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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.

Solutions on the web

via GitHub by IgorGanapolsky
, 1 year ago
Server returned HTTP response code: 401 for URL: https://android.googleapis.com/gcm/sendPlease ensure that API_KEY has been replaced by the server API key, and that the device's registration token is correct (if specified).
via Stack Overflow by celik
, 1 year ago
Server returned HTTP response code: 400 for URL: https://api.example.com/api-token-auth/
via Stack Overflow by Meriem.ZJ
, 7 months ago
Server returned HTTP response code: 400 for URL: https://www.googleapis.com/customsearch/v1?key=XXXX&cx=013036536707430787589:_pqjad5hr1a&q=the best universities&alt=json&num=10&start=1
via Stack Overflow by TDeveloper
, 9 months ago
Server returned HTTP response code: 403 for URL: https://www.googleapis.com/customsearch/v1?key=????&cx=013036536707430787589:_pqjad5hr1a&q=?????
via Stack Overflow by ThatGuy343
, 2 years ago
Server returned HTTP response code: 400 for URL: https://www.googleapis.com/urlshortener/v1/url
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Server returned HTTP response code: 401 for URL: https://android.googleapis.com/gcm/sendPlease ensure that API_KEY has been replaced by the server API key, and that the device's registration token is correct (if specified). 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 gcm.play.android.samples.com.gcmsender.GcmSender.main(GcmSender.java:82)