are enjoying wide-scale deployment in the Internet for at least three reasons First, a Web cache can substantially reduce the response time for a client request, particularly if the bottleneck bandwidth between the client and the origin server is much less than the bottleneck bandwidth between the client and the cache If there is a high-speed connection between the client and the cache, as there often is, and if the cache has the requested object, then the cache will be able to rapidly deliver the object to the client Second, as we will soon illustrate with an example, Web caches can substantially reduce traffic on an institution's access link to the Internet By reducing traffic, the institution (eg, a company or a university) does not have to upgrade bandwidth as quickly, thereby reducing costs Furthermore, Web caches can substantially reduce Web traffic in the Internet as a whole, thereby improving performance for all applications In 1998, over 75% of Internet traffic was Web traffic, so a significant reduction in Web traffic can translate into a significant improvement in Internet performance [Claffy 1998] Third, an Internet dense with Web caches -- eg, at institutional, regional and national levels -- provides an infrastructure for rapid distribution of content, even for content providers who run their sites on low-speed servers behind low-speed access links If such a "resouce-poor" content provider suddenly has popular content to distribute, this popular content will quickly be copied into the Internet caches, and high user demand will be satisfied To gain a deeper understanding of the benefits of caches, let us consider an example in the context of Figure 22-5 In this figure, there are two networks - the institutional network and the Internet The institutional network is a high-speed LAN A router in the institutional network and a router in the Internet are connected by a 15 Mbps link The institutional network consists of a high-speed LAN which is connected to the Internet through a 15 Mbps access link The origin servers are attached to the Internet, but located all over the globe Suppose that the average object size is 100 Kbits and that the average request rate from the institution's browsers to the origin servers is 15 requests per second Also suppose that amount of time it takes from when the router on the Internet side of the access link in Figure 22-5 forwards an HTTP request (within an IP datagram) until it receives the IP datagram (typically, many IP datagrams) containing the corresponding response is two seconds on average Informally, we refer to this last delay as the "Internet delay" The total response time -- that is the time from when a browser requests an object until the browser receives the object -- is the sum of the LAN delay, the access delay (ie, the delay between the two routers) and the Internet delay Let us now do a very crude calculation to estimate this delay The traffic intensity on the LAN (see Section 16) is (15 requests/sec)*(100 Kbits/request)/(10Mbps) = 15 whereas the traffic intensity on access link (from Internet router to institution router) is (15 requests/sec)*(100 Kbits/request)/(15 Mbps) = 1. itextsharp remove text from pdf c# How to replace specific word in pdf using itextsharp C# .net ...
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Remove - 12 examples found. These are the top rated real world C# (CSharp) examples of iTextSharp . text . pdf .PdfDictionary. Remove extracted from open ... By reading this book, you are off to a good start. Keep in mind, however, that Java security is a fastmoving field. Since Java's introduction in 1996, the security landscape has changed dramatically: A traffic intensity of 15 on a LAN typically results in at most tens of milliseconds of delay; hence, we can neglect the LAN delay However, as discussed in Section 16, as the traffic intensity approaches 1 (as is the case of the access link in Figure 22-5), the delay on a link becomes very large and grows without bound Thus, the average response time to satisfy requests is going to be on the order of minutes, if not more, which is unacceptable for the institution's users Clearly something must be done c# remove text from pdf Changing existing text in a PDF using iText – Sampath LK – Medium
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However, if later on I want to remove the text that I added to the PDF , I am having problems with. There is very little information on how this is ... uwp barcode scanner c#, uwp barcode generator, asp net core barcode scanner, c# .net core barcode generator
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