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org.apache.http.conn.UnsupportedSchemeException: null protocol is not supported at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:108) at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353) at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380) at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184) at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55) at com.norconex.collector.http.robot.impl.StandardRobotsTxtProvider.getRobotsTxt(StandardRobotsTxtProvider.java:87) at com.norconex.collector.http.pipeline.importer.HttpImporterPipeline$DelayResolverStage.executeStage(HttpImporterPipeline.java:81) at com.norconex.collector.http.pipeline.importer.AbstractImporterStage.execute(AbstractImporterStage.java:31) at com.norconex.collector.http.pipeline.importer.AbstractImporterStage.execute(AbstractImporterStage.java:24) at com.norconex.commons.lang.pipeline.Pipeline.execute(Pipeline.java:91) at com.norconex.collector.http.crawler.HttpCrawler.executeImporterPipeline(HttpCrawler.java:335) at com.norconex.collector.core.crawler.AbstractCrawler.processNextQueuedCrawlData(AbstractCrawler.java:503) at com.norconex.collector.core.crawler.AbstractCrawler.processNextReference(AbstractCrawler.java:390) at com.norconex.collector.core.crawler.AbstractCrawler$ProcessReferencesRunnable.run(AbstractCrawler.java:771) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)