org.apache.http.conn.UnsupportedSchemeException: null protocol is not supported

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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 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)

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