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In-kernel Web Server
An in-kernel web server is an unlimited HTTP server that runs in kernel space or equivalent. It is also known as "accelerator". Benefits * Performance: the path taken by data from a source device (i.e. a disk) to a destination device (i.e. a NIC). Proper asynchronous zero-copy interfaces would make this available from user-space. * Scalability: with respect to number of simultaneous clients. Event notification of comparable scalability seems unlikely in user-space. Drawbacks *Security: Kernel processes run with unlimited privileges. *Portability. Every kernel needs a specific implementation route. *Reliability. Failure in the webserver may crash the OS. Implementations *illumos/ Solaris: NCAkmod aka Network Cache and Accelerator (NCA) kernel module * HP-UX: NSAhttp (NSA is an acronym for Network Server Accelerator) *Linux: TUXMesiboIn-kernel real-time messaging server *Windows NT: (part of Internet Information Services, IIS) * SPIN: http *OpenVMS OpenVMS, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HTTP Server
A web server is computer software and underlying hardware that accepts requests via HTTP (the network protocol created to distribute web content) or its secure variant HTTPS. A user agent, commonly a web browser or web crawler, initiates communication by making a request for a web page or other resource using HTTP, and the server responds with the content of that resource or an error message. A web server can also accept and store resources sent from the user agent if configured to do so. The hardware used to run a web server can vary according to the volume of requests that it needs to handle. At the low end of the range are embedded systems, such as a router that runs a small web server as its configuration interface. A high-traffic Internet website might handle requests with hundreds of servers that run on racks of high-speed computers. A resource sent from a web server can be a pre-existing file ( static content) available to the web server, or it can be generate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linux
Linux ( ) is a family of open source Unix-like operating systems based on the Linux kernel, an kernel (operating system), operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically package manager, packaged as a Linux distribution (distro), which includes the kernel and supporting system software and library (computing), libraries—most of which are provided by third parties—to create a complete operating system, designed as a clone of Unix and released under the copyleft GPL license. List of Linux distributions, Thousands of Linux distributions exist, many based directly or indirectly on other distributions; popular Linux distributions include Debian, Fedora Linux, Linux Mint, Arch Linux, and Ubuntu, while commercial distributions include Red Hat Enterprise Linux, SUSE Linux Enterprise, and ChromeOS. Linux distributions are frequently used in server platforms. Many Linux distributions use the word "Linux" in their name, but the Free ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exokernel
Exokernel is an operating system kernel developed by the MIT Parallel and Distributed Operating Systems group, and also a class of similar operating systems. Operating systems generally present hardware resources to applications through high-level abstractions such as (virtual) file systems. The idea behind exokernels is to force as few abstractions as possible on application developers, enabling them to make as many decisions as possible about hardware abstractions. Exokernels are tiny, since functionality is limited to ensuring protection and multiplexing In telecommunications and computer networking, multiplexing (sometimes contracted to muxing) is a method by which multiple analog or digital signals are combined into one signal over a shared medium. The aim is to share a scarce resource†... of resources, which is considerably simpler than conventional microkernels' implementation of message passing and monolithic kernels' implementation of high-level abstractions. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unikernel
A unikernel is a type of computer program that is static linking, statically linked with the operating system code on which it depends. Unikernels are built with a specialized compiler that identifies the operating system services that a program uses and links it with one or more Operating_system#Library, library operating systems that provide them. Such a program requires no separate operating system and can run instead as the guest of a hypervisor. The unikernel architecture builds on concepts developed by Exokernel and Nemesis (operating system), Nemesis in the late 1990s. Design In a library operating system, protection boundaries are pushed to the lowest hardware layers, resulting in: # a set of libraries that implement mechanisms such as those needed to drive hardware or talk network protocols; # a set of policies that enforce access control and isolation in the application layer. The library OS architecture has several advantages and disadvantages compared with convent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Service-oriented Architecture
In software engineering, service-oriented architecture (SOA) is an architectural style that focuses on discrete services instead of a monolithic design. SOA is a good choice for system integration. By consequence, it is also applied in the field of software design where services are provided to the other components by application components, through a communication protocol over a network. A service is a discrete unit of functionality that can be accessed remotely and acted upon and updated independently, such as retrieving a credit card statement online. SOA is also intended to be independent of vendors, products and technologies. Service orientation is a way of thinking in terms of services and service-based development and the outcomes of services. A service has four properties according to one of many definitions of SOA: # It logically represents a repeatable business activity with a specified outcome. # It is self-contained. # It is a black box for its consumers, meaning ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Of Web Server Software
Web server software allows computers to act as web servers. The first web servers supported only static files, such as HTML (and images), but now they commonly allow embedding of server side applications. Some web application frameworks include simple HTTP servers. For example the Django framework provides runserver, and PHP has a built-in server. These are generally intended only for use during initial development. A production server will require a more robust HTTP front-end such as one of the servers listed here. Overview Features Some features may be intentionally not included to web server to avoid featuritis. For example: * TLS/HTTPS may be enabled with a separate stunnel daemon that terminates TLS and redirects raw HTTP packets to http daemon. * NGINX and OpenBSD httpd authors decided not to include CGI interpretation but instead use FastCGI. For OpenBSD was developed a ''slowcgi'' gateway. * BusyBox httpd doesn't have automatically generated directory listing but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WASD .
