[ python-Bugs-947571 ] urllib.urlopen() fails to raise exception

Tue May 4 05:58:43 EDT 2004

Bugs item #947571, was opened at 2004-05-04 11:57
Message generated for change (Settings changed) made by lemburg
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=947571&group_id=5470

Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: M.-A. Lemburg (lemburg)
Assigned to: Nobody/Anonymous (nobody)
>Summary: urllib.urlopen() fails to raise exception

Initial Comment:
I've come across a strange problem: even though
the docs say that urllib.urlopen() should raise an IOError
for server errors (e.g. 404s), all versions of Python that
I've tested (1.5.2 - 2.3) fail to do so.

Example:
>>> import urllib
>>> f =
urllib.urlopen('http://www.example.net/this-url-does-not-exist/')
>>> print f.read()
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML><HEAD>
<TITLE>404 Not Found</TITLE>
</HEAD><BODY>
<H1>Not Found</H1>
The requested URL /this-url-does-not-exist/ was not
found on this server.<P>
<HR>
<ADDRESS>Apache/1.3.27 Server at www.example.com Port
80</ADDRESS>
</BODY></HTML>

Either the docs are wrong or the implementation has a
really long standing bug or I am missing something.

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