Problem accessing a web page

Antoni Mont amontfes at yahoo.es
Mon Dec 15 22:31:39 CET 2008


Tim Chase wrote:

> When you get the second page, are you getting the same content
> back that you get if you do a search in your favorite browser?
> 
> Using just
> 
>    content = urllib.urlopen(url2).read()
>    'Error' in content # True
>    'Friedrich' in content # False
> 
> However, when you browse to the page, those two should be inverted:
> 
>    'Error' in content # False
>    'Friedrich' in content # True
> 
> I've tried adding in the parameters correctly via post
> 
>    params = urllib.urlencode([
>      ('params.forzaQuery', 'N'),
> ...
>      ('layout', 'busquedaisbn'),
>      ])
>    content = urllib.urlopen(url2, data).read()
> 
> However, this too fails because the underlying engine expects a
> session ID in the URL.  I finally got it to work with the code below:
> 
>    import urllib
> 
>    data = [
>      ('params.forzaQuery', 'N'),
>      ('params.cdispo', 'A'),
>      ('params.cisbnExt', '8484031128'),
>      ('params.liConceptosExt[0].texto', ''),
>      ('params.orderByFormId', '1'),
>      ('action', 'Buscar'),
>      ('language', 'es'),
>      ('prev_layout', 'busquedaisbn'),
>      ('layout', 'busquedaisbn'),
>      ]
> 
>    params = urllib.urlencode(data)
> 
>    url =
> 'http://www.mcu.es/webISBN/tituloSimpleDispatch.do;jsessionid=5E8D9A11E4A28BDF0BA6B254D0118262'
> 
>    fp = urllib.urlopen(url, params)
>    content = fp.read()
>    fp.close()
> 
> 
> but I had to hard-code the jsessionid parameter in the URL.  This
> would have to be determined from the initial call & response of
> the initial URL (the initial URL returns a <FORM> element with
> the URL to POST to, including this magic jsessionid parameter).
> 
> Hope this helps nudge you (the OP) in the right direction to get
> what you're looking for.
> 
> -tkc
> 
> 
> 
> 
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list

OK, Tim, I think you got the point. The jsessionid change in every
response of the initial URL, so I need to read it and stand with it
during the session. Now I must guess how to do it.

Thank you very much to you and also to Chris.
Kind regards,
Toni 




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