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I am running a lot of tests and have started to get 403 errors.

I am using a key and certainly have not exceeded my quota.

Am I running foul of some yet unmentioned throttling threshold and if so, what measures should I emplace in order to not be surprised by 403s etc?

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any json returns? what about http response headers? how many requests did you make per minute? – YOU May 31 '10 at 6:36
There should be a JSON response (with some additional information) if the API is cutting you off, are you seeing anything like that? – Kevin Montrose May 31 '10 at 6:38
@kev - wasn't looking. am now. will update with observations. – Sky Sanders May 31 '10 at 7:29

Ran into this myself early on. See this question for more info:

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I think he should get "RequestLimitExceeded" Error JSON, if that is the case, but his problem looks more like from DOS Protection mechanism for me. – YOU May 31 '10 at 6:34
Key behavior has changed to handle the "multiple app" scenario, so alternating between Key and No Key shouldn't be an issue. – Kevin Montrose May 31 '10 at 6:57

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