What does idempotent mean?
From wikipedia …
“Idempotence is the property of certain operations in mathematics and computer science, that can be applied multiple times without changing the result beyond the initial application. … In computer science, the term idempotent is used more comprehensively to describe an operation that will produce the same results if executed once or multiple times.”
- Looking up customer name – idempotent
- Updating customer address – idempotent
- Cancelling an order – idempotent
- Placing an order – not idemptotent (that is why don’t hit the submit button twice)
HTTP GET is idempotent but POST is not.