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HTTP 404
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=== Proxy servers === Some [[proxy server]]s generate a 404 error when a [[List of HTTP status codes#5xx server errors|500-range error code]] would be more correct. If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead. This can confuse programs that expect and act on specific responses, as they can no longer easily distinguish between an absent web server and a missing web page on a web server that is present.
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