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eb programming is one of the best ways for a language to gain visibility. Ever since the web gained widespread popularity, developing for web targets has been important for a wide variety of programmers. Web front ends have provided many developers an easy way to allow for multiplatform access. In today s world of mobile devices, an application must be web-accessible. In many ways, OCaml is an excellent programming language for web programming. Because nearly every platform has a web browser (even many cell phones), it makes sense to target the web as a platform when designing applications (this is easier said than done.) How do you handle state What about security This chapter will give you some of these answers.

class StocksListHandler < Mongrel::HttpHandler def initialize(stocks_list) @stocks_list = stocks_list super() end def process(request, response) response.start(200) do |headers, output_stream| headers["Content-Type"] = "text/plain" output_stream.write(@stocks_list.to_xml) end end end

Before you overrun your site with Ajax, we should discuss some tips and mistakes that you might want to bear in mind as you are designing pages. This is not meant to be a patternsand-practices conversation, but rather an examination of some common concepts that seem to pop up across the web.

s Note Most of the code shown here works only on Unix and Unix-like platforms. Specifically, the thirdparty Common Gateway Interface (CGI) and FastCGI libraries are for Unix only. The Apache-specific items probably work on Windows, but for the most part this chapter should be considered to be for Unix only.

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The StocksListHandler class inherits from Mongrel::HttpHandler, so you need to define only two methods. The rest of the functionality relating to the web server is handled by Mongrel. The first, initialize, is a constructor used to set your @stocks_list instance variable. Note the call to super, which calls the Mongrel::HttpHandler s initialize method so that it can do any Mongrel-specific initialization. The call to super has empty parentheses after it. In this case, because no arguments are specified, super calls the overridden constructor with the original arguments. Because Mongrel::HttpHandler s

The focus on security and safety makes OCaml an excellent choice for web programming. There are also a few existing libraries that help take some of the tediousness out of writing web code (especially processes such as parsing query strings and cookie management).

You should use Ajax controls where it makes sense to I ve come across a few sites where the developers absolutely Ajaxed the thing to death Just because you can do something does not always mean that you should When you choose to implement dynamic content on the site, it is imperative that the interactive portion of the site is obvious and easy to use How many times have you been to a site and the first thought in your mind is, Ummm what do I do here Nothing will turn an anonymous user away from a site faster than confusion When you use an Ajax control that is primarily responsible for the direct modification of other content on the same page, you ll want to locate the two entities in close proximity to each other.

constructor takes no arguments, it will raise an error if you do not explicitly indicate to super that you do not wish to pass your arguments to Mongrel::HttpHandler s constructor. The second method defined in StocksListHandler is process, which handles a request from a web browser or other HTTP client, such as the stock ticker you will create next (Listing 9-2). You use Mongrel s response method to respond with a 200 status code, which means success. You could return other error codes if necessary, of course, such as 404 if a file isn t found or 501 if an internal server error occurs. Next, you set the Content-Type header, which specifies the type of content you re sending, to text/xml. If your page is viewed with a web browser, this will affect how the page is displayed. Finally, it calls the to_xml method of your StocksList instance to render your list of stocks as XML, and then writes that to the output stream, which, in turn, sends it to the client requesting the information.

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