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Proposal for minor spec changes (#554)

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* Webserver -> web server

This was flagged by my spell check, and indeed it's hard to find
spellings online without the space. The Oxford Dictionary only knows it
with a space, so I thought it's worth correcting.

* Attempt to clarify optional keys

I wasn't sure about how to treat keys marked optional. After having
spoken to Andrew, this is my attempt at clarifying. Improvements
welcome!

* Order of header values MUST be kept

Order for HTTP header values matters, both in request and responses. So
we must make sure that we're keeping it.

Request:
> Some headers, such as Accept-Language can be sent by clients as
> several headers each with a different value rather than sending the
> header as a comma separated list.

http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#getHeaders%28java.lang.String%29

Response:
Set-Cookie may be present multiple times, and only the last given value
is to be used.

I'm updating the Daphne test to verify the order in my pull request
there.

* Clarify that headers is a list of lists

The wording for 'server'/'client' and 'headers' was very similar, and I
was unsure if clients may be a list of lists (in anticipation of
protocols supporting that). I hope this small tweak makes it clearer
that only headers is a list of lists.
This commit is contained in:
Maik Hoepfel 2017-03-08 01:05:28 -06:00 committed by Andrew Godwin
parent 2101f285cb
commit 13c1fcb654
1 changed files with 11 additions and 9 deletions
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20
docs/asgi.rst
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@ -9,7 +9,7 @@ Abstract
======== ========
This document proposes a standard interface between network protocol This document proposes a standard interface between network protocol
servers (particularly webservers) and Python applications, intended servers (particularly web servers) and Python applications, intended
to allow handling of multiple common protocol styles (including HTTP, HTTP2, to allow handling of multiple common protocol styles (including HTTP, HTTP2,
and WebSocket). and WebSocket).
@ -22,7 +22,7 @@ Rationale
========= =========
The WSGI specification has worked well since it was introduced, and The WSGI specification has worked well since it was introduced, and
allowed for great flexibility in Python framework and webserver choice. allowed for great flexibility in Python framework and web server choice.
However, its design is irrevocably tied to the HTTP-style However, its design is irrevocably tied to the HTTP-style
request/response cycle, and more and more protocols are becoming a request/response cycle, and more and more protocols are becoming a
standard part of web programming that do not follow this pattern standard part of web programming that do not follow