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As we talk about routing, we are actually talking about both routing and referral. The term routing refers to the infrastructure that enables SOAP messages to be forwarded on to other destination endpoints. The term referral describes the physical act of forwarding a message on. It is common practice to use the term routing to describe the combined process of routing and referral.

Step 4: Retrieve the security context token from the provider. The IssueSecurityContextTokenAuthenticated method will return a valid SecurityContextToken object if the call is successful. You are now ready to make secured Web service requests using this security context token. Step 5: Add security elements to sign and encrypt upcoming Web service requests using the new security context token. The security context token is no different from other security tokens that you worked with in 6, including the UsernameToken and X509SecurityToken classes. You add the security context token to the SOAP request message header, just as you would any other security token. If you need to make multiple service requests over an extended period of time, then you may wish to add the security context token to a global cache for future retrieval. You will also then need to store the token ID for future reference because it is possible that the global cache will contain other security tokens, and you will need a way to retrieve the correct token from the cache. Step 6: Proceed to call the Web service methods as usual. After all this work, nothing much changes. The Web service methods are called as usual, and the only difference is that the requests and responses are being secured with the security context token for the duration of the session.

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Here are a few examples of subject lines and the actions they would cause to be performed: Subject: getthisfile help: Sends getthisfile usage information back to the sender. Subject: getthisfile /etc/resolv.conf: Mails the /etc/resolv.conf file back to the sender. Subject: getthisfile command ls -l /tmp: Sends the output of ls -l /tmp back to the sender. Subject: getthisfile binary /usr/bin/diff: uuencodes the binary file /usr/bin/diff and mails the text back to the sender for later decoding. uuencode is a utility that encodes a binary file (executable, data, etc.) into simple ASCII. This way the file can be easily sent through e-mail and decoded on the receiving side.

wo of the fundamental types of operations in any programming language are the comparison and the test. They are the building blocks of conditional statements (if/ then and case) and iteration statements (while). They give you the ability to examine relationships between data items, such as files, variables, strings, and numeric values, and to take action based on the result. You can also carry out actions based on the attributes of a particular item, such as a file s type, whether a variable has been assigned a value, and the return code of a command. The examples in this chapter illustrate various ways to compare items or to check their properties, and use the results. I have used all of these techniques throughout this book, although some are used more frequently than others. Here I want to present a diverse set of examples that demonstrate the many uses of the test shell programming structure.

I will now review the detailed steps for building the Web service and the client in a secure conversation solution. This section follows the outlines of the previous sections on how to implement the Web service and the client.

Remember that all Web service specifications are composable Routing does not implement any kind of security for referred messages However, you can use WS-Security in conjunction with routing to provide a security solution for the referred messages For example, you can digitally sign or encrypt incoming messages, as you saw in the SOAPSender solution Note that encrypted messages can pass through intermediary routers even if those routers do not know how to decrypt the message Routing configuration is separate from the message contents The intermediary only needs to decrypt the message if this is required in order to make a specialized routing decision But in most cases this will not be necessary If the routers do need to decrypt the message and you use X509 certificates for encryption, you must ensure that each of the intermediary services has access to the necessary keys.

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