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CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
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be to encode the variable and make it part of the URL, like the following: http://mydomain.com/ search query=Ajax+Applications. The URL is encoded by using Common Gateway Interface (CGI) encoding. The text after the question mark is the CGI query string, but to avoid confusion, it will be called the query string. Contained within the query string are a number of variables and their associated values. For this chapter, let s call the individual variables URL request variables for lack of a better term. The URL request variables are encoded by using the CGI interface. Another approach is to do what many other patterns of this book have been doing and that is to send and receive data using XML. Yet another approach to rewrite the URL would be to reference the URL without a query string, as illustrated by the following: http://mydomain.com/search/query/ Ajax+Applications. This approach would be better and would be more compliant to what other patterns in this book have discussed and even harped on. The supposedly correct URL would work, but it is unsettling because the data referenced by the URL is not a constant per se. For example, imagine switching around the query text to Applications+Ajax. Would that not result in the same result set Yet they are two different URLs. What about Apps+Ajax The combinations and permutations are large and would require too many unique URLs. It is not that the supposedly correct URL is unusable in general; it is unusable for the search example. For example, in the case of Map.search.ch, the URL to my previous home was http://map.search.ch/8143-Stallikon/3-Muelistrasse. In that case, it was good to convert the query string into a resource because it is a steady resource that is not likely to change too quickly (barring some natural disaster, but then you would have bigger problems than figuring out whether your URL is well designed). The rule of thumb for knowing when to use a query string and when to use a complete URL EBVN depends on the nature of the data referenced by the resource. If the resource represents a mailbox(es), invoice(s), address(es), model part(s), or something that can be described by a noun, it is a completely defined resource. If the represented data is an action on the noun, you should use a query string. This means you could search for addresses or could filter invoices. The difference between a query string and a complete URL is minimal in some cases, and some individuals prefer a query string to a URL. One big reason to use URLs and not query strings has to do with Internet infrastructure. Consider the URL http://mydomain.com/ 8143-Stallikon/3-Muelistrasse and its equivalent as a query string, http://mydomain.com/ zip=8143&city=Stallikon&street=3+Muelistrasse. In the case of the query string, the URL without the query string is http://mydomain.com. Because the same URL is called, the Internet infrastructure cannot use HTTP validation because the variation of the URL is the query string. If a large amount of data is downloaded, potentially a resource drain will have been created. The better option would have been to use a unique URL that can be validated or cached. Having written all that, some servers will cache data based on the query string. However, doing that can be very dangerous from a caching perspective. The reason has to do with the fact that a query string is intended for HTML forms, or is considered a processing directive. If you are unsure and want to be correct, use a unique URL.
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Defining the Calling Interface
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So now we ve defined the resource, or URL, and the query string used by the client to call the controller. What has not been defined are which HTTP verbs are used and how to call those HTTP verbs. In terms of patterns in this book, the HTTP verbs can be called by using either
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