telnet www.google.com 80 in VB.NET

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telnet www.google.com 80
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This runs the Telnet program, a terminal emulation program that lets you connect to remote systems through a text interface. (Telnet is installed on Windows XP by default, but it is optional in Windows Vista. You can add it to Vista through the Control Panel s Programs and Features applet.) Telnet usually connects to TCP/IP port 23, but you can specify any port you want, as we did here with the default WWW port of 80. Your screen may go blank, or it may just sit there, looking dead. If you re lucky, you ll see a connected message, but perhaps not. And that s OK. Your system is connected to Google s web server. Type the following command:
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GET / HTTP/1.0
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Don t miss the spaces surrounding the first slash. Follow this command with two light taps on the Enter key. This command asks the remote system to send the default web page at the top of that server s web hierarchy. And because you asked, it will.
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HTTP/1.0 200 OK Cache-Control: private Content-Type: text/html; charset=ISO-8859-1 Set-Cookie: PREF=ID=1c1dd342e463f3f1:TM=1199325226 :LM=1199325226:S=Pl-4f1fg4yh8Mvw7; expires=Sat, 02-Jan-2010 01:53:46 GMT; path=/; domain=.google.com Server: gws Date: Tue, 01 Jan 2008 01:30:00 GMT Connection: Close <html><head> ...rest of HTML web page content here... </body></html> Connection to host lost.
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Of course, you do not normally see all this. The web browser carries on this dialog for you, and nicely formats the response as a web page. This is actually all there is to the World Wide Web. You have just experienced the major features involved: the transfer of basic data through a TCP/IP port. So, where does programming come in
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Static pages were good for a while, but then the Internet became humdrum. Finally someone had a bright idea: We have a program running on our web server that is responding to clients, and feeding them requested pages. What if we could enhance that program so that, for certain pages, it would call a program or script that would generate the HTML content on the fly, and have that content returned to the client So, they changed the server process. Now, when the client asked for a web page ending with the extension .cgi, the web server process ran a separate script that generated the content. The system also provided a means for some client-supplied content to make its way to the script, making possible customization and personalization features. From there it was a short step to a generic solution. On the Microsoft platform, Internet Information Server supported add-ins that could be called based on the file extension of the requested file. This led to Active Server Pages (ASP), a solution that allowed developers to embed server-side script (often using VBScript, a variation of Visual Basic) right in the HTML content, and have it adjust the content before it was sent to the client. Someone else said, If we can write scripts on the server side, couldn t we also include a client-side script right in the HTML content that a smart web browser could process Before long, client-side and server-side developers were battling it out in the streets, but the battle didn t get very far because all the programmers were exhausted. The cause Programming in script! Whether it s embedding script in HTML (the client side) or generating HTML from script (the server side), script programming is cumbersome, slow, high in bad cholesterol, and almost impossible to debug interactively. Some web script programmers hadn t used a language compiler for years, and were on the verge of lapsing into fatal script-induced comas. You could compile some server-side logic into a DLL and use it to process web pages, but it was far from easy, and these DLLs were still often linked into the HTML content via short scripts. Then came .NET and its support for compiled server-side application development. Script programmers breathed a collective sigh of relief from their hospital beds; they could now use the full power of Visual Studio and .NET languages to build HTML content. And this new system, ASP.NET, was designed so that you could craft entire web applications without even looking at a single HTML tag. The design goal: to make web development nearly identical to desktop application development.
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