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  1. ,
    Expert tip

    Check if you didn't set RequestProperty Content-Type to the wrong type or if you're trying to send the wrong file to the server.

  2. ,

    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 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 raghzz
, 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 raghzz
, 2 years ago
Server returned HTTP response code: 400 for URL: https://americas.universal-api.travelport.com/B2BGateway/connect/uAPI/SystemService
via Stack Overflow by celik
, 1 year ago
Server returned HTTP response code: 400 for URL: https://api.example.com/api-token-auth/
via serviceorientedarchitect.com by Unknown author, 1 year ago
Server returned HTTP response code: 403 for URL: https://downloads.gradle.org/distributions/gradle-2.11-bin.zip
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)