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Date: Wed, 25 Sep 2013 10:14:50 -0500
From: Tim Chase <python.list@tim.thechases.com>
To: python-list@python.org
Subject: Re: Referrer key missing form os.environ dictionary?
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Xref: csiph.com comp.lang.python:54745

On 2013-09-25 18:02, =CE=9D=CE=AF=CE=BA=CE=BF=CF=82 wrote:
> This indeed works now:
>=20
> ref =3D os.environ.get('HTTP_REFERER', '=CE=86=CE=B3=CE=BD=CF=89=CF=83=CF=
=84=CE=BF Ref')
>=20
> but iam wondering why this doesnt work also:
>=20
> ref =3D os.environ('HTTP_REFERER')
>=20
> Shouldnt both work?

No...that calls os.environ.  You likely *mean*

  ref =3D 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 =3D os.environ["HTTP_REFERER"]
  else:
    deal_with_this_situation()

-tkc