Given that 400 is bad request, and the client SHOULD NOT repeat the
request without modifications ('s emphasis), and 503 means
service unavailable, try again later, and can include a retry-after
header, would it not have made more sense to change the response code
of the REST API to the "more correct" one?

On Dec 3, 10:41 pm, Wilhelm Bierbaum <> wrote:
> In an effort to simplify our APIs, we are standardizing the response
> codes returned by our various systems. Historically, the Search API
> has returned 503 for rate limiting whereas the REST API has returned
> 400. So, we are changing the response codes sent back from the Search
> API.
> Starting Wednesday, December 16th, 2009 the search API will respond
> with error code 400 in the event that the number of requests you have
> made exceeds the quota afforded by your rate limit.
> Please update your response handler accordingly.
> If you have any questions, please feel free to post them on twitter-
> development-talk.

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