Bad input parameter. The error message should indicate which parameter is wrong and why. We use this error to indicate some request parameters did not pass the validation test. Wrong region, wrong search engine, etc. This error means your request is wrong in some way, retrying the same request will probably not fix it.

Bad API Key. Your key may have been mistyped or you do not have access to our API. Retrying the request will not solve the issue.

Too many requests or connections. Your server made too many requests or opened too many connections. Please slow it down and close the unused connections. Enabling the 'keep-alive' mechanism may help to reuse connections.

Internal server error. This is a generic error for some unexpected action that might happen at our side. This error should never appear to you, but if it does, you should retry later and contact us if it persists.

Internal server error due a database timeout. This error should never appear to you, but if it does, you should retry later and contact us if it persists.

Internal server error similar to error 502. This error should never appear to you, but if it does, you should retry later and contact us if it persists.