Web Client Programming with Perl-Chapter 4: The Socket Library- P2
Web Client Programming with Perl-Chapter 4: The Socket Library- P2
... Chapter 4: The Socket Library- P2 Now we wait for a response from the server. We read in the response and selectively echo it out, where we look at the $response, $header, and ... open_TCP('F', $the_ url[1], $the_ url[2])) { print "Error connecting to web server: $the_ url[1]\n"; exit(-1); } # request the path of the document to get print F "GET...
Tài liệu Web Client Programming with Perl-Chapter 3: Learning HTTP- P2 pdf
... image/jpeg
The proxy then examines the URL, contacts www.ora.com, forwards the
client& apos;s request, and then returns the response from the server to the original
client. When forwarding the request ...
on both the inside and outside of the firewall. Computers on the inside of a
firewall initiate requests with the proxy, and the proxy then communicates to
the...
Web Client Programming with Perl-Chapter 4: The Socket Library- P1
... 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 the time, but ... etc.). Initially, the server uses the socket( ) system call to create the socket, and the bind( ) call to assign the socket to a particular port on the ho...
Web Client Programming with Perl-Chapter 5: The LWP Library- P1
... 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, ... a client/ server negotiation.
The LWP module is the core of all web client programs. It allows the
client to communicate over the network with the server.
T...
Web Client Programming with Perl-Chapter 5: The LWP Library- P2
... invoked with no parameters, this returns the default port for the
URL defined in the object. The default port is based on the scheme
used. Even if the port for the URL is explicitly changed by the ... Since we're
programming a web robot, the name of the robot and the email address of
the user are mandatory. So, we pass that information to the LWP::RobotU...
Tài liệu Web Client Programming with Perl-Chapter 2: Demystifying the Browser-P1 pdf
... example, the browser
is given the following URL:
http://hypothetical.ora.com/
The browser interprets the URL as follows:
http://
In the first part of the URL, you told the browser to use HTTP, the ... In the third line, beginning with the string User-Agent, the client
identifies itself as Mozilla (Netscape) version 3.0, running on
Windows NT.
4. The fourth l...
Tài liệu Web Client Programming with Perl-Chapter 2: Demystifying the Browser-P2 doc
... server response
In the server response, the general header and entity headers are the same as
those used in the client request. The entity-body is like the one used in the
client request, except ... is using. The status code
indicates the result of the request, and the reason phrase is a human-readable
description of the status-code.
The response header t...
Web Client Programming with Perl-Chapter 3: Learning HTTP- P3
... 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 send the requested ... finishes. The close parameter signifies that either the client or server wishes to end the connection (i.e., this is the last transaction). The keep-alive parameter s...
Web Client Programming with Perl-Chapter 6: Example LWP Programs-P1
... let's center on another chunk of
code that changed from the sockets version of hgrepurl.
In Chapter 4, the raw sockets version checked the response code and then
skipped over the HTTP headers: ... > tags in the response.
4. If "Delivered To : " shows up in the reply (with or without text after
the colon), the query was successful but the document is no...
Web Client Programming with Perl-Chapter 6: Example LWP Programs-P2
... For the not _web( ), local( ), and remote( )
methods, a similar associative array is returned, where the URL is a key in
the array and denotes that the URL is not HTTP-based, is local to the web ... Programs -P2
Then the scan( ) method does all the real work. The scan( ) method accepts a
URL as a parameter. In a nutshell, here's what happens:
The scan( ) method...
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