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org.apache.http.NoHttpResponseException: The target server failed to respond	at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:95)	at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:62)	at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:254)	at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:289)	at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:252)	at org.apache.http.impl.conn.ManagedClientConnectionImpl.receiveResponseHeader(ManagedClientConnectionImpl.java:191)	at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:300)	at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:127)	at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:716)	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:521)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)	at edu.isi.karma.util.HTTPUtil.invokeHTTPRequest(HTTPUtil.java:102)	at edu.isi.karma.util.HTTPUtil.executeHTTPPostRequest(HTTPUtil.java:64)	at edu.isi.karma.util.HTTPUtil.executeHTTPPostRequest(HTTPUtil.java:77)	at edu.isi.karma.controller.update.WorksheetCleaningUpdate.generateJson(WorksheetCleaningUpdate.java:134)	at edu.isi.karma.controller.update.UpdateContainer.generateJson(UpdateContainer.java:87)	at edu.isi.karma.controller.update.UpdateContainer.generateJson(UpdateContainer.java:120)	at edu.isi.karma.webserver.RequestController.doPost(RequestController.java:79)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:698)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:505)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:138)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:564)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:213)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1096)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:432)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:175)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1030)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:201)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)	at org.eclipse.jetty.server.Server.handle(Server.java:445)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:268)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:229)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:601)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:532)	at java.lang.Thread.run(Thread.java:745)