HTTP 501 Not Implemented Error - Meaning & Fix
The HTTP 501 Not Implemented error indicates that the server lacks the capability to fulfill the requested operation. This error is not due to a recognizable or supported request method. It is a server-side issue requiring administrative attention.
Main causes
The server does not support the functionality required to fulfill the request.
The server does not recognize the request method used in the HTTP request.
The server recognizes the request method but is configured not to support it.
The server lacks the necessary coding or resources to support the requested method.
# Request example curl -X POST https://sandbox.oxylabs.io/ -H 'Accept: */*;q=0.8' -H 'Accept-Encoding: br' -H 'User-Agent: Mozilla/5.0'
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Common fixes
Check nginx error logs for specific messages that indicate what might have caused the termination.
Verify nginx configuration files for any incorrect settings or conflicts that could cause the server to terminate connections.
Increase timeout values in nginx settings to prevent premature termination of connections.
Ensure that all backend services connected to nginx are running correctly and are properly configured to handle requests.
# Response example HTTP/1.1 501 Not Implemented Content-Type: text/html501 Not Implemented Not Implemented
The requested method is not implemented on this server.
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