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Originally, the REST application used a set of URLs, but the URLs were wrong because they fitted an API approach on top of a resource approach. For example, the memory URL is /services/memory/1. The URL looks correct, but is in fact completely incorrect. As the URL is defined, the memory location /services/memory/1 is shared by everybody. To distinguish between the different users, most Web application frameworks use cookies. And cookies, again, are the completely wrong answer. Imagine writing an application where you save some value that you want to share with somebody else. If you give to the other person the URL that you used to store the data, that person could not access the data because his cookie identifier would not be compatible with your cookie identifier. The problem is that the state of the resource as defined by the URL is dependent on the URL and a cookie identifier. This violates REST principles. REST principles state that if memory is stored at the URL /services/memory/1, then the same state is retrieved regardless of who accesses the URL. A cookie can be used for authorization purposes. Using a cookie, a server can identify whether a request is authorized to view the representation of the resource. The solution is to think in data terms and consider the memory location identifier as an arbitrary row identifier that references a memory location. This results in the addition being both a calculation and a memory operation. You can extend the solution of assigning an arbitrary value to the addition operation, as illustrated in Figure 1-7.

A more secure approach incorporates SSL to encrypt all information sent between the browser and SharePoint. So even if data is intercepted during transmission, it is indecipherable by an unauthorized third party. The details of how this works are beyond the scope of this book. But the essence is that you obtain two strings of random text, known as keys or certificates one public that you share with authorized users, and one private that only your server has access to. Because both keys (or derivatives of those keys) are required to decipher a message, only authorized users and SharePoint can read the data sent between them. A third party such as VeriSign, referred to as a certificate authority (CA), certifies that the provider of the certificate (your SharePoint server) is valid (see Figure 1-3). This prevents another party from maliciously impersonating your server as a way of capturing confidential data.

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Note If you look closely at the startup sequence, you ll notice that the registered class is not directly

bound to the channel. In fact, you d be right in thinking that all available channels can be used to access all registered objects.

Figure 1-7 shows only a single handler, which processes the calculator operations. Unlike Figure 1-5, an infinite number of URLs can be used to add two numbers. The numeric identifier is an arbitrary value used to reference a past calculation. Thus, a memory operation is not necessary because to reference a past calculation, you only need to reference the URL. If a calculation is to be shared among multiple users, then it is only necessary to bookmark the URL. When writing your own REST application, remember the following points: REST is about managing data, and SOAP is about managing APIs. REST has dynamic contracts that is, the resources are connected and described using links and the HTTP headers of the client. For example, one client can define the contract to be XML data, and another can define the contract to be HTML data. The server adapts to each by sending an appropriate representation for a resource. REST has a set of predefined semantics using HTTP GET, HTTP POST, URLs, resources, and representations. SOAP doesn t have a predefined set of semantics or contracts, as they re defined by the metadata (WSDL). REST manages URLs in a dynamic manner, where URLs are created dynamically. URLs in a REST approach represent references to a resource and not necessarily a file on a hard disk.

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