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  1. ,

    401 means "Unauthorized", so there must be something with your credentials. You need to pass the authentication to let the server know its a valid user. Check whether the authentication details are provided.

Solutions on the web

via GitHub by koppor
, 1 year ago
Server returned HTTP response code: 504 for URL: http://data.crossref.org/10.1145%2F2460383.2460389
via Stack Overflow by nmodi
, 2 years ago
Server returned HTTP response code: 403 for URL: http://translate.google.com/
via Stack Overflow by pamobo0609
, 2 years ago
Server returned HTTP response code: 500 for URL: http://some.url/api/save
via GitHub by nishaatr
, 1 year ago
Server returned HTTP response code: 401 for URL: https://stash-server/rest/build-status/1.0/commits/1223f29d516dc12598ff3ddb916ebc3105b73138
via Stack Overflow by foxwendy
, 2 years ago
Server returned HTTP response code: 400 for URL: ><a href="http://xxxx.com/WebServices/VinApi.asmx" rel="nofollow">http://xxxx.com/WebServices/VinApi.asmx</a>
java.io.IOException: Server returned HTTP response code: 504 for URL: http://data.crossref.org/10.1145%2F2460383.2460389 at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at net.sf.jabref.util.Util.getResultsWithEncoding(Util.java:651) at net.sf.jabref.importer.fetcher.DOItoBibTeXFetcher.getEntryFromDOI(DOItoBibTeXFetcher.java:111)