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CHAPTER 8 SOAP MESSAGES: ADDRESSING, MESSAGING, AND ROUTING
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Routing and Security
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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 X.509 certificates for encryption, you must ensure that each of the intermediary services has access to the necessary keys. In fact, this applies whenever you use an X.509 certificate, whether for digital signatures or encryption. In a chain routing model, it is likely that intermediary services will modify the contents of an incoming SOAP request message. If the incoming SOAP message is digitally signed, the intermediary service will need to re-sign the message before forwarding it on to the next service. However, as the SOAPSender solution shows you, digital signature validation will not fail if the SOAP router simply passes on the SOAP message to a destination endpoint without altering the message contents. There is no question that routing solutions add an administrative and development burden to implementing an SOA. And when you add security policies into the mix, the burden will become even greater. It is likely that future releases of WSE will include provisions to address this issue. To this date, subsequent releases of WSE have always managed to reduce complexity compared to earlier releases of the same features.
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Routing vs. WS-Addressing
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Our first thought when we saw the WSE 3.0 WS-Addressing implementation was whether it overlaps with the pre-WSE 3.0 releases for routing and WS-Referral. There is no definitive answer to this question, but it seems very likely that the WS-Addressing specification does indeed supersede the WS-Routing and WS-Referral specifications for all SOAP routing models other than perhaps the load balancing model (which is not used often in Web services solutions due to the complexities that load balancing introduces for these types of solutions). The reason is that WSE 3.0 currently implements routing for the HTTP transport protocol only. This model requires the service endpoints to be .asmx service files or custom SOAP handlers. Either way, you need to configure a virtual directory to host the service. This can be a significant administrative burden if your virtual network infrastructure includes multiple chained services. By comparison, the WS-Addressing specification is implemented for nonHTTP protocols, such as TCP which do not require you to configure a virtual directory. , Perhaps the clearest indication for potential overlap between routing and WS-Addressing is the fact that WSE 3.0 continues to implement routing only for the HTTP transport protocol. We believe this was a purposeful decision to avoid implementing overlapping specifications that accomplish the same thing. In this scenario, one specification will always be more efficient than the other.
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CHAPTER 8 SOAP MESSAGES: ADDRESSING, MESSAGING, AND ROUTING
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Note WSE 3.0 supports routing only for HTTP due to a technical issue with the request/response model
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and TCP. With the TCP protocol, the intermediary does not know whether to hold a thread open to wait for a response. With HTTP, the intermediary either receives a response or receives an HTTP 202 error. TCPcompliant intermediaries must be custom written.
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You can further enhance your productivity with WS-Addressing by using classes called SoapClient and SoapService, which are higher-level classes than their counterparts SoapSender and SoapReceiver. The SoapClient and SoapService classes automatically handle much of the plumbing code that SoapSender and SoapReceiver require you to write for processing SOAP messages. We will not be discussing these higher-level classes here, because they shield details that are important to understanding how SOAP messaging actually works. In addition, these classes are very easy to understand once you are comfortable with the lower-level SoapSender and SoapReceiver classes. But once you find yourself writing the same kind of messaging code over again, by all means use these classes and avoid some manual coding.
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Note WSE 3.0 provides support for routing but does not implement the WS-Routing specification. This is
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because the WS-Addressing specification supersedes the WS-Routing specification. (The WS-Referral specification is orthogonal to the WS-Routing specification.)
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