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Table 4 Listing of response codes that the site might return

From: Infrastructure for the life sciences: design and implementation of the UniProt website

Code Description
200 The request was processed successfully.
301 Moved (permanently). Use the new address for future requests
302 Moved (temporarily)
400 Bad request. There is a problem with your input.
404 Not found. The resource you requested doesn't exist.
410 Gone. The resource you requested was removed.
500 Internal server error. Most likely a temporary problem, but if the problem persists please contact the site operators.
503 Service not available. The server is being updated, try again later.