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HTTP Message Header Fields (see RFC 4229)

This contains general support for HTTP/1.1 message headers [1]_ in a
manner that supports WSGI ``environ`` [2]_ and ``response_headers``
[3]_. Specifically, this module defines a ``HTTPHeader`` class whose
instances correspond to field-name items.  The actual field-content for
the message-header is stored in the appropriate WSGI collection (either
the ``environ`` for requests, or ``response_headers`` for responses).

Each ``HTTPHeader`` instance is a callable (defining ``__call__``)
that takes one of the following:

  - an ``environ`` dictionary, returning the corresponding header
    value by according to the WSGI's ``HTTP_`` prefix mechanism, e.g.,
    ``USER_AGENT(environ)`` returns ``environ.get('HTTP_USER_AGENT')``

  - a ``response_headers`` list, giving a comma-delimited string for
    each corresponding ``header_value`` tuple entries (see below).

  - a sequence of string ``*args`` that are comma-delimited into
    a single string value: ``CONTENT_TYPE("text/html","text/plain")``
    returns ``"text/html, text/plain"``

  - a set of ``**kwargs`` keyword arguments that are used to create
    a header value, in a manner dependent upon the particular header in
    question (to make value construction easier and error-free):
    ``CONTENT_DISPOSITION(max_age=CONTENT_DISPOSITION.ONEWEEK)``
    returns ``"public, max-age=60480"``

Each ``HTTPHeader`` instance also provides several methods to act on
a WSGI collection, for removing and setting header values.

  ``delete(collection)``

    This method removes all entries of the corresponding header from
    the given collection (``environ`` or ``response_headers``), e.g.,
    ``USER_AGENT.delete(environ)`` deletes the 'HTTP_USER_AGENT' entry
    from the ``environ``.

  ``update(collection, *args, **kwargs)``

    This method does an in-place replacement of the given header entry,
    for example: ``CONTENT_LENGTH(response_headers,len(body))``

    The first argument is a valid ``environ`` dictionary or
    ``response_headers`` list; remaining arguments are passed on to
    ``__call__(*args, **kwargs)`` for value construction.

  ``apply(collection, **kwargs)``

    This method is similar to update, only that it may affect other
    headers.  For example, according to recommendations in RFC 2616,
    certain Cache-Control configurations should also set the
    ``Expires`` header for HTTP/1.0 clients. By default, ``apply()``
    is simply ``update()`` but limited to keyword arguments.

This particular approach to managing headers within a WSGI collection
has several advantages:

  1. Typos in the header name are easily detected since they become a
     ``NameError`` when executed.  The approach of using header strings
     directly can be problematic; for example, the following should
     return ``None`` : ``environ.get("HTTP_ACCEPT_LANGUAGES")``

  2. For specific headers with validation, using ``__call__`` will
     result in an automatic header value check.  For example, the
     _ContentDisposition header will reject a value having ``maxage``
     or ``max_age`` (the appropriate parameter is ``max-age`` ).

  3. When appending/replacing headers, the field-name has the suggested
     RFC capitalization (e.g. ``Content-Type`` or ``ETag``) for
     user-agents that incorrectly use case-sensitive matches.

  4. Some headers (such as ``Content-Type``) are 0, that is,
     only one entry of this type may occur in a given set of
     ``response_headers``.  This module knows about those cases and
     enforces this cardinality constraint.

  5. The exact details of WSGI header management are abstracted so
     the programmer need not worry about operational differences
     between ``environ`` dictionary or ``response_headers`` list.

  6. Sorting of ``HTTPHeaders`` is done following the RFC suggestion
     that general-headers come first, followed by request and response
     headers, and finishing with entity-headers.

  7. Special care is given to exceptional cases such as Set-Cookie
     which violates the RFC's recommendation about combining header
     content into a single entry using comma separation.

A particular difficulty with HTTP message headers is a categorization
of sorts as described in section 4.2:

    Multiple message-header fields with the same field-name MAY be
    present in a message if and only if the entire field-value for
    that header field is defined as a comma-separated list [i.e.,
    #(values)]. It MUST be possible to combine the multiple header
    fields into one "field-name: field-value" pair, without changing
    the semantics of the message, by appending each subsequent
    field-value to the first, each separated by a comma.

This creates three fundamentally different kinds of headers:

  - Those that do not have a #(values) production, and hence are
    singular and may only occur once in a set of response fields;
    this case is handled by the ``_SingleValueHeader`` subclass.

  - Those which have the #(values) production and follow the
    combining rule outlined above; our ``_MultiValueHeader`` case.

  - Those which are multi-valued, but cannot be combined (such as the
    ``Set-Cookie`` header due to its ``Expires`` parameter); or where
    combining them into a single header entry would cause common
    user-agents to fail (``WWW-Authenticate``, ``Warning``) since
    they fail to handle dates even when properly quoted. This case
    is handled by ``_MultiEntryHeader``.

Since this project does not have time to provide rigorous support
and validation for all headers, it does a basic construction of
headers listed in RFC 2616 (plus a few others) so that they can
be obtained by simply doing ``from paste.httpheaders import *``;
the name of the header instance is the "common name" less any
dashes to give CamelCase style names.

.. [1] http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
.. [2] http://www.python.org/peps/pep-0333.html#environ-variables
.. [3] http://www.python.org/peps/pep-0333.html#the-start-response-callable

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    Member variables (and correspondingly constructor arguments).

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       ``__str__``

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