Sebastian Nagel created NUTCH-3039:
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             Summary: Failure to handle ftp:// URLs
                 Key: NUTCH-3039
                 URL: https://issues.apache.org/jira/browse/NUTCH-3039
             Project: Nutch
          Issue Type: Bug
          Components: plugin, protocol
    Affects Versions: 1.19
            Reporter: Sebastian Nagel
             Fix For: 1.21


Nutch fails to handle ftp:// URLs:
- URLNormalizerBasic returns the empty string because creating the URL instance 
fails with a MalformedURLException:
  {noformat}
echo "ftp://ftp.example.com/path/file.txt"; \
  | nutch normalizerchecker -stdin -normalizer urlnormalizer-basic{noformat}
- fetching a ftp:// URL with the protocol-ftp plugin enabled also fails due to 
a MalformedURLException:
  {noformat}
bin/nutch parsechecker -Dplugin.includes='protocol-ftp|parse-tika' \
   "ftp://ftp.example.com/path/file.txt";
...
Exception in thread "main" org.apache.nutch.protocol.ProtocolNotFound: 
java.net.MalformedURLException
        at 
org.apache.nutch.protocol.ProtocolFactory.getProtocol(ProtocolFactory.java:113)
...{noformat}


The issue is caused by NUTCH-2429:
- we do not provide a dedicated URL stream handler for ftp URLs
- but also do not pass ftp:// URLs to the standard JVM handler



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