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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 Stack Overflow by Dominik Mack
, 2 years ago
Server returned HTTP response code: 400 for URL: --
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via Stack Overflow by Priyanka
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Server returned HTTP response code: 400 for URL:https://api.twitter.com/1.1/followers/ids.jsonscreen_name=*****&user_id=******
via Stack Overflow by Jblue
, 9 months ago
Server returned HTTP response code: 403 for URL: https://statsroyale.com/clan/99VUU8Y
java.io.IOException: Server returned HTTP response code: 400 for URL: --	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)	at java.net.URL.openStream(Unknown Source)	at com.model.Model.createTemp(Model.java:164)	at com.model.Model.checkFilter(Model.java:122)	at com.model.Model$1.actionPerformed(Model.java:50)