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Unlike REST, which exposes a strictly limited set of methods, an XML-RPC implementation is extensible, so it can create and use any method it may need in order to enable its API. For example, a weblog application might implement an addEntry() method, which would expect a request containing, among other things, the ID of the weblog and the title and content of the entry to be added. An example of an XML-RPC request and response can be found in Wikipedia at http://en.wikipedia.org/wiki/XML-RPC. SOAP: The SOAP API provides a way for distributed applications to pass objects and procedure calls to each other over HTTP. Like XML-RPC (from which it developed), SOAP uses an XML document to send a message, but in this case the document has a somewhat more complex structure, consisting of an envelope that contains a header and a body. The envelope encodes information about the sender and recipient of the message. SOAP was originally an acronym for Simple Object Access Protocol, by which name it is still sometimes formally known. See http://www.w3.org/TR/soap/ for the SOAP specification. Within the envelope, the header and body are application dependent (and the header is optional). SOAP header blocks are like the headers in an email message or HTTP request, in that they contain information related to the request. The body contains the information to be acted upon by the request. An example of a SOAP message can be found in Wikipedia at http://en.wikipedia.org/wiki/SOAP.

t is commonly required for all the pages in a given application to have a common layout. In this chapter, you ll learn how to apply a common layout to all your pages in your appli cation easily.

In all the pages of your application, you can then retrieve that information with something like this: UserPrefs preferences = (UserPrefs)session.getAttribute("upref"); By doing so, you don t need to access a user database in each JSP page until the user closes his browser or the session expires after a long period of inactivity.

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We begin discussing RPC security from the point of view of the server providing the web services. When offering a public web services interface to your users, you need to take all of the precautions you would for any other production website. But because web services are meant to be used by automated processes rather than individual, interactive users, you should take extra steps to prevent abuse of the system by poorly coded or abusive clients. And you certainly want to ensure that the request and the response are communicated safely and reliably. In the rest of this section of this chapter, we ll suggest ways you can add those extra steps of protection. But ultimately, providing a secure web service is no more (and no less) of a challenge than providing a secure website.

Suppose that you d like to develop an application like the one shown in Figure 6 1. It is not important what the application shown does. What is important is that on each page there is the same menu on the left.

The standard directives are executed when the JSP page is translated into Java. Their syntax is as follows: <%@ directive-name attr1="value1" [attr2="value2"...] %> where directive-name can be page, include, or taglib.

As a practical matter, your RPC interface (that is, your API, which exposes to a user, whether live or more likely automated, the functions your service has available) should be as simple and at the same time as restrictive as possible. Simple interfaces, with few options, are easy to test and audit. Limiting the things that scripted processes can do on your server limits the opportunity for them to attempt to do something undesirable. Another benefit of simplicity and limitation is that they make it much easier for you to check whether the submitted request is properly formed (we discussed the issue of checking user input at length in 2). You should reject any request that isn t perfectly constructed, on the grounds that it may be trying to pass an exploit or other undesirable information to the server. A good example of a simple interface is that provided by Creative Commons, the nonprofit provider of content licenses specifically designed for open source-style creative work (see http://creativecommons.org for more information). The Creative Commons API is described at http://api.creativecommons.org/readme_15.html, and offers various options, the most salient of which are:

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