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This module implements WSGI related helpers adapted from ``werkzeug.wsgi``
:copyright: (c) 2010 by the Werkzeug Team, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
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Returns only proper HTTP headers.
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Returns our whitelisted environment variables.
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� r� | d k r� | d } n | S( s� Return the real host for the given WSGI environment. This takes care
of the `X-Forwarded-Host` header.
:param environ: the WSGI environment to get the host of.
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c C@ s� | d d t | � g } | j } | r9 d j | � d S| t | j d d � j d � � � | rq | d � nX | t d | j d d � j d � � � | s� | j d � } | r� | d | � q� n d j | � S( s3 A handy helper function that recreates the full URL for the current
request or parts of it. Here an example:
>>> from werkzeug import create_environ
>>> env = create_environ("/?param=foo", "http://localhost/script")
>>> get_current_url(env)
'http://localhost/script/?param=foo'
>>> get_current_url(env, root_only=True)
'http://localhost/script/'
>>> get_current_url(env, host_only=True)
'http://localhost/'
>>> get_current_url(env, strip_querystring=True)
'http://localhost/script/'
:param environ: the WSGI environment to get the current URL from.
:param root_only: set `True` if you only want the root URL.
:param strip_querystring: set to `True` if you don't want the querystring.
:param host_only: set to `True` if the host URL should be returned.
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Naively yank the first IP address in an X-Forwarded-For header
and assume this is correct.
Note: Don't use this in security sensitive situations since this
value may be forged from a client.
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