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</script> </head> <body> <button onclick="asynchronous.call('../chap04/chunked.ashx')"> Get Image</button> <table> <tr><td id="counter"></td></tr> </table> </body> </html> In the example HTML code, the button calls the method asynchronous.call, and the called URL is ../chap04/chunked.ashx. In a traditional development, this would be called a hardcoded URL reference. Programmers tend not to like hard-coded URLs because they make it difficult to update a website if the URL changes. In the example, the hard-coded URL may not be optimum. The preferred URL would be ../chap04/chunked as the preferred URL implements the separation of resource from representation. The point, though, is to reference the design practices of the Permutations pattern. Specifying a URL by Using User Identification Another approach to specifying a URL is to use the server-side framework to generate the URL dynamically. In the following example, some ASP.NET code is used to generate the URL dynamically:
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CHAPTER 8 PERSISTENT COMMUNICATIONS PATTERN
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<%@ Page Language="C#" %> <script runat="server"> class DynamicURL { public static string GetAsync() { return "/url"; } } </script> <html> <head> <title>Hard Code Reference</title> <script language="JavaScript" src="../lib/factory.js"></script> <script language="JavaScript" src="../lib/asynchronous.js"></script> <script language="JavaScript" type="text/javascript"> var asynchronous = new Asynchronous(); </script> </head> <body> <button onclick="asynchronous.call('<%=DynamicURL.GetAsync() %>')"> Get Image EBVN </button> <table> <tr><td id="counter"></td></tr> </table> </body> </html> In this modified example of the HTML code, there is code that is executed on the server side, and code that is executed on the client side. For those who code in PHP, JSP, or other similar technologies, you will know that what is executed on the server side is surrounded by escape tags. For ASP.NET, the escape tags usually are the <% and %> characters. Another way to run server-side code using ASP.NET is to use the script tag, where the runat attribute has a value of server. What is of interest is the text DynamicURL.GetAsync, which is a method call issued on the server to generate a URL. In the implementation of the GetAsync method, a hard-coded /url is returned, but the implementation really represents a piece of dynamically generated code. Generating the URL dynamically is not a real advantage because that is the purpose of the Permutations pattern. Where generating the URL does make sense is if the Content Chunking and Decoupled Navigation patterns are used. In those cases, there are scenarios where functionality is referenced that is orthogonal to the functionality of the HTML page contained in the URL. The orthogonal URL might be a dependency of some web application plug-in, and hence generating the URL gives some extra flexibility. In the case of the server push, the dynamically generated URL can be used to identify the specific URL.
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Specifying a URL by Using HTTP Redirection Looking at the preceding example, you can see that the class DynamicURL, when called, generates a single URL. As I have outlined, one use of the dynamically generated URL is to identify the unique server push URL. The URL is generated by using the early definition approach (the counterpart late definition approach will be illustrated shortly). The approach is called early definition because the unique URL is identified after the HTML content has been generated. Using such an approach is not always possible nor useful. Imagine the scenario where e-mails are sent to ask users to update details. Generating the unique URLs at the time of creating the URLs would be a security risk. A better approach is to let the user log in and then be redirected to the specific URL. The same can be said for the Persistent Communications pattern. The solution is to use HTTP redirection that generates the unique URL at the last possible moment. HTTP redirection uses a late-definition approach. Following is an example HTTP conversation that performs an HTTP redirection. As usual, a client makes an HTTP request: GET /resource/ HTTP/1.1 Accept: */* Accept-Language: en Accept-Encoding: gzip, deflate User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/412.6.2 (KHTML, like Gecko) Safari/412.2.2 Connection: keep-alive E B V N Host: 192.168.1.242:8100 The URL /resource is recognized by the HTTP server as a generic URL that when called will redirect to a specific URL. The HTTP server responds with an HTTP 302 to indicate a redirection, as illustrated by the following HTTP response: HTTP/1.1 302 Found Date: Mon, 05 Sep 2005 16:29:04 GMT Server: Apache/2.0.53 (Ubuntu) PHP/4.3.10-10ubuntu4 Location: /resource/joesmith Content-Length: 346 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/html; charset=iso-8859-1 In the example, the specific URL is defined as /resource/joesmith that is sent to the client. When either a web browser or XMLHttpRequest object receives a redirect, the client will recognize the redirect and attempt to retrieve the contents of the redirected URL, as illustrated by the following final request: GET /resource/joesmith HTTP/1.1 Accept: */* Accept-Language: en Accept-Encoding: gzip, deflate User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/412.6.2 (KHTML, like Gecko) Safari/412.2.2 Connection: keep-alive Host: 192.168.1.242:8100
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