Apache Server - What Is Apache Web Server? & Basic Information Of Apache Web Server

what is Apache web server? 


Apache web server is a web server application. web server application conveys web substance to be gotten to through the web. it is generally alluded to as Apache. it is eminent for assuming a key job in the underlying development of the overall web. it is initially founded on NCSA httpd server. advancement of Apache started in mid-1995 after the work on NCS a code slowed down. Apache rapidly surpassed NCSA httpd as the predominant HTTP server. it has remained the most well-known HTTP server being used since April 1996 into 2009. it turned into the primary web server. programming to serve in excess of 100 million sites Apache is created and kept up by an open network of engineers. the improvement happens under the protection of the Apache Software Foundation it is most normally utilized on a Unix-like framework. the product is accessible for a wide assortment of working frameworks including UNIX, FreeBSD Linux, Solaris, Novell, NetWare, OS X, Microsoft Windows, OS 2, TPF, open VMs, and econ station. it is discharged under the Apache License 2 as of June 2013. Apache was evaluated to serve fifty-four point two percent of every single dynamic site and fifty-three point three percent of the best servers overall.
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The first creator of the program is Robert McCool. the product is written in C language. last steady form is 2.4.7 discharged on November 25th, 2013. the official site is httpd.Apache.org. 

According to the Apache site, the name Apache was picked out of regard to the Native American clan Apache. Apache clan had unrivaled abilities in fighting and technique. the Apache HTTP server venture is a shared programming advancement exertion. the endeavors are gone for making a hearty business grade include rich and uninhibitedly accessible source code usage of an HTTP web server. the venture is mutually overseen by a gathering of volunteers situated far and wide. what is more several clients have contributed thoughts code and documentation to the task? Web and the web is utilized to convey a plan and build up the server and its related documentation. this undertaking is a piece of the Apache Software Foundation.


Before we continue I would like to briefly describe the Apache Web Server. 

It's a popular open source web server, and it's one of the technologies that in the flash paper the author's compare against. My intent is not to give a detailed lecture on Apache. That's beyond the scope of the course, but instead, I wanted to give you enough about the architecture of Apache, and how it compares to the models that we discussed in the post. And also the other way around, to understand how these discussions in class, are reflected in real-world designs.
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From a very high level, the software architecture of Apache looks like this. The core component provides the basic server-like capability, so this is accepting connections and managing concurrency. The various modules correspond to different types of functionality that are executed on each request. The specific Apache deployment can be configured to include different types of modules.

For instance, you can have certain security features, some management of dynamic content, or even some of the modules are really responsible for more basic HTTP request processing. The flow of control is sort of similar to the event-driven model that we saw, in the sense that each request passes through all of the modules. Like in the event-driven module each request ultimately passed through all the handlers. However, Apache's a combination of a multiprocess and a multithreaded model. In Apache, a single process, a single instance, is internally a multithreaded, boss/worker process that has dynamic management of the number of threads.

There are some configurable thresholds that can be used to dynamically track when to increase or decrease the number of threads in the pool. The total number of processes, so the MP part of the model, can also be dynamically adjusted, and for these, it's information such as number of outstanding connections, number of pending requests, CPU usage, a number of factors can drive how the number of the threads per process and the total number of processes are adjusted. 
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