[ python-Bugs-548176 ] urlparse doesn't handle host?bla

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Bugs item #548176, was opened at 2002-04-24 17:36
Message generated for change (Comment added) made by jlgijsbers
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Category: Python Library
Group: Python 2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Markus Demleitner (msdemlei)
Assigned to: Nobody/Anonymous (nobody)
Summary: urlparse doesn't handle host?bla

Initial Comment:
The urlparse module (at least in 2.2 and 2.1, Linux)
doesn't
handle URLs of the form
http://www.maerkischeallgemeine.de?loc_id=49 correctly
-- everything up to the 9 ends up in the host.  I
didn't check the RFC, but in the real world URLs like
this do show up.  urlparse works fine when there's a
trailing slash on the host name:
http://www.maerkischeallgemeine.de/?loc_id=49

Example:
<pre>
>>> import urlparse
>>>
urlparse.urlparse("http://www.maerkischeallgemeine.de/?loc_id=49")
('http', 'www.maerkischeallgemeine.de', '/', '',
'loc_id=49', '')
>>>
urlparse.urlparse("http://www.maerkischeallgemeine.de?loc_id=49")
('http', 'www.maerkischeallgemeine.de?loc_id=49', '',
'', '', '')
</pre>

This has serious implications for urllib, since
urllib.urlopen will fail for URLs like the second one,
and with a pretty mysterious exception ("host not
found") at that.

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>Comment By: Johannes Gijsbers (jlgijsbers)
Date: 2004-10-23 09:03

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Somehow I think I'm missing something. Please check my line
of reasoning:

1. http://foo?bar=baz is a legal URL.
2. urlparse's 'Network location' should be the same as
<authority> from rfc2396.
3. Inside <authority> an unescaped '?' is not allowed.
Rather: <authority> is terminated by the '?'.
4. Currently the 'network location' for http://foo?bar=baz
would be 'foo?bar=baz.
5. If 'network location' should be the same as <authority>,
it should also be terminated by the '?'. 

So shouldn't urlparse.urlsplit('http://foo?bar=baz') return
('http', 'foo', '', '', 'bar=baz', ''), as patch 712317
implements?

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Comment By: Mike Rovner (mrovner)
Date: 2004-01-27 02:13

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According to RFC2396 (ftp://ftp.isi.edu/in-notes/rfc2396.txt) 
absoluteURI (part 3 URI Syntactic Components) can be:
"""
<scheme>://<authority><path>?<query>
each of which, except <scheme>, may be absent from a 
particular URI.
"""
Later on (3.2):
"""
The authority component is preceded by a double slash "//" 
and is terminated by the next slash "/", question-mark "?", 
or by the end of the URI.
"""
So URL "http://server?query" is perfectly legal and shall be 
allowed and patch 712317 rejected.

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Comment By: Steven Taschuk (staschuk)
Date: 2003-03-30 22:19

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For comparison, RFC 1738 section 3.3:
   An HTTP URL takes the form:
      http://&lt;host&gt;:&lt;port&gt;/&lt;path&gt;?&lt;searchpart&gt;
   [...] If neither &lt;path&gt; nor &lt;searchpart&gt; is present,
   the &quot;/&quot; may also be omitted.
... which does not outright say the '/' may *not* be omitted if 
&lt;path&gt; is absent but &lt;searchpart&gt; is present (though imho 
that's implied).

But even if the / may not be omitted in this case, ? is not 
allowed in the authority component under either RFC 2396 or 
RFC 1738, so urlparse should either treat it as a delimiter or 
reject the URL as malformed.  The principle of being lenient in 
what you accept favours the former.

I've just submitted a patch (712317) for this.

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Comment By: Jeff Epler (jepler)
Date: 2002-11-17 17:56

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This actually appears to be permitted by RFC2396
[http://www.ietf.org/rfc/rfc2396.txt].   See section 3.2:


3.2. Authority Component

   Many URI schemes include a top hierarchical element for a
naming authority, such that the namespace defined by the
remainder of the URI is governed by that authority.  This
authority component is typically defined by an
Internet-based server or a scheme-specific registry of
naming authorities.

      authority     = server | reg_name

   The authority component is preceded by a double slash
&quot;//&quot; and is terminated by the next slash &quot;/&quot;, question-mark
&quot;?&quot;, or by the end of the URI.  Within the authority
component, the characters &quot;;&quot;, &quot;:&quot;, &quot;@&quot;, &quot;?&quot;, and &quot;/&quot; are
reserved.

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