title: Nutch is not parsing the entire website, only the first URL
body: <p>I'm trying to use Nutch <code>Fetcher</code> to fetch the entire website, but it only loads the first URL:</p>
  
  <pre><code>import org.apache.nutch.fetcher.Fetcher;
  new Fetcher(conf).fetch(segment, 1);
  </code></pre>
  
  <p>This is what I see in the log:</p>
  
  <pre><code>[INFO] org.apache.nutch.fetcher.Fetcher: Fetcher: starting at 2019-03-29 00:11:47
  [INFO] org.apache.nutch.fetcher.Fetcher: Fetcher: segment: /var/folders/vl/633jwjvn2jvbj9zfg1sgglhw0000gp/T/1198814103175176756/segments/20190329001146
  [WARN] org.apache.hadoop.mapreduce.JobResourceUploader: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
  [INFO] org.apache.nutch.fetcher.FetchItemQueues: Using queue mode : byHost
  [INFO] org.apache.nutch.fetcher.Fetcher: Fetcher: threads: 1
  [INFO] org.apache.nutch.fetcher.Fetcher: Fetcher: time-out divisor: 2
  [INFO] org.apache.nutch.fetcher.QueueFeeder: QueueFeeder finished: total 1 records hit by time limit : 0
  [INFO] org.apache.nutch.net.URLExemptionFilters: Found 0 extensions at point:'org.apache.nutch.net.URLExemptionFilter'
  [INFO] org.apache.nutch.fetcher.FetcherThread: FetcherThread 129 Using queue mode : byHost
  [INFO] org.apache.nutch.fetcher.Fetcher: Fetcher: throughput threshold: -1
  [INFO] org.apache.nutch.fetcher.Fetcher: Fetcher: throughput threshold retries: 5
  [INFO] org.apache.nutch.fetcher.FetcherThread: FetcherThread 133 fetching http://www.zerocracy.com/ (queue crawl delay=5000ms)
  [INFO] org.apache.nutch.protocol.RobotRulesParser: robots.txt whitelist not configured.
  [INFO] org.apache.nutch.protocol.http.Http: http.proxy.host = null
  [INFO] org.apache.nutch.protocol.http.Http: http.proxy.port = 8080
  [INFO] org.apache.nutch.protocol.http.Http: http.proxy.exception.list = false
  [INFO] org.apache.nutch.protocol.http.Http: http.timeout = 10000
  [INFO] org.apache.nutch.protocol.http.Http: http.content.limit = 65536
  [INFO] org.apache.nutch.protocol.http.Http: http.agent = yc/Nutch-1.15
  [INFO] org.apache.nutch.protocol.http.Http: http.accept.language = en-us,en-gb,en;q=0.7,*;q=0.3
  [INFO] org.apache.nutch.protocol.http.Http: http.accept = text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  [INFO] org.apache.nutch.protocol.http.Http: http.enable.cookie.header = true
  [INFO] org.apache.nutch.fetcher.FetcherThread: FetcherThread 133 has no more work available
  [INFO] org.apache.nutch.fetcher.FetcherThread: FetcherThread 133 -finishing thread FetcherThread, activeThreads=0
  [INFO] org.apache.nutch.fetcher.Fetcher: -activeThreads=0, spinWaiting=0, fetchQueues.totalSize=0, fetchQueues.getQueueCount=0
  [INFO] org.apache.nutch.fetcher.Fetcher: -activeThreads=0
  [INFO] org.apache.nutch.fetcher.Fetcher: Fetcher: finished at 2019-03-29 00:11:49, elapsed: 00:00:02
  </code></pre>
  
  <p>What am I missing? It's Nutch 1.15.</p>