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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.

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via Google Groups by Deepak Jain, 1 year ago
Server returned HTTP response code: 503 for URL: http://cobertura.sourceforge.net/xml/coverage-04.dtd
via GitHub by X-NoNAME
, 2 years ago
Server returned HTTP response code: 429 for URL: https://client-s.gateway.messenger.live.com/v1/users/ME/endpoints
via GitHub by GrumpyOet
, 1 year ago
Server returned HTTP response code: 403 for URL: http://sl ither.io/i49526.txt
via GitHub by Small-Ku
, 1 year ago
Server returned HTTP response code: 403 for URL: http://repo.glowstone.net/service/local/repositories/central/content/org/slf4j/slf4j-jdk14/1.7.15/slf4j-jdk14-1.7.15.jar
via Stack Overflow by Chris
, 2 years ago
Server returned HTTP response code: 401 for URL: https://something.mySharePoint.com/_api/search/query?
via Stack Overflow by Up.Reckless
, 2 years ago
Server returned HTTP response code: 500 for URL: http://www.aogc2.state.ar.us:8080/DWClient/Login.aspx?DWSubSession=9852&v=1589
java.io.IOException: Server returned HTTP response code: 503 for URL: 
 http://cobertura.sourceforge.net/xml/coverage-04.dtd	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1839)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:646)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1300)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:1267)	at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:263)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1164)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1050)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:964)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)