The REST server fails to parse

text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2

According to RFC-2616, media-range is defined as

  media-range    = 
                   ( "*/*"
                   | ( type "/" "*" )
                   | ( type "/" subtype )
                   ) *( ";" parameter )

and * is not valid, but the java internal http client sends this in its default requests. More info in https://bugs.openjdk.java.net/browse/JDK-8163921.