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CHAPTER 5 PERMUTATIONS PATTERN
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in a time-dependent fashion (for example, http://mydomain.com/news/column/jack/current for current news and http://mydomain.com/news/column/jack/2005-10-10 for an archived news item) You must remember that the URL represents a resource that the HTTP server is responsible for converting into a representation. The client is not responsible for knowing what technologies or files are stored on the server side, because that is a complete dependency of the HTTP server.
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Identifying the Resource and Representation
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Taking a closer look at the URL http://mydomain.com/books/[ISBN], let s work through how it would be implemented. The URL refers to a specific book with the identified ISBN number. When the URL is sent to an HTTP server, a response is generated. The problem is determining which content the server should send to the client. Separating the resource from the representation means that a single URL will have separate representations. The representation that is sent depends on the value of the HTTP Accept-* header, but that header need not be the only one. As was just mentioned, the user using a query variable could specify the representation. More about other HTTP headers will be discussed shortly. For now, let s focus on the Accept HTTP header and consider the following HTTP conversation that returns some content. Request: GET /books/3791330942 HTTP/1.1 Host: 192.168.1.242:8100 User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; EBVN en-US; rv:1.7.8) Gecko/20050511 Accept: text/xml,application/xml,application/xhtml+xml, text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Response: HTTP/1.1 200 OK Date: Sun, 21 Aug 2005 14:51:40 GMT Server: Apache/2.0.53 (Ubuntu) PHP/4.3.10-10ubuntu4 Last-Modified: Wed, 11 May 2005 17:43:45 GMT ETag: "41419c-45-438fd340" Accept-Ranges: bytes Content-Length: 69 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/html; charset=UTF-8 The request is an HTTP GET, which means the HTTP server needs to retrieve the data associated with the resource. The operation becomes specific due to the request-provided HTTP headers Accept, Accept-Language, Accept-Encoding, and AcceptCharset. These HTTP headers are accepted by the HTTP server and indicate what content to send.
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CHAPTER 5 PERMUTATIONS PATTERN
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Focusing on the HTTP header Accept, you can see that the values are a series of MIMEencoded identifiers that the client can accept and process. The order and type of the identifier are important because they specify the priority of the content that the client wants to receive from the server. The logic is to send the best content available that has the best priority defined by the client. This, for example, forces the server to send HTML content before plain text content. As per the HTTP specification, the priority of the example request-provided MIME types is as follows: 1. application/xhtml+xml 2. text/xml 3. application/xml 4. image/png 5. text/html;q=0.9 6. text/plain;q=0.8 7. */*;q=0.5 The ordering of the identifiers depends on the identifier specialization and its q value. When a MIME-type identifier has no q value, it means a default value of 1.0. When there is a q value, it means to lower the priority of the MIME-type identifier to the value specified by the q value. EBVN Identifier specialization occurs when one identifier is a higher priority because the content specified is more specific than the other identifier. In the list of priorities, the identifier text/ xml is more specific than */* because */* means everything. Additionally, text/xml is more specific than text/*, and hence text/xml is a higher priority. What you should notice is that the first MIME identifier from the HTTP conversation is text/xml, and the second is application/xml. Yet in the priority ordering, the first MIME identifier is application/xhtml-xml. This is an assumption I made after having read the HTTP and MIME specifications,2 but I feel it s a bug that happens to be correct. To understand why this bug happens to be correct, the example request needs to be dissected. The MIME-type identifiers application/xml, text/xml, and application/xhtml-xml are considered specific, and each has a q value of 1. If the order of the MIME types as issued by the browser is followed, it means that the browser prefers receiving XML content to HTML or XHTML content. From the specifications, application/xml and text/xml MIME types contain XML content, although the XML content could be XHTML content. Reading the specification solves the problem because it indicates that a more specific MIME type is ordered before a less specific MIME type. This means application/xhtml-xml is ordered before application/xml and text/xml because application/xhtml-xml is specifically formatted XML. Having solved this bug (which could be considered an interesting feature) and having sent the proper representation, figuring out what to send with respect to the Accept HTTP header does not get any better. Following is another HTTP request that asks for some content.
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2. http://www.w3.org/TR/xhtml-media-types/
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