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    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 GitHub by Wihunda
, 1 year ago
Server returned HTTP response code: 520 for URL: https://api.inventivetalent.org/spigot/resource-simple/9488
via Stack Overflow by ThatGuy343
, 2 years ago
Server returned HTTP response code: 400 for URL: https://www.googleapis.com/urlshortener/v1/url
via GitHub by raghumaddali
, 2 years ago
Server returned HTTP response code: 400 for URL: https://americas.universal-api.pp.travelport.com/B2BGateway/connect/uAPI/HotelService
via GitHub by raghumaddali
, 2 years ago
Server returned HTTP response code: 400 for URL: https://americas.universal-api.travelport.com/B2BGateway/connect/uAPI/SystemService
via GitHub by Pr1ckl3s
, 2 weeks ago
Server returned HTTP response code: 401 for URL: https://api.spotify.com/v1/tracks/7wGoVu4Dady5GV0Sv4UIsx Opening ...
via Stack Overflow by Eddy
, 2 years ago
Server returned HTTP response code: 400 for URL: https://api.parse.com/1/classes/Cars?where={Active:1}
java.io.IOException: Server returned HTTP response code: 520 for URL: https://api.inventivetalent.org/spigot/resource-simple/9488 at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1840) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254) at io.github.dre2n.dungeonsxl.util.commons.update.spigot.SpigotUpdater.run(SpigotUpdater.java:131)