Invalid blank line before If-Modified-Since HTTP header
-------------------------------------------------------

                 Key: NUTCH-815
                 URL: https://issues.apache.org/jira/browse/NUTCH-815
             Project: Nutch
          Issue Type: Bug
    Affects Versions: 1.0.0
         Environment: Nutch 1.0.0, Windows XP, Java 1.6.0_17
            Reporter: Pascal Dimassimo


If there is a Modified time stored in the crawldb for a link, the class 
org.apache.nutch.protocol.http.HttpResponse will use it as the value for the 
If-Modified-Since header. 

Line 131:
reqStr.append("\r\n");
if (datum.getModifiedTime() > 0) {
        reqStr.append("If-Modified-Since: " + 
HttpDateFormat.toString(datum.getModifiedTime()));
        reqStr.append("\r\n");
}

The problem is that an extra blank line is insert before this header. This make 
the header invalid:
----------------------------------------------------------------------------------
GET /tinysite/second.html HTTP/1.0
Host: localhost:8080
Accept-Encoding: x-gzip, gzip, deflate
User-Agent: nutch/Nutch-1.0
Accept-Language: en-us,en-gb,en;q=0.7,*;q=0.3

If-Modified-Since: Tue, 27 Apr 2010 13:51:50 GMT
----------------------------------------------------------------------------------

I'm using the AdaptiveFetchSchedule to set the Modified time in the crawldb. 

I've made a test by moving the line 131 after the if block and it works. I 
think this is where that line should go.

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