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org.apache.http.conn.UnsupportedSchemeException: null protocol is not supported
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.fetch.impl.GenericMetadataFetcher.fetchHTTPHeaders(GenericMetadataFetcher.java:135)	at com.norconex.collector.http.pipeline.importer.MetadataFetcherStage.executeStage(MetadataFetcherStage.java:51)	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)