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SOAP Worst Practices Part 1: Non-XML Content

There are a lot of useful SOAP Web Services. Whether it is a simple zip code lookup service, or a more complex order entry system, a well-implemented SOAP Web Service can make machine to machine communication very reliable, efficient, and best of all, easy.

However, there are also a lot of poorly-implemented SOAP Web Services, and they can cause more problems than they intend to solve. This is the first in a series of articles that attempt to expose some of the more common mistakes and misunderstandings people make when implementing a SOAP Web Service.

SOAP Worst Practice #1: Non-XML Content

One of the main reasons to create a SOAP Web Service over a REST one is that SOAP provides a standardized method to publish the message format for your service. The message is in XML, and its structure is defined in the WSDL, or Web Service Definition Language. If you have an XML document that you want to transfer, embed its format in the WSDL and any consumer will be able to know the format to send to it.

But, if you have non-XML data to transfer, SOAP is probably not your best choice. Continue reading