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> http://python.org/sf/549151

the analyzation of the browsers is right. lynx is best ok to
ask.
But urllibX is not a browser (application) but a lib: As of
now with standard urllibX error handling you cannot code a lynx.

gvr's initial suggestion to raise a clear error (with
redirection-link as attribute of the exception value) is
best ok. Another option would be to simly yield the
undirected stub HTML and leave the 30X-code (and redirection
LOCATION in header).

To redirect POST as GET _while_ simply loosing (!) the data
(and not appending it to the GET-URL) is most bad for a lib.
Transcribing smart a short formlike POST to a GET w QUERY
would be so la la.
Don't know if the MS & netscape's also transpose to GET with
long data? ...

The current behaviour is most worst of all 4. All other
methods whould at least have raisen an early hint/error in
my case.