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The HTTP specs are quite clear.

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Cory Benfield 2016-03-10 09:43:05 +00:00
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docs/asgi.rst
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@ -413,11 +413,17 @@ main response, and you should check for ``http_version = 2`` before sending
them; if a protocol server or connection incapable of Server Push receives
these, it should simply drop them.
The HTTP specs are somewhat vague on the subject of multiple headers;
RFC7230 explicitly says they must be merge-able with commas, while RFC6265
says that ``Set-Cookie`` headers cannot be combined this way. This is why
request ``headers`` is a ``dict``, and response ``headers`` is a list of
tuples, which matches WSGI.
Multiple header fields with the same name are complex in HTTP. RFC 7230
states that for any header field that can appear multiple times, it is exactly
equivalent to sending that header field only once with all the values joined by
commas.
However, RFC 7230 and RFC 6265 make it clear that this rule does not apply to
the various headers used by HTTP cookies (``Cookie`` and ``Set-Cookie``). The
``Cookie`` header must only be sent once by a user-agent, but the
``Set-Cookie`` header may appear repeatedly and cannot be joined by commas.
For this reason, we can safely make the request ``headers`` a ``dict``, but
the response ``headers`` must be sent as a list of tuples, which matches WSGI.
Request
'''''''