Design web application API codes to extensible and can adapt to change

Design web application API codes to extensible and can adapt to change with little effort to cater to SOA architecture.
How will you all design to cater for this kind of requirement?

RonaldMacdonald wrote:
Design web application API codes to extensible and can adapt to change with little effort to cater to SOA architecture.I don't worry about change until I can write something that can actually be used once. I worry about use before reuse.
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How will you all design to cater for this kind of requirement?I use Spring. It helps.
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