Gerard Bouchar created NUTCH-2563:
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             Summary: HTTP header spellchecking issues
                 Key: NUTCH-2563
                 URL: https://issues.apache.org/jira/browse/NUTCH-2563
             Project: Nutch
          Issue Type: Sub-task
            Reporter: Gerard Bouchar


{color:#333333}When reading http headers, for each header, the 
SpellCheckedMetadata class computes a Levenshtein distance between it and every 
 known header in the HttpHeaders interface. Not only is that slow, 
non-standard, and non-conform to browsers' behavior, but it also causes bugs 
and prevents us from accessing the real headers sent by the HTTP server.{color}
 * {color:#333333}Example: [http://www.taz.de/!443358/] . The server sends a 
*Client-Transfer-Encoding: chunked* header, but SpellCheckedMetadata corrects 
it to *Transfer-Encoding: chunked*. Then, HttpResponse (in protocol-http) tries 
to read the HTTP body as chunked, whereas it is not.{color}

{color:#333333}I personally think that HTTP header spell checking is a bad 
idea, and that this logic should be completely removed. But if it were to be 
kept, the threshold (SpellCheckedMetadata.TRESHOLD_DIVIDER) should be higher 
(we internally set it to 5 as a temporary fix for this issue){color}



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