[Python-Dev] Can ftp url start with file:// ? (original) (raw)

Bill Janssen janssen at parc.com
Fri Jul 9 20:04:11 CEST 2010

Tim Lesher <tlesher at gmail.com> wrote:

On Fri, Jul 9, 2010 at 12:41, Bill Janssen <janssen at parc.com> wrote:

> So, FTP is not the "default protocol". On the other hand, if > actually begins with "ftp.", it's a pretty good guess that FTP will > work.

Actually, FTP is the default protocol for most URLs with hostnames in urllib.py. urllib.openfile() delegates to openftp() if there's a any host other than the exact string "localhost", and openlocalfile() otherwise.

I just meant to point out that it's not specified that way by any RFC. And, while FTP might have been a good default choice last century when urllib.py was originally written, times have changed. I'd suggest that HTTP is a better (more likely to succeed) default choice in this century.

If we want to perpetuate these guessing heuristics, I'd suggest using FTP if the hostname starts with "ftp.", and HTTP if the hostname starts with "www.", and raise an error otherwise.

Bill

>>> import urllib >>> f =urllib.urlopen('file:///foo.txt') >>> f =urllib.urlopen('file://localhost/foo.txt') >>> f = urllib.urlopen('file://www.google.com/') Traceback (most recent call last): File "", line 1, in File "c:\python25\lib\urllib.py", line 82, in urlopen return opener.open(url) File "c:\python25\lib\urllib.py", line 190, in open return getattr(self, name)(url) File "c:\python25\lib\urllib.py", line 457, in openfile return self.openftp(url) File "c:\python25\lib\urllib.py", line 538, in openftp ftpwrapper(user, passwd, host, port, dirs) File "c:\python25\lib\urllib.py", line 844, in init self.init() File "c:\python25\lib\urllib.py", line 850, in init self.ftp.connect(self.host, self.port) File "c:\python25\lib\ftplib.py", line 129, in connect raise socket.error, msg IOError: [Errno ftp error] (10060, 'Operation timed out') >>> f =urllib.urlopen('file://127.0.0.1/foo.txt') Traceback (most recent call last): File "", line 1, in File "c:\python25\lib\urllib.py", line 82, in urlopen return opener.open(url) File "c:\python25\lib\urllib.py", line 190, in open return getattr(self, name)(url) File "c:\python25\lib\urllib.py", line 457, in openfile return self.openftp(url) File "c:\python25\lib\urllib.py", line 538, in openftp ftpwrapper(user, passwd, host, port, dirs) File "c:\python25\lib\urllib.py", line 844, in init self.init() File "c:\python25\lib\urllib.py", line 850, in init self.ftp.connect(self.host, self.port) File "c:\python25\lib\ftplib.py", line 129, in connect raise socket.error, msg IOError: [Errno ftp error] (10061, 'Connection refused') -- Tim Lesher <tlesher at gmail.com>

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