Web Client Programming with Perl-Chapter 4: The Socket Library- P1
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 host. The server then uses the listen( ) and ... on that port. On the other end, the client also uses the socket( ) system call to create a socket, and then the connect( ) call to initiate a connection associated with that socket on a specified...
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Tài liệu Web Client Programming with Perl-Chapter 3: Learning HTTP- P1 pdf
... protocol, in which the client makes a request, the server responds, and the transaction is then finished. The client initiates the transaction as follows: 1. First, the client contacts the server ... determines that the client used a POST method, processes the URL, executes the program associated with the URL, and pipes the client& apos;s entity-body to a program specified at the address of ... interfaced with a wider variety of server resources. In a POST request, the data sent to the server is in the entity-body of the client& apos;s request. After the server processes the POST request...
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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 $the_ url[3] HTTP/1.0\n"; ... match, the referenced URL is pushed into an array, which is returned at the end of the function. We've saved this in web. pl, and will include it in the hgrepurl program with a require &apos ;web. pl'....
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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. The MIME module converts to/from ... where the first parameter is the identifier that defines the value of the User-Agent header in the request, the second parameter is the email address of the person using the robot, and the optional...
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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::RobotUA object through the constructor. ... by the user with the port( ) method, the default port is always the same. $url->epath( ) When invoked with no parameters, this returns the escaped path of the URL defined in the object....
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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 line tells the server what the client ... The fourth line (Content-type) tells the browser the type of the document. In this case, it is HTML. 5. The fifth line tells the client how many bytes are in the entity body that follows the...
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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 tells the client about the configuration ... program, the output of which is sent to the client. Finally, the last entry on the first line specifies the version of HTTP the client is using. More about this in the next chapter. 2. General message...
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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 signifies that the client wishes ... stored for the server From Indicates the email address of the user executing the client Host Specifies the host and port number that the client connected to. This header is required for all clients...
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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 not at the destination ... $ua->request($request); They both do the same thing; they request a document from a user-specified web server and identify themselves in the User-Agent header. But one looks a lot cleaner than the other. Instead...
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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 ... local to the web server, in that order. The type( ) method returns an associate array of URLs, where the value of each URL hash contains the content-type for the URL. And finally, the ref( ... First, the initial URL is pushed onto a queue: push (@urls , $root_url); The URL is then checked with a HEAD method. If we can determine that the URL is not an HTML document, we can skip it. Otherwise,...
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