11.22.6 ProtocolError Objects 
A ProtocolError object describes a protocol error in the
underlying transport layer (such as a 404 `not found' error if the
server named by the URI does not exist).  It has the following
members:
- url
- 
The URI or URL that triggered the error.
- errcode
- 
The error code.
- errmsg
- 
The error message or diagnostic string.
- headers
- 
A string containing the headers of the HTTP/HTTPS request that
triggered the error.
Release 2.4.3, documentation updated on 29 March 2006.
 
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