qt - what's the meaning of `QNetworkReply::ProtocolUnknownError`? -

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i use object of qnetworkaccessmanager post json data website.

when handle reply pointer of qnetworkreply class in slot function, value of reply->error() 301 , value of 'reply->errorstring()' error downloading http://www.example.com/query - server replied: service unavailable.

i check documentation of qnetworkreply, description of error is:

    qnetworkreply::protocolunknownerror|301|the network access api cannot honor request because protocol not known

and known error different form http status 301.

and have add http:// before url.

e..., can give info this?


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