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HTTP is a simple request/response protocol. When a web server program is listening for messages on port 80 of its computer, the server will respond to a HTTP request from a client computer. The two basic forms of request are GET and POST. Both are requests of the server, but the POST allows the client to enclose data in the body of its request. The server replies with an HTTP RESPONSE. The GET request is simply a request for information. Usually a GET is for information on a web page, but it can also be for a file, such as a download of a program the user is interested in using. A GET request is usually a single line, and might look like this: GET /pub/www/TheProject.html HTTP/1.0 or: GET http://www.w3.org/pub/www/TheProject.html HTTP/1.0 The RESPONSE will include a status line and the data requested. The RESPONSE might look like this: HTTP/1.0 200 OK <HTML> <HEAD> <TITLE>Project Home Page</TITLE> </HEAD> <BODY> [content of the web page, marked with HTML tags--see below] </BODY> </HTML> When the client must provide data in order for the server to perform the requested action, the client uses a POST request. The POST protocol provides for the data to be contained in the body of the POST request. A POST request providing Carl for field fn and Reynolds for field ln might look like this: POST /servelet/SomePhoneBook HTTP/1.0 Content-Length: 19 Content-Type: application/x-www-form-urlencoded fn=Carl&ln=Reynolds The simplicity of the WWW protocol is one of the reasons for its success. It is quite easy to implement both web servers and browsers. In fact, today computer science students often write a simple web server as a programming exercise. Another reason for the success of the WWW is that Tim Berners-Lee and the others made all their code freely available to all. They encouraged the participation of academic and commercial parties, and the resulting collaboration brought millions of people to the WWW. The related technology of the hypertext markup language (HTML) also allows people with limited technical understanding to format information to be made available over a web server. HTML is a text formatting language that browser programs understand. To ready a file for presentation as a web page, the author marks up the text with HTML tags which tell the browser how to present the information. Many students today, from all disciplines, create their own web pages, having learned enough HTML on their own to do an adequate job, or having purchased an inexpensive program to help them do it. There are many books and web pages available to help web authors learn HTML, so we will not provide a full tutorial here. However we will show an example web page that demonstrates the general use and form of HTML. There are 80 to 100 tags in HTML that tell the browser what to do with the text on the page. For instance, the <P> tag marks the beginning of a paragraph. Each tag has a closing form, which is the same as the opening form, except that a forward slash precedes the tag. The closing tag for a paragraph is </P>. One can use uppercase and lowercase interchangeably for the tags; <P> and <p> will work equally well.
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Many of the tags have attributes one can set to modify their effect. One sets the attribute value by including the attribute name in the opening tag, following the attribute name with the equal sign, and following that with the value of the attribute in quotation marks. For instance: <H1 ALIGN="center"> Carl Reynolds Home Page</H1> This line will cause the text to be in the size of a large heading (H1), and the text will be centered on the line. One can add comments to a HTML file by starting with the four characters <!-- and ending with the three characters -->. For instance: <!-- Any browser will ignore this comment --> One of the beauties of the HTML standard is that it is pretty forgiving of errors. If a browser does not understand the HTML on a page, the browser simply displays what it can. The browser will not crash or issue cryptic error messages; the browser will simply do the best it can. So, all is not lost if the author forgets to include the closing form for a paragraph, for example. As an example, Figure 7-3 is a simplification of the home page of one of the authors.
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