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term I think this is a mistake HTTP is not exactly perfect and it forces many limitations on the Web services platform (eg no callbacks) This means you should expect alternate transports to emerge with higher capabilities and lots of cool, useful features If, in the future, you decide to expose the same Web service over another transport, eg Message Queuing, then you have to figure out session management all over again Generally speaking, try not to rely on HTTP-specific features as much as possible
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Use SOAP headers for session management
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SOAP headers can be used to communicate cookies much like HTTP cookies You can build your own sessions using SOAP headers which are transport-independent (would work just as well over SMTP as over HTTP) See chapters 5 and 6 for details on using SOAP headers and chapter 13 for an example implementing sessions with SOAP headers
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Use RequestElement routing
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Normally SOAPAction is used to route request messages to the appropriate methods This has many problems not the least of which is its reliance on HTTP For the reasons explained in chapter 6, avoid using SOAPAction if you can By default, ASPNET Web services rely on SOAPAction You can change that by adding a SoapDocumentServiceAttribute attribute to the Web service class and setting its RoutingStyle property to SoapServiceRoutingStyleRequestElement See chapter 6 for more details on the RoutingStyle property
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Use one-way operations
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SOAP defines client-to-service communications in terms of messages If you are using document style messages, nothing says that every request must have a response message In fact, WSDL defines a one- way operation as one that has a request message and no response message This can be a very powerful design pattern for submitting requests or notifying services without requiring a response A client sends a request and receives an empty HTTP response as soon as the request reaches your Web method Of course you lose the ability to return data or even error information but there are some scenarios where this still makes sense See chapter 6 for details on implementing one-way operations and chapter 13 for an example service with a one-way operation
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Don't implement properties on Web services
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Properties just don t belong on Web services Sure you can implement a property procedure and store the data in the ASPNET session instead of a private variable But just because you can doesn t mean you should It s appalling to see some literature out there with examples of implementing properties on Web services Web services are all about exchanging documents based on messaging Get over properties and design stateless, message-oriented Web services
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Use distributed transactions only if you need them
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It s very easy to use distributed transactions (also known as Enterprise Services, COM+, and DTC transactions) within a Web method Simply set the WebMethodAttribute s TransactionOption property to RequiresNew and you re set Here s another good example of just because you can doesn t mean you should Please understand that distributed transactions are designed for specific scenarios and are not intended to replace TSQL nor ADONET transactions Each has its role and the scenarios where it makes sense See chapter 6 for a discussion of when distributed transactions make sense and a link to an MSDN article that compares the performance of the three transaction control mechanisms
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I ve seen far too many examples showing developers how to encrypt SOAP messages between client and service To me, this is exactly like reinventing the wheel All such examples rely on hand-crafted encryption code using the NET framework s cryptography classes The main argument for using this approach vs SSL (the wheel) is that SSL causes a performance hit Intuitively, I would think that if you are going to do your own encryption, either it won t be as cryptographically strong as SSL or it will be just as
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