Tài liệu Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P4 docx
Tài liệu Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P4 docx
... 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 sites ... similar to the UNIX ping command, we call it webping. This
application would be useful to a web administrator who had to keep track of
many different web sites, and wanted to...
Tài liệu Web Client Programming with Perl-Chapter 2: Demystifying the Browser-P1 pdf
... 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
of complex things are happening: ...
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 may s...
Tài liệu Web Client Programming with Perl-Chapter 2: Demystifying the Browser-P2 doc
... some queries 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 ...
perform some HTTP requests without supplying any header information at
all. A request of GET / HTTP/1.0 with an empty header is sufficient for
most servers to understand the client....
Tài liệu Web Client Programming with Perl-Chapter 3: Learning HTTP- P1 pdf
... that it seemed best to present it this way.
Client Request Methods
A client request method is a "command" or "request" that a web client issues
to a server. You can think ... request. This method is often used by web
clients to verify the document's existence or properties (like Content-
length or Content-type), but the client has no intention of retrie...
Tài liệu Web Client Programming with Perl-Chapter 3: Learning HTTP- P2 pdf
... 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...
Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P1
... Chapter 7: Graphical Examples with Perl/Tk- P1
The Tk extension to Perl can be used to create a Graphical User Interface
(GUI) to your Perl programs ... show a few examples of Tk-based web clients, which go
beyond the command-line interface that we've been using so far in this
book:[1]
xword, a dictionary client
track, a graphical ... program that will just...
Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P2
... Chapter 7: Graphical Examples with Perl/Tk- P2
The do_search( ) function will take an optional $url argument, to give ... call our function,
do_search( ), with the URL we extracted from the HTML tag. Then we
insert the text for the link into the text widget, and associate it with the tag
we just built.
Figure ... minutes.
For this example, we'll interact with the...
Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P3
... Chapter 7: Graphical Examples with Perl/Tk- P3
Our destinations list is an almost exact copy of the list you'd see on the web
page. For ease in using, we placed ... going to use a default of today for the date field. The FedEx web
page expects it in the form of "DayMonthYear", and digits with only one
number require a leading zero. The string returned ......
Tài liệu A Client-Centered Approach to Reproductive Health: A Trainer’s Manual docx
... acknowledging that the application of
tools is difficult but useful for building rapport with clients and
making the client- provider interaction more effective.
Section II Trainer’s Guide
94
ACTIVITY ... care providers. The essence of the client centered approach is
designed to make health care providers more receptive to the need of
clients and responsive to clients’ situati...
Tài liệu Chapter 1:Introduction- Web Client Programming with Perl doc
... 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 that communicates with a web server, ... 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 w...
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