The vast majority of RESTful APIs follow a simple “request-response” message exchange pattern, but that pattern is often too limiting and is not sufficient to achieving robust and reliable application performance.  We frequently get questions from customers asking:  ‘How I design asynchronous APIs?’ and ‘How I design an API that allows for the concurrent modification of the same API resource without bringing the resource into inconsistent state?’.  In this blog post, we present two approaches answering these questions using standard HTTP headers and status codes.

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