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imposed by URL escaping. This is compounded if the client is using a proxy, which adds the proxy s URL details to the client s originating URL. Conversely, because GET-driven scripts gather input data from the request URL, it s possible for a user to bookmark the resultant page in a Web browser. This can be incredibly useful, for example, in bookmarking the results of a particular set of criteria passed to a search engine; the user only has to recall the URL to regenerate the search on fresh data. The data submitted via a POST request isn t generally retained by the browser and is in fact explicitly forbidden if the server has sent cache control headers denying its reuse. If a client bookmarks the result so it can return later, the data wouldn t be resubmitted. Worse, the URL would be called up via a GET request, which may not even be a valid form of access. A well-designed CGI script that doesn t need to allow for large quantities of input should therefore keep the URL as short as possible and use GET so users can bookmark the result, unless of course, you want to actually prevent clients from being able to do this. In that case, POST is your man. There s no reason why a CGI script shouldn t be able to handle both GET and POST requests. This makes it less prone to malfunction if it receives parameters different from those it expects and also makes it more resilient because you can change how it s called. Smart programmers will use a CGI library, such as CGI.pm for Perl, and have the whole problem dealt with for them.

The GET and POST requests to drive a CGI script are generated by the client, usually a browser program. Although a GET request can be generated in response to clicking a link (note that it s perfectly legal to say <a href="http://host/path query">...</a> in HTML), a POST request has to be generated by an HTML form. The following HTML fragment defines a form that would generate the GET request shown previously:

<form method=GET action="/cgi-bin/askname.cgi"> <p>Please enter your name:</p> <p>First Name: <input name="firstname" type=text></p> <p>Surname: <input name="surname" type=text></p> <p><input name="OK" type=submit></p> </form>

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This chapter started by explaining the need for and importance of XML parsing. Because XML documents are manipulated electronically, we need to parse them electronically. You learned about several parsing techniques supported by Apache and considered several practical situations in which XML parsing techniques are applied. The chapter covered three main techniques of parsing XML documents: SAX, DOM, and XMLBeans. For each technique, the processing model was explained. We considered the pros and cons of each technique. The chapter discussed several programming examples to illustrate the processing models. Finally, the chapter covered the merits and demerits of each technique, comparing and contrasting their use in practical applications. You will now move on to study an important and very wide use of XML in today s applications. XML is the foundation for data transport in web services architecture, which you will learn about in the next chapter. Subsequent chapters will cover the in-depth use of XML in this new and widely accepted architecture.

If you wanted to generate the equivalent POST request, you d only have to change method=GET to method=POST in the FORM element. To actually process the request that s generated by the client submitting this form, you now need to write a short CGI script. The following Perl script does the job using CGI.pm (a standard Perl module) to process the script and extract the parameters from it:

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