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CHAPTER 5 5-1. IMPLEMENTING A UNIVERSAL WEB SERVICE ARCHITECTURE
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XPath on the XML database, you can easily execute sophisticated queries without having to write the plumbing. You need to remember that the power of a historical Web service lies in how you implement the queries. What Format of Data to Send Thus far, all of the example Web services have been explained in terms of URLs, but not in terms of the content that is accepted and generated. In the case of the blogging application introduced in 4, the Web service generated Atom data using the MIME type application/atom+xml. When building REST Web services, the MIME type is important, because it determines how the data is received and sent. In the case of the blogging application, if the Atom URL is called, it will generate an XML stream. In theory, the REST development strategy is to create a Web service that is technologyneutral and will generate the right content for the right query. Identifying the Resource and Representation REST promotes the separation of the resource from the representation. For illustration purposes, let s work through the historical stock-ticker example. The URL used to retrieve the historical ticker information is /services/historical/AMZN/2006. The default format generated by the Web service is CSV, but the default could just as easily have been XML or JavaScript Object Notation (JSON). If a client can only accept JSON, then the conversion from CSV to JSON requires an extra step and extra resources. To optimize this application, you can let the server decide which content to generate based on the needs of the client. If the client wants JSON, then the server will generate JSON. The data that is generated as JSON, XML, and CSV is all the same. Thus, it can be said that the data is the resource, and JSON, XML, and CSV are the representation. 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 doesn t need to be the only one. Let s focus on the Accept HTTP header and consider the following HTTP conversation that returns some content. Request GET /services/historical/AMZN/2006 HTTP/1.1 Host: 192.168.1.242:8100 User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; 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: Mon, 21 Aug 2006 14:51:40 GMT
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CHAPTER 5 5-1. IMPLEMENTING A UNIVERSAL WEB SERVICE ARCHITECTURE
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Server: Apache/2.0.53 (Ubuntu) Last-Modified: Thurs, 11 May 2006 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 when the request provides the HTTP headers Accept, Accept-Language, Accept-Encoding, and Accept-Charset. These HTTP headers are accepted by the HTTP server and serve as an indication of what content to send. Focusing on the HTTP header Accept, the values are a series of MIME-encoded identifiers that the client will accept. 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 content available with the priority defined by the client that, for example, forces the server to send HTML content before plain-text content. The priority of content is the priority of the MIME types as defined in the HTTP specification. The following list is generated when you reorder the example request: 1. 2. 3. 4. 5. 6. 7. application/xhtml+xml text/xml application/xml image/png text/html;q=0.9 text/plain;q=0.8 */*;q=0.5
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The ordering of the identifiers depends on the identifier specialization and its q value. A MIME type identifier that has no q value indicates a default value of 1.0. When a q value exists, you must lower the priority of the MIME type identifier to the value specified by the q value. Identifier specialization is when one identifier is a higher priority because the specified content 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. Note that the first MIME identifier from the HTTP conversation is text/xml, and the second is application/xml. Yet, in the priority order, the first MIME identifier is application/xhtml+xml. I made this assumption after having read the HTTP and MIME specifications, but I feel it s a bug that just happened to work. Let s dissect the example request to understand why this bug happened to work. 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 server follows the ordering of the MIME types, it means that the browser prefers receiving XML content to HTML or XHTML content. The application/xml and text/xml MIME types are XML content, albeit the XML content could be XHTML content. Reading the specification solves the problem with the phrase regarding the priority ordering of the MIME types, which generically says 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.
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