Tài liệu Chapter 1:Introduction- Web Client Programming with Perl doc

... be asked to leave. Chapter 1:Introduction- Web Client Programming with Perl So what does Web client programming mean, and what do you need to learn to do it? A web client is an application ... new page appeared. Clients and Servers Your web browser is an example of a web client. The remote machine containing the document you requested is called a web se...

Ngày tải lên: 26/01/2014, 07:20

... Chapter 7: Graphical Examples with Perl/ Tk- P4 Check if Servers Are up: webping For the last example, we'll build a GUI interface that will allow us to check and see if several web ... $mw->after('cancel', $id); } } And finally, webping looks like Figure 7-4. Figure 7-4. webping client 1. I say "we," but I really mean "she" this...

Ngày tải lên: 14/12/2013, 13:15

... engine. Chapter 2: Demystifying the Browser-P1 Before you start writing your own web programs, you have to become comfortable with the fact that your web browser is just another client. Lots ... rendering. But all of that is gravy; without actually negotiating with web servers and retrieving documents via HTTP, the browser would be as useless as a TV without a tuner. HTTP...

Ngày tải lên: 26/01/2014, 07:20

... the client and server are using. 3. Request headers tell the server more information about the client. The client can identify itself and the user to the server, and specify preferred document ... that are modeled after examples from earlier in this chapter. Figure 2-10 shows the structure of a client request. Figure 2-10. Structure of a client request HTTP transactions do...

Ngày tải lên: 26/01/2014, 07:20

... the document, to do page layout, to estimate arrival time, or to skip the document and retrieve a smaller version of the document  Type of the document, to allow the client to examine only documents ... returned by the server with the HEAD method should be exactly the same as the headers returned with a GET request. This method is often used by web clients to verify the document...

Ngày tải lên: 26/01/2014, 07:20

... data with PUT. In practice, a web server may request authorization from the client. Most webmasters won't allow any arbitrary client to publish documents on the server. When prompted with ... the client may continue with its request. 101 Switching Protocols: The server is complying with a client request to switch protocols to the one specified in the Upgrade head...

Ngày tải lên: 26/01/2014, 07:20

... their own document format, GNU info.Some GNU programs have noother form of documentation. Reading online documentation You’ll find a number of HTML documents in the directory /usr/share /doc/ en/books: • ... come with either no man page at all, or with an excuse for a man page (gcc,for example). Toread the online documentation, you need to browse the info files with the info program, or f...

Ngày tải lên: 24/01/2014, 14:20

... panhandle, Alaska is blessed with an abundance of trees suitable for building log homes. The romantic image of a log cabin in the woods is slowly being replaced with log homes hand-crafted from massive ... construction, and structural systems should be checked out by a professional to assure compliance with codes and regulations. This book is not in- tended to supersede either local or...

Ngày tải lên: 17/02/2014, 13:20

... restricted documents. Upon first requesting a restricted document, the web client requests the document without sending an Authorization header. If the server denies access to the document, ... authorization method for the client to use with the WWW-Authenticate header, described later in this chapter. At this point, the client requests the document again, but with an Autho...

Ngày tải lên: 17/10/2013, 19:15