Re: Question about using urllib2 to load a url
- From: "Kushal Kumaran" <kushal.kumaran@xxxxxxxxx>
- Date: 1 Apr 2007 21:31:59 -0700
On Apr 2, 2:52 am, "ken" <ken.carl...@xxxxxxxxx> wrote:
Hi,
i have the following code to load a url.
My question is what if I try to load an invalide url
("http://www.heise.de/";), will I get an IOException? or it will wait
forever?
Depends on why the URL is invalid. If the URL refers to a non-
existent domain, a DNS request will result in error and you will get
an "urllib2.URLError: <urlopen error (-2, 'Name or service not
known')>". If the name resolves but the host is not reachable, the
connect code will timeout (eventually) and result in an
"urllib2.URLError: <urlopen error (113, 'No route to host')>". If the
host exists but does not have a web server running, you will get an
"urllib2.URLError: <urlopen error (111, 'Connection refused')>". If a
webserver is running but the requested page does not exist, you will
get an "urllib2.HTTPError: HTTP Error 404: Not Found".
The URL you gave above does not meet any of these conditions, so
results in a valid handle to read from.
If, at any time, an error response fails to reach your machine, the
code will have to wait for a timeout. It should not have to wait
forever.
Thanks for any help.
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
urllib2.install_opener(opener)
txheaders = {'User-agent': 'Mozilla/5.0 (X11; U; Linux i686; en-
US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3'}
try:
req = Request(url, txdata, txheaders)
handle = urlopen(req)
except IOError, e:
print e
print 'Failed to open %s' % url
return 0;
--
Kushal
.
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