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Web-Client Programming with PERL by Clinton Wong

By Clinton Wong

Utilizing this booklet, readers will find out how to expand scripting abilities to the net. The booklet teaches the fundamentals of the way browsers speak with servers and the way to write down personalized net consumers to automate universal initiatives. it's meant in the event you are inspired to enhance software program that gives a extra versatile and dynamic reaction than a typical net browser.

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The following is a complete listing of response codes implying a server error: Code Meaning 500 Internal Server Error This code indicates that a part of the server (for example, a CGI program) has crashed or encountered a configuration error. 501 Not Implemented This code indicates that the client requested an action that cannot be performed by the server. 502 Bad Gateway This code indicates that the server (or proxy) encountered invalid responses from another server (or proxy). 503 Service Unavailable This code means that the service is temporarily unavailable, but should be restored in the future.

The Connection header indicates whether the network connection will be maintained after the current transaction finishes. , this is the last transaction). The keep-alive parameter signifies that the client wishes to keep the connection open. 1, the default is to keep connections open until they are explicitly closed. 1; however, clients must be sure to include the following header in their last transaction: Connection: Close or the connection will remain open until the server times out. How long it takes the server to time out depends on the server's configuration ...

If this header is omitted, the server assumes that the client can accept any media type. The Accept header can have three general forms: Accept: */* Accept: type/* Accept: type/subtype Using the first form, */*, indicates that the client can accept an entity-body of any media type. The second form, type/*, communicates that an entity-body of a certain general class is acceptable. For example, a client may issue an Accept: image/* to accept images, where the type of image (GIF, JPEG, or whatever) is not important.

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