Description:
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In the curl_setopt documentation page, under CURLOPT_FAILONERROR, it says "TRUE to fail silently if the HTTP code returned is greater than 300..."  It should say "greater than or equal to 400" not "greater than 300".

Expected result:
----------------
HTTP status codes >= 400 are errors according to RFC2616:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
  
The option's behavior is correct.  When I ran a simple HTTP GET with against a page that returns 301 (redirect), with CURLOPT_FAILONERROR set to true, the error code returned is zero (no error).

If you look in the libcurl documentation of error codes, it says, "CURLE_HTTP_RETURNED_ERROR (22)  This is returned if CURLOPT_FAILONERROR is set TRUE and the HTTP server returns an error code that is >= 400."

http://curl.haxx.se/libcurl/c/libcurl-errors.html

However, if you look in the set_opt function's documentation, it says, "CURLOPT_FAILONERROR A non-zero parameter tells the library to fail silently if the HTTP code returned is equal to or larger than 300..."

http://curl.haxx.se/libcurl/c/curl_easy_setopt.html

This is probably wrong.  I have contacted libcurl to update this.