All About the URI in Visual Studio .NET

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All About the URI
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Table 131 URI Examples URI Description
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http:// nanceyahoocom/d/ quotes s=MSFT&f=spt1d http:// nancegooglecom/ nance/ info q=MSFT http://enwikipediaorg/wiki/Apple wwwweathercom/weather/local/02451
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Microsoft (MSFT) stock quotes in comma-separated (CSV) format from Yahoo! Microsoft (MSFT) stock quote in custom JSON format from Google A Wikipedia Web page about Apples Weather information for Waltham, MA from Weathercom News article on MSNcom Wall Street corporate events listing services (for example, stock splits, mergers, and so on) in JSON format Slashdot syndication feed in RSS format Flickr photo search in custom XML format
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wwwmsnbcmsncom/id/20265063/ http://pipesyahoocom/pipes/piperun _ id=jlM12Ljj2xGAdeUR1vC6Jw&_ render=json&merger=eg http://rssslashdotorg/Slashdot/slashdot http://api ickrcom/services/rest/ method= ickrphotossearch&api_key= 20701ea0647b482bcb124b1c80db976f&text= stocks
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Each of the examples speci es a URI that takes a set of parameters that identi es a resource to retrieve Parameters are sent either as query strings or embedded as a part of the path of the URI This means that the URI is used to identify, locate, and access resources To better understand what we mean, we look at the URL used to retrieve stock quotes from Google It is obvious from the following URL that the parameter represents the stock symbol and is passed into the service as a query string parameter
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What is not represented is whether this URL is accessed using an HTTP GET or some other HTTP action For now, we will assume that GET is being
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13: Programmable Web
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used The URL can be rewritten with a parameter for the stock symbol in place of the MSFT stock symbol Using this simpli cation of the URL, we can identify a number of resources
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This example helps form the basis for how we can identify and access resources on the Web
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The Ubiquitous GET One thing in common with all the URIs in Table 131 is that they use the HTTP protocol to access resources The HTTP protocol is considered the protocol of the Web The original purpose of HTTP was to exchange HTML pages, but it has since been used to access all types of resources, including images, video, applications, and much more The way in which it does this is by specifying a resource identi er and an action to be performed on that resource URIs identify the resource The action is de ned by a set of HTTP verbs that specify the action to be performed on the resource Table 132 shows a list of common HTTP verbs used on the Web today There are many ways to interact with resources over the Web using the HTTP protocol, but none is as ubiquitous as GET GET is by far the most widely used verb POST comes in second, followed by other verbs such as PUT and DELETE
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Table 132 Common HTTP Verbs Verb Description
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GET POST PUT DELETE HEAD
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Retrieve the resource identi ed by the URI Send a resource to the server based on the resource identi ed by the URI Store a resource based on the resource identi ed by the URI Delete a resource based on the resource identi ed by the URI Identical to GET except that the response is not returned This is used to retrieve metadata for the resource identi ed by the URI
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All About the URI
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HTTP verbs form the basis for how we can interact with resources on the Web GET is the most widely used HTTP verb because it is used to retrieve resources HTTP verbs help to provide a uniform interface for interacting with resources, which is a constraint based on the REST architectural style
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Format Matters The list of URIs in Table 131 demonstrates the vast number of formats available on the Web today The content returned from these URIs includes HTML, XML, JSON, RSS, CSV, and custom formats This means that developers have not found a single format that can represent all resources on the Web For a while, it seemed that all roads would lead to XML as the single format XML is a great mechanism for providing structure to data and for sharing information For example, SOAP is a protocol for exchanging XMLbased messages and is the foundation for traditional Web services WCF provides support for the SOAP protocol SOAP does more than provide structure to data, though SOAP adds header information, which allows for advanced capabilities such as transport independence, message-level security, and transactions Web developers are not necessarily concerned about such capabilities and need a way to exchange information In these situations, formats such as Plain-Old-XML (POX) and JavaScript Object Notation (JSON) are often used POX is usually about developers not needing the capabilities that WS-* has to offer and not wanting the perceived overhead of SOAP In these situations, using POX is a good enough format for their needs JSON, on the other hand, is an ef cient format for returning data to browser clients that leverage JavaScript JSON as a format is more ef cient than SOAP and can offer signi cant performance and scalability bene ts when you are trying to reduce the number of bytes on the wires What this comes down to is that format matters, and developers need to be able to work with a number of formats when using the Web Web Programming with WCF Table 133 highlights some of the major features available to developers when they use WCF and NET Framework 35 The remainder of this chapter focuses on the features within WCF that help enable the programmable Web
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