# Copyright (c) 2013 Amazon.com, Inc. or its affiliates.  All Rights Reserved
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
import sys
import six
if six.PY3:
    from six.moves import http_client
    class HTTPHeaders(http_client.HTTPMessage):
        pass
else:
    from email.message import Message
    class HTTPHeaders(Message):
        pass


# The unittest module got a significant overhaul
# in 2.7, so if we're in 2.6 we can use the backported
# version unittest2.
if sys.version_info[:2] == (2, 6):
    import unittest2 as unittest
else:
    import unittest

# Copyright (c) 2013 Amazon.com, Inc. or its affiliates.  All Rights Reserved
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
import sys
import six
if six.PY3:
    from six.moves import http_client
    class HTTPHeaders(http_client.HTTPMessage):
        pass

else:
    from email.message import Message
    class HTTPHeaders(Message):

        # The __iter__ method is not available in python2.x, so we have
        # to port the py3 version.
        def __iter__(self):
            for field, value in self._headers:
                yield field

@classmethod
def from_dict(cls, d):
    new_instance = cls()
    for key, value in d.items():
        new_instance[key] = value
    return new_instance

@classmethod
def from_pairs(cls, pairs):
    new_instance = cls()
    for key, value in pairs:
        new_instance[key] = value
    return new_instance

HTTPHeaders.from_dict = from_dict
HTTPHeaders.from_pairs = from_pairs


# The unittest module got a significant overhaul
# in 2.7, so if we're in 2.6 we can use the backported
# version unittest2.
if sys.version_info[:2] == (2, 6):
    import unittest2 as unittest
else:
    import unittest

Add __iter__ to HTTPHeader class