Due to differences in server capacity, external bandwidth, and client demand, some Web servers value cache hits more than others. Assuming that a shared cache knows the extent to which different servers value hits, it may employ a value-sensitive replacement policy in order to generate maximum aggregate value for servers. We consider both the prediction and value aspects of this problem and int...

A great deal of research has been devoted to solving the problem of network congestion posed against the context of increasing Internet traffic. However, there has been little concern regarding improvements of the performance of Internet servers such as Web/Web proxy servers in spite of the projections that the performance bottleneck will shift from networks to endhosts. For example, Web server...

One problem with web servers is that they are sensitive to overload. The servers may become overloaded during temporary traffic peaks when more requests arrive than the server is designed for. Because overload usually occurs rather seldom, it is not economical to overprovision the servers for these traffic peaks, instead admission control mechanisms can be implemented in the servers. This paper...

We present an object-level scalable web framework and discuss our implementation as well as simulation experiences with them. This object-level scalable web framework automatically monitors access patterns, replicates, and maintains large multimedia objects among a set of geographically distributed web servers without the need for full URL replication. This framework employs a traceable RTSP/HT...

Dynamic Web content is gaining in popularity over traditional static HTML as the means of providing Web users with personalized and dynamic information. To enable dynamic content, various technologies have been developed for embedding of script code blocks into static HTML files in order to perform various forms of tasks such as session tracking, bank transactions, financial calculations, produ...

information available on the web can be divided in two main categories. the first category is those information distributed among different websites and servers. the second category is the information gathered in central information databases (infobases) which contain a huge amount of information and are available and searchable through the website representing the infobase. infobase owners sel...

The explosive growth of the Web requires servers to be extensible and configurable. This paper describes our adaptive web server, OpenWebServer that employs a metaarchitecture. It supports dynamic adaptation of feasible design decisions in the web server design space by specifying and coordinating metaobjects that represent various aspects within the web server. We present some examples of syst...

The use of dynamically generated Web content is gaining in popularity over traditional static HTML content. Dynamic Web content is generated on the fly according to the instructions embedded in HTML script files. Such instructions generate HTML by carrying out various forms of tasks such as session tracking, database queries and transactions, dynamic image generation, or even fetching informati...

The Asprox infection weaves a complex chain of dependencies involving bots that perform SQL injections on vulnerable web servers, and visitors whose machines get compromised simply by visiting infected websites. Using real-world data sets, we study Asprox bots, infected web servers, and the malicious infrastructure behind Asprox propagation. We find that themalware-propagation infrastructure in...

Securing and controlling workstation access to the web has never been an easy task for security professionals. Firewalls and access control list on routers alone may not bring an acceptable level of security for your organization. Even if their primary role is to reduce network traffic and improve performance, HTTP proxy servers (also called cache servers) are likely to be installed as an addit...