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

GitHub | xnerus | 8 months ago
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    Root Cause Analysis

    1. org.apache.http.conn.UnsupportedSchemeException

      null protocol is not supported

      at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect()
    2. Apache HttpClient
      CloseableHttpClient.execute
      1. org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:108)
      2. org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353)
      3. org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380)
      4. org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
      5. org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
      6. org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
      7. org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
      8. org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
      9. org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
      10. org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)
      11. org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
      11 frames
    3. com.norconex.collector
      AbstractImporterStage.execute
      1. com.norconex.collector.http.robot.impl.StandardRobotsTxtProvider.getRobotsTxt(StandardRobotsTxtProvider.java:87)
      2. com.norconex.collector.http.pipeline.importer.HttpImporterPipeline$DelayResolverStage.executeStage(HttpImporterPipeline.java:81)
      3. com.norconex.collector.http.pipeline.importer.AbstractImporterStage.execute(AbstractImporterStage.java:31)
      4. com.norconex.collector.http.pipeline.importer.AbstractImporterStage.execute(AbstractImporterStage.java:24)
      4 frames
    4. com.norconex.commons
      Pipeline.execute
      1. com.norconex.commons.lang.pipeline.Pipeline.execute(Pipeline.java:91)
      1 frame
    5. com.norconex.collector
      AbstractCrawler$ProcessReferencesRunnable.run
      1. com.norconex.collector.http.crawler.HttpCrawler.executeImporterPipeline(HttpCrawler.java:335)
      2. com.norconex.collector.core.crawler.AbstractCrawler.processNextQueuedCrawlData(AbstractCrawler.java:503)
      3. com.norconex.collector.core.crawler.AbstractCrawler.processNextReference(AbstractCrawler.java:390)
      4. com.norconex.collector.core.crawler.AbstractCrawler$ProcessReferencesRunnable.run(AbstractCrawler.java:771)
      4 frames
    6. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
      3. java.lang.Thread.run(Unknown Source)
      3 frames