How Web Server Is Associated With The Address

Author: Vikrant Gehlot

If the naming server can find the request, it caches the request so it would not have to contact higher level naming server for the next request to the same server.

The naming server returns the IP address to the browser which uses the IP address to contact the Web server associated with the address. Many web pages contain references to other files that the Web server must provide for the page to be complete however, the browser can request only one file at a time. For example, images referenced in a Web page require a separate request for each image. Thus, the process of displaying a Web page is usually a series of short conversations between the browser and the server. Typically, the browser receives the main page, searches it for other required file references, and then begins to display the main page while requesting the referenced files. That is why you often see image placeholders when a page is loading. The main page contains the references to other URLs that contain the images, but not the images themselves. What the Server does with the request. From the Web server point of view, each conversation is brand new contact.

By default, a Web server services requests on a first come, first served basis. Web servers do not remember any specific browser form one request to another. Parts of a URL the line that you type into the browser address field is a Uniform Resource Locator. The server breaks the requested URL into its component parts. Forward slashes, colons, periods, question marks, and ampersands, called delimiters, make it easy to separate the parts. Each part has a specific function. Server Translates the Path You do not make Web request with real or physical paths instead, you request pages using a virtual path. After parsing the URL, the server translates the virtual path to a physical path name. Server Checks for the Resource the server checks for the requested file. If it does not exist, the server returns an error message. You have probably seen this error message while browsing the web if not, you are luckier than I am. Server Checks Permissions After locating the resource, the server checks to see if the requesting account has sufficient permission to access the resource. For example, if the requesting account is the anonymous account, and the user has requested a file for which that account has no read permission, the server returns an error message. The actual error text depends on the exact error generated.

There are several sub levels for error messages. You can find a complete list of error messages in the IIS Default Web Site Property dialog box. The contents of most error messages are customizable. By default, the server reads error messages text from the HTML files in your windows directory, where windows are the name of your NT directory, usually named Want. How the Server Responds? Graphics files, Word documents, HTML files, ASP files, executable files, CGI Scripts how does the server know how to process the requested file? Actually, server differentiates file types in several different ways. Internet Information Server differentiates file types based on file extensions just like windows Explorer.

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Increasingly XML Is Replacing Complex ASP In The Middle Tier

Author: Vikrant Gehlot

However information entropy is likely to become a significant factor in the corporate workspace before too long even restricting the domain to corporate outranges.

In the near term, mill’s use in managing documents is likely to be oriented towards simple indexing schemes that work by mirroring file structured in xml however as xml concept editor and documents filer become more prevalent it is likely that many documents will be archived in an xml format. Directory structures as mentioned before currently are most frequently representing using the LDAP protocol however the hierarchical structure of LDAP could be fairly easily modified in to an xml format, which means that the same system for representing document information could also work with computer state information. In a similar fashion as database become more integrated with xml standards application that can translate between SQL and the path language will become more common. SQL is not a language that lends itself to use on the internet its structure is verbose the level of information that you need in order to perform a basic query can several lines or pages and the data that is contained with in field is often of a sensitive or protected nature that you do not necessarily want exposed. Typically ASP acts as a buffer between the data and the outside world, but because each ASP essentially has to be generated from scratch this can make for expensive web interfaces.

The xml information can be easily changed from one format to another it can provide both simple and complex validation of data and it can determine through the use of an expensive write to the database. Moreover with the ability to integrate with messaging an XML solution can take the data that is created from with a SQL query and export it to the client as a single unit, without necessarily forcing the entire to refresh itself.

One advantage to this approach over traditional OLE is that OLE requires that both applications be run simultaneously. An XML stream uses the relatively lightweight MSXML component instead and does not even require that the data come from excel.

This integration becomes even more important when the source of the data is located on a machine different then the consumer of the data. With XML it is possible to use Excel as a remote server, generating data to a power point presentation or perhaps to a vision document or may be even heavens forefend to a java applet running in a Netscape browser. From independent manner that points to one of the principle uses of XML in the future. A related venue to this is the area of messaging. Web connections are not always possible especially if you are in a travel intensive occupation such as seals. Messaging lets a salesperson write relent information, such through a web browser or other client application into a messaging cache if they return to information that wad cached on the client. While sophisticated coaching system are needed for standard client application, if you are simply going through a web interface you can leverage XML’s persistence capabilities and structuring to store information until the transaction can be completed.

The barrier hearer between data and programming language blurs, as I indicate earlier in this chapter, and that point survives to highlight yet another axiom that XML introduces.

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Creating Components And Scripts With XML

Author: Vikrant Gehlot

XML has become an integral part of Microsoft’s future development efforts from data access to document storage and retrieval to messaging systems and distributed computing.

This is very much in keeping with their efforts to make data access a seamless part of the operating environment, with that data increasingly expressed as XML. If you are fortunate enough to be able to limit your browser to Internet Explorer 5, you can also take advantage of several features that this browser supports. Internet Explorer 5 was essentially the first internet browser to support XML features implicitly although internet Explorer 4 did have a crude XML parser that was available as an ActiveX control.

Behaviors easily rank as the most useful of these features. A behavior can be thought of as a way of extending HTML tags through scripting. Inbreed Microsoft’s implementation of such features as vector markup Language is accomplished through precisely this mechanism. Moreover, you can create behaviors, such as animated clocks, that you can then insert into your code through a simple HTML declaration. Behaviors are especially useful in creating components for use within your web page without the complications of building active controls. On a recent project it blitz a component talked to an ASP page on the severe for processing the SQL query and returning it as an XML document and then it called a parameterized XSL file to output the data as table. Behaviors maintained state and event information so that the table could respond to mouse over and click events.

Where this could be useful is a help system in which a roll over on an item indented be beforehand brings up a floating help balloon that contains more extensive information about an element’s function. As language such as visual basic and java start to become more XML centric many of the standard components will have options for using XML as the data source. The Tree view control in Visual Basic Version 6 seems almost ideally suited for use fir by XML but you have to have a fairly good knowledge of XML to actually take advantage of this. Over time even standard controls will provide options fir both importing or exporting data and saving or loading in visual state information. One of the lesser known but more useful additions that Internet Explorer 5 brought which it was the windows scripting host which lets you apply scripting behavior to the operating system itself. As an indication of Microsoft’s future programming goals the scripting host is written around an XML shell and gives you way of using XML to set various applications’ configurations.

Managing Document and data space:- The task of managing documents has moved from being a fairly simple operation of maintaining a decent naming convention on your 20 MB hard drive to keeping track of tens of thousands of document produced by thousands of people over a network that could extend all across the world. Without ability to keep track of documents a company’s primary asset its information slowly melts away in a sea of undocumented electrons. This is already happening on the Internet, where significant portions of the web are simply inaccessibly unless you happen to know exactly where something is located.

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