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Creating Cool Web Sites with HTML, XHTML, and CSS apr phần 2

. Tuy nhiên, lựa chọn quy tắc cũng tăng khá hơn so với giảm tự do. Trong thực tế, phía dưới đường lối cứng rắn yêu cầu chỉ đơn giản là bất cứ điều gì bạn thực hiện phải được duyên dáng phù hợp với cơ sở hạ tầng hiện có. Giao thức chồng và các ứng dụng của bạn có thể được như kỳ lạ như bạn muốn, | 18 Creating Cool Web Sites with HTM L XHTM L and CSS Telnet you will be glad to know is easy to specify in URLs You simply specify the service and the host to which you want to connect. For example to log in to the Massachusetts Institute of Technology s MIT s media laboratory use the following URL telnet media.mit.edu When you use Telnet URLs your Web browser program actually tries to launch a separate external Telnet program to negotiate the Telnet connection which means that nothing happens unless you ve already installed and configured a separate Telnet program such as NCSA Telnet. Netscape Navigator Internet Explorer Mosaic and similar browser programs aren t designed to enable you to directly interact with the remote computer from within the browser. Usenet news via URL Working with Usenet news is somewhat tricky because you must find an existing server that allows you to access it. Many systems don t give you that access even if you pay for a regular dialup account. A list of public Usenet hosts which means hosts that attempt to provide news free of charge to all comers is available on the Net but in my experience only about 5 percent of them actually allow you to connect. If you really want to read Usenet newsgroups and your ISP doesn t offer you access of on the some sort almost all do start at Google Groups at http groups.google.com . web Building a news URL is a straightforward process. Simply type news followed by the exact name of the newsgroup. No slashes are needed or allowed and there s not yet a standard approach for specifying individual articles. Here are two examples news news.answers news comp.sys.ibm-pc.announce The heart of the Web HTTP URLs Although all the services listed so far in this chapter are valuable and interesting when used through a Web browser the capability to connect with other Web servers via HTTP is what really makes the Web revolutionary. The general format for HTTP references is the same as in the FTP references explained .