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https://issues.apache.org/jira/browse/NUTCH-2452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16219602#comment-16219602
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Hiran Chaudhuri commented on NUTCH-2452:
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It seems I am able to fix the problem with this line in method
org.apache.nutch.protocol.ftp.FtpResponse(URL, CrawlDatum, Ftp, Configuration):
{{path = java.net.URLDecoder.decode(path, "UTF-8");}}
> Problem retrieving encoded URLs via FTP?
> ----------------------------------------
>
> Key: NUTCH-2452
> URL: https://issues.apache.org/jira/browse/NUTCH-2452
> Project: Nutch
> Issue Type: Bug
> Components: protocol
> Affects Versions: 1.13
> Environment: Ubuntu 16.04.3 LTS
> OpenJDK 1.8.0_131
> nutch 1.14-SNAPSHOT
> Synology RS816
> Reporter: Hiran Chaudhuri
>
> I tried running Nutch on my Synology NAS. As SMB protocol is not contained in
> Nutch, I turned on FTP service on the NAS and configured Nutch to crawl
> ftp://nas.
> The experience gives me varying results which seem to point to problems
> within Nutch. However this may need further evaluation.
> As some files could not be downloaded and I could not see a good error
> message I changed the method
> org.apache.nutch.protocol.ftp.FTP.getProtocolOutput(Text, CrawlDatum) to not
> only return protocol status but send the full exception and stack trace to
> the logs:
> {{ } catch (Exception e) {
> LOG.warn("Could not get {}", url, e);
> return new ProtocolOutput(null, new ProtocolStatus(e));
> }
> }}
> With this modification I suddenly see such messages in the logfile:
> {{2017-10-25 14:14:37,254 TRACE org.apache.nutch.protocol.ftp.Ftp - fetching
> ftp://nas/silver-sda2/home/vivi/Desktop/Pictures/Kenya%20Pics/
> 2017-10-25 14:14:37,512 WARN org.apache.nutch.protocol.ftp.Ftp - Could not
> get ftp://nas/silver-sda2/home/vivi/Desktop/Pictures/Kenya%20Pics/
> org.apache.nutch.protocol.ftp.FtpError: Ftp Error: 404
> at org.apache.nutch.protocol.ftp.Ftp.getProtocolOutput(Ftp.java:151)
> at org.apache.nutch.fetcher.FetcherThread.run(FetcherThread.java:340)
> }}
> Please mind the URL was not configured from me. Instead it was obtained by
> crawling my NAS. Also the URL looks perfectly fine to me. Even more, using
> Firefox and the same authentication data on the same URL displays the
> directory successfully. Therefore I suspect the FTP client is unable to
> decode the URL such that the FTP server would understand it.
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