Hello,
In file byterange.py class ftpwrapper, urlgrabber use REST command and
check return code to find out if the command is supported :
----
except ftplib.error_perm, reason:
if str(reason)[:3] == '501':
# workaround for REST not supported error
fp, retrlen = self.retrfile(file, type)
fp = RangeableFileObject(fp, (rest,''))
return (fp, retrlen)
elif str(reason)[:3] != '550':
raise IOError, ('ftp error', reason), sys.exc_info()[2]
----
But the RFC 640 (http://www.faqs.org/rfcs/rfc640.html) gives 500, 501,
502, 421, 530 & 350 as possible return code. In these, the first three
50x may apply for an unsupported/disabled REST command :
- 500 Syntax error, command unrecognized
[This may include errors such as command line too
long.]
- 501 Syntax error in parameters or arguments
- 502 Command not implemented
As far as I am concerned, I would accept any 50x result to use REST-less
download :
----
5yz Permanent Negative Completion reply
The command was not accepted and the requested action did
not take place. The User-process is discouraged from
repeating the exact request (in the same sequence). Even
some "permanent" error conditions can be corrected, so the
human user may want to direct his User-process to
reinitiate the command sequence by direct action at some
point in the future (e.g. after the spelling has been
changed, or the user has altered his directory status.)
----
x0z Syntax - These replies refer to syntax errors,
syntactically correct commands that don't fit any
functional category, unimplemented or superfluous
commands.
----
François
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