HTTP ERROR 400 Bad Request - java.lang.IllegalArgumentException: HTML format is not available for collection data sets!

URI:/10.1594/PANGAEA.150019
STATUS:400
MESSAGE:Bad Request - java.lang.IllegalArgumentException: HTML format is not available for collection data sets!
SERVLET:pangaea-doi-servlet
CAUSED BY:java.lang.IllegalArgumentException: HTML format is not available for collection data sets!

Caused by:

java.lang.IllegalArgumentException: HTML format is not available for collection data sets!
	at de.pangaea.doiresolver.PangaeaDOIServlet.internalStreamDataset(PangaeaDOIServlet.java:580)
	at de.pangaea.doiresolver.PangaeaDOIServlet.doDataSet(PangaeaDOIServlet.java:1017)
	at de.pangaea.doiresolver.PangaeaDOIServlet.doGet(PangaeaDOIServlet.java:1065)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:503)
	at de.pangaea.doiresolver.PangaeaDOIServlet.service(PangaeaDOIServlet.java:1073)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
	at org.eclipse.jetty.ee8.servlet.ServletHolder.handle(ServletHolder.java:640)
	at org.eclipse.jetty.ee8.servlet.ServletHandler.doHandle(ServletHandler.java:456)
	at org.eclipse.jetty.ee8.nested.ScopedHandler.nextHandle(ScopedHandler.java:181)
	at org.eclipse.jetty.ee8.nested.ContextHandler.doHandle(ContextHandler.java:859)
	at org.eclipse.jetty.ee8.nested.ScopedHandler.nextScope(ScopedHandler.java:152)
	at org.eclipse.jetty.ee8.servlet.ServletHandler.doScope(ServletHandler.java:423)
	at org.eclipse.jetty.ee8.nested.ScopedHandler.nextScope(ScopedHandler.java:150)
	at org.eclipse.jetty.ee8.nested.ContextHandler.doScope(ContextHandler.java:804)
	at org.eclipse.jetty.ee8.nested.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.ee8.nested.Dispatcher.forward(Dispatcher.java:136)
	at org.eclipse.jetty.ee8.nested.Dispatcher.forward(Dispatcher.java:114)
	at de.pangaea.doiresolver.DOIResolverProxyServlet.doResponse(DOIResolverProxyServlet.java:137)
	at net.handle.apps.servlet_proxy.HDLProxy.doGet(HDLProxy.java:547)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:503)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
	at org.eclipse.jetty.ee8.servlet.ServletHolder.handle(ServletHolder.java:640)
	at org.eclipse.jetty.ee8.servlet.ServletHandler.doHandle(ServletHandler.java:456)
	at org.eclipse.jetty.ee8.nested.ScopedHandler.nextHandle(ScopedHandler.java:181)
	at org.eclipse.jetty.ee8.nested.ContextHandler.doHandle(ContextHandler.java:859)
	at org.eclipse.jetty.ee8.nested.ScopedHandler.nextScope(ScopedHandler.java:152)
	at org.eclipse.jetty.ee8.servlet.ServletHandler.doScope(ServletHandler.java:423)
	at org.eclipse.jetty.ee8.nested.ScopedHandler.nextScope(ScopedHandler.java:150)
	at org.eclipse.jetty.ee8.nested.ContextHandler.doScope(ContextHandler.java:804)
	at org.eclipse.jetty.ee8.nested.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.ee8.nested.ContextHandler.handle(ContextHandler.java:1402)
	at org.eclipse.jetty.ee8.nested.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1293)
	at org.eclipse.jetty.ee8.nested.HttpChannel.dispatch(HttpChannel.java:623)
	at org.eclipse.jetty.ee8.nested.HttpChannel.handle(HttpChannel.java:455)
	at org.eclipse.jetty.ee8.nested.ContextHandler$CoreContextHandler$CoreToNestedHandler.handle(ContextHandler.java:2234)
	at org.eclipse.jetty.server.Handler$Wrapper.handle(Handler.java:716)
	at org.eclipse.jetty.server.handler.CrossOriginHandler.handle(CrossOriginHandler.java:336)
	at org.eclipse.jetty.server.Handler$Wrapper.handle(Handler.java:716)
	at org.eclipse.jetty.server.handler.ConditionalHandler.nextHandler(ConditionalHandler.java:421)
	at org.eclipse.jetty.server.handler.QoSHandler.onConditionsNotMet(QoSHandler.java:218)
	at org.eclipse.jetty.server.handler.ConditionalHandler.handle(ConditionalHandler.java:380)
	at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:765)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:181)
	at org.eclipse.jetty.server.Handler$Wrapper.handle(Handler.java:716)
	at de.pangaea.startup.ProcessHeadersHandler.handle(ProcessHeadersHandler.java:58)
	at org.eclipse.jetty.server.Server.handle(Server.java:179)
	at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:619)
	at org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:411)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:322)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:99)
	at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:478)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:441)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:293)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:201)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:410)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:971)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1201)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1156)
	at java.base/java.lang.Thread.run(Thread.java:840)