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Groups > comp.lang.python > #54748

Re: Referrer key missing form os.environ dictionary?

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Στις 25/9/2013 6:14 μμ, ο/η Tim Chase έγραψε:
> On 2013-09-25 18:02, Νίκος wrote:
>> This indeed works now:
>>
>> ref = os.environ.get('HTTP_REFERER', 'Άγνωστο Ref')
>>
>> but iam wondering why this doesnt work also:
>>
>> ref = os.environ('HTTP_REFERER')
>>
>> Shouldnt both work?
>
> No...that calls os.environ.  You likely *mean*
>
>    ref = os.environ['HTTP_REFERER']
>
> using square brackets.  However, as previously noted by multiple
> respondents, this header is not guaranteed to be sent by the browser
> for a variety of reasons, so it may not be in the environment
> dictionary at all. Thus you are likely to get KeyError exceptions if
> you don't use .get() unless you wrap it in a check:
>
>    if "HTTP_REFERER" in os.environ:
>      ref = os.environ["HTTP_REFERER"]
>    else:
>      deal_with_this_situation()

Thank you very much for the clarification.
I just wanted to know the differecne between the 2 ways of using the 
HTTP_REFERER.

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Referrer key missing form os.environ dictionary? Νίκος <nikos.gr33k@gmail.com> - 2013-09-25 15:45 +0300
  Re: Referrer key missing form os.environ dictionary? Νίκος <nikos.gr33k@gmail.com> - 2013-09-25 16:14 +0300
  Re: Referrer key missing form os.environ dictionary? Chris “Kwpolska” Warrick <kwpolska@gmail.com> - 2013-09-25 16:01 +0200
    Re: Referrer key missing form os.environ dictionary? Νίκος <nikos.gr33k@gmail.com> - 2013-09-25 17:04 +0300
      Re: Referrer key missing form os.environ dictionary? John Gordon <gordon@panix.com> - 2013-09-25 14:26 +0000
        Re: Referrer key missing form os.environ dictionary? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-25 15:04 +0000
          Re: Referrer key missing form os.environ dictionary? Νίκος <nikos.gr33k@gmail.com> - 2013-09-25 18:16 +0300
            Re: Referrer key missing form os.environ dictionary? Tim Chase <python.list@tim.thechases.com> - 2013-09-25 10:42 -0500
            Re: Referrer key missing form os.environ dictionary? Denis McMahon <denismfmcmahon@gmail.com> - 2013-09-25 21:17 +0000
        Re: Referrer key missing form os.environ dictionary? Ned Batchelder <ned@nedbatchelder.com> - 2013-09-25 11:09 -0400
      Re: Referrer key missing form os.environ dictionary? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-25 14:52 +0000
        Re: Referrer key missing form os.environ dictionary? Νίκος <nikos.gr33k@gmail.com> - 2013-09-25 18:02 +0300
          Re: Referrer key missing form os.environ dictionary? Xaxa Urtiz <urtizvereaxaxa@gmail.com> - 2013-09-25 08:09 -0700
          Re: Referrer key missing form os.environ dictionary? Tim Chase <python.list@tim.thechases.com> - 2013-09-25 10:14 -0500
            Re: Referrer key missing form os.environ dictionary? Νίκος <nikos.gr33k@gmail.com> - 2013-09-25 18:35 +0300
        Re: Referrer key missing form os.environ dictionary? Grant Edwards <invalid@invalid.invalid> - 2013-09-25 15:18 +0000
          Re: Referrer key missing form os.environ dictionary? Νίκος <nikos.gr33k@gmail.com> - 2013-09-25 18:41 +0300
            Re: Referrer key missing form os.environ dictionary? John Gordon <gordon@panix.com> - 2013-09-25 16:27 +0000
            Re: Referrer key missing form os.environ dictionary? Grant Edwards <invalid@invalid.invalid> - 2013-09-25 18:37 +0000
          Re: Referrer key missing form os.environ dictionary? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-26 00:11 +0000
            Re: Referrer key missing form os.environ dictionary? Terry Reedy <tjreedy@udel.edu> - 2013-09-25 21:32 -0400
            Re: Referrer key missing form os.environ dictionary? Chris Angelico <rosuav@gmail.com> - 2013-09-26 13:25 +1000
              Re: Referrer key missing form os.environ dictionary? Grant Edwards <invalid@invalid.invalid> - 2013-09-26 14:16 +0000
            Re: Referrer key missing form os.environ dictionary? Robert Kern <robert.kern@gmail.com> - 2013-09-26 11:15 +0100
            Re: Referrer key missing form os.environ dictionary? Grant Edwards <invalid@invalid.invalid> - 2013-09-26 14:11 +0000
              Re: Referrer key missing form os.environ dictionary? Chris Angelico <rosuav@gmail.com> - 2013-09-27 01:17 +1000
                Re: Referrer key missing form os.environ dictionary? Grant Edwards <invalid@invalid.invalid> - 2013-09-26 23:27 +0000
                Re: Referrer key missing form os.environ dictionary? Chris Angelico <rosuav@gmail.com> - 2013-09-27 16:01 +1000
    Re: Referrer key missing form os.environ dictionary? Νίκος <nikos.gr33k@gmail.com> - 2013-09-25 17:07 +0300
      Re: Referrer key missing form os.environ dictionary? Robert Kern <robert.kern@gmail.com> - 2013-09-25 15:26 +0100
      Re: Referrer key missing form os.environ dictionary? John Gordon <gordon@panix.com> - 2013-09-25 14:30 +0000
      Re: Referrer key missing form os.environ dictionary? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-25 14:46 +0000
      Re: Referrer key missing form os.environ dictionary? Piet van Oostrum <piet@vanoostrum.org> - 2013-09-25 15:59 -0400
  Re: Referrer key missing form os.environ dictionary? John Gordon <gordon@panix.com> - 2013-09-25 14:18 +0000
    Re: Referrer key missing form os.environ dictionary? Tim Chase <python.list@tim.thechases.com> - 2013-09-25 09:58 -0500

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