{{Disambiguation ...
WASD may refer to: * Wallenpaupack Area School District * WASD keys, the default mapping in most video games for the movement for the player using a keyboard * Wide Area Surveillance Division, a VMS web server * Cobalt WASD, a game by Mojang Studios Mojang AB, trading as Mojang Studios, is a Swedish video game developer based in Stockholm. A first-party developer for Xbox Game Studios, the studio is best known for developing the sandbox and survival game ''Minecraft'', the best-selli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OpenVMS
OpenVMS, often referred to as just VMS, is a multi-user, multiprocessing and virtual memory-based operating system. It is designed to support time-sharing, batch processing, transaction processing and workstation applications. Customers using OpenVMS include banks and financial services, hospitals and healthcare, telecommunications operators, network information services, and industrial manufacturers. During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide. It was first announced by Digital Equipment Corporation (DEC) as VAX/VMS (''Virtual Address eXtension/Virtual Memory System'') alongside the VAX-11/780 minicomputer in 1977. OpenVMS has subsequently been ported to run on DEC Alpha systems, the Itanium-based HPE Integrity Servers, and select x86-64 hardware and hypervisors. Since 2014, OpenVMS is developed and supported by VMS Software Inc. (VSI). OpenVMS offers high availability through computer cluster, clustering—the ability t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SPIN (operating System)
The SPIN operating system is a research project implemented in the computer programming language Modula-3, and is an open source project. It is designed with three goals: Flexibility (engineering), flexibility, Defensive programming, safety, and Computer performance, performance. SPIN was developed at the University of Washington. The Kernel (operating system), kernel can be extended by dynamic loading of modules which implement Interface (computing), interfaces that represent Domain of a function, domains. These domains are defined by Modula-3 INTERFACE. All kernel extensions are written in Modula-3 safe subset with metalanguage constructs and Type safety, type safe Type conversion, casting system. The system also issued a special run-time extension compiler. One set of kernel extensions provides an API, application programming interface (API) that emulates the Digital UNIX system call interface. This allows Unix applications to run on SPIN. References External links * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet Information Services
Microsoft IIS (Internet Information Services, IIS, 2S) is an extensible web server created by Microsoft for use with the Windows NT family. IIS supports HTTP, HTTP/2, HTTP/3, HTTPS, FTP, FTPS, SMTP and NNTP. It has been an integral part of the Windows NT family since Windows NT 4.0, though it may be absent from some editions (e.g. Windows XP Home edition), and is not active by default. A dedicated suite of software called SEO Toolkit is included in the latest version of the manager. This suite has several tools for SEO with features for metatag / web coding optimization, sitemaps / robots.txt configuration, website analysis, crawler setting, SSL server-side configuration and more. History The first Microsoft web server was a research project at the European Microsoft Windows NT Academic Centre (EMWAC), part of the University of Edinburgh in Scotland, and was distributed as freeware. However, since the EMWAC server was unable to handle the volume of traffic going to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Http
HTTP (Hypertext Transfer Protocol) is an application layer protocol in the Internet protocol suite model for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web, where hypertext documents include hyperlinks to other resources that the user can easily access, for example by a Computer mouse, mouse click or by tapping the screen in a web browser. Development of HTTP was initiated by Tim Berners-Lee at CERN in 1989 and summarized in a simple document describing the behavior of a client and a server using the first HTTP version, named 0.9. That version was subsequently developed, eventually becoming the public 1.0. Development of early HTTP Requests for Comments (RFCs) started a few years later in a coordinated effort by the Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C), with work later moving to the IETF. HTTP/1 was finalized and fully documented (as version 1.0) in 1996 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
