Web Client Programming with Perl-Chapter 3: Learning HTTP- P3
Web Client Programming with Perl-Chapter 3: Learning HTTP- P3
... Chapter 3: Learning HTTP- P3 HTTP Headers Now we're ready for the meat of HTTP: the headers that clients and servers can use to exchange information ... web client requests the document without sending an Authorization header. If the server denies access to the document, the server specifies the authorization method for the client to use with ... If-Modified-Since, et al. To accommodate client- side caching of documents, the client can use the If-Modified-Since header with the GET method. When using this option, the client requests the server to...
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Tài liệu Web Client Programming with Perl-Chapter 3: Learning HTTP- P1 pdf
... from URL-encoded format to retrieve the values entered by the user. File uploads with POST Chapter 3: Learning HTTP- P1 In the previous chapter, we went through a few examples of HTTP transactions ... 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 ... practice, POST is used with CGI programs that happen to interface with other resources like network services and command line programs. In the future, POST may be directly interfaced with a wider variety...
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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 header field. Client ... back to the client. When the TRACE method is used with the Max-Forwards and Via headers, a client can determine the chain of intermediate proxy servers between the original client and web server....
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Web Client Programming with Perl-Chapter 4: The Socket Library- P1
... not fully compliant with the HTTP specs, the web server won't understand you! Perhaps your web client works with one web server but not another. Or maybe your web client works most of ... character is '^'. Tue Jun 14 00: 03:1 2 1996 Connection closed by foreign host. Your First Web Client Let's modify the previous code to work with a web server instead of the daytime ... accept( ) will associate with a specific network connection. accept(FH,F) || die $!; So when a client connects to the server, accept( ) associates the client& apos;s connection with the file handle...
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Web Client Programming with Perl-Chapter 4: The Socket Library- P2
... your client. In the event of a redirection, will your client handle it? Does it examine the Location header? The answers to these questions depend on the purpose of the client. Does the client ... Socket; # include Socket module require 'tcp.pl'; # file with Open_TCP routine require &apos ;web. pl'; # file with parseURL routine use vars qw($opt_h $opt_i $opt_l); use Getopt::Std; ... Socket; # include Socket module require 'tcp.pl'; # file with Open_TCP routine require &apos ;web. pl'; # file with parseURL routine use vars qw($opt_h $opt_H $opt_r $opt_d);...
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Web Client Programming with Perl-Chapter 5: The LWP Library- P1
... that are useful for client programming. The LWP Module The LWP module, in the context of web clients, performs client requests over the network. There are 10 classes in all within the LWP module, ... module describes client requests, server responses, and dates, and computes a client/ server negotiation. The LWP module is the core of all web client programs. It allows the client to communicate ... between web clients and servers. Now we'll fill in the rest of the puzzle: how your program establishes and manages the connection required for speaking HTTP. In writing web clients...
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Web Client Programming with Perl-Chapter 5: The LWP Library- P2
... In the context of web client programming, you'll usually get an HTTP::Response object from LWP::UserAgent and LWP::RobotUA. If you plan to write extensions to LWP or a web server or proxy ... object. LWP::RobotUA's constructor is a little different, though. Since we're programming a web robot, the name of the robot and the email address of the user are mandatory. So, we ... since January 1, 1970, UTC. HTTP::Headers This module deals with HTTP header definition and manipulation. You can use these methods within HTTP::Request and HTTP::Response. $h = new HTTP::Headers([$field...
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Web Client Programming with Perl-Chapter 6: Example LWP Programs-P1
... programs with more user-friendly options and features. We present three broad categories of web client programs: Simple clients programs that perform actions for users in real time, usually with ... in Chapter 4, The Socket Library. Periodic clients robots that perform a request repeatedly, with some delay between each request. Periodic clients typically request the same resource over ... categories are not set in stone. It is possible to write a periodic client that also happens to be a recursive client. Or a simple client might become periodic if the document indicates that the...
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Web Client Programming with Perl-Chapter 6: Example LWP Programs-P2
... references if ($print_not _web) { my %notweb = $site->not _web; print "\nReferenced non-HTTP links:\n"; foreach $url (keys %notweb) { print "notweb: $url\n"; } } ... not http based sub not _web { my $self = shift; %{ $self->{'not _web& apos;} }; } # return associative array of encountered urls that are local to the # web server that was queried ... (URLs that have been visited) # %notweb $notweb{$URL}=1 if URL is non-HTTP # %badlist $badlist{$URL}="reason" (URLs that failed. Separated with \n) getopts('avlrRnbhm:p:e:d:');...
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Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P1
... program that will just prompt for the word and go look it up without all that extra hassle. Anyone familiar with the xwebster client for the X Window System will find xword to be vaguely familiar, ... 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 version ... place. We want lots of room to type, so we set it up with a default width of 40. Also note that we are storing anything that's been entered with the Entry widget in a global variable called...
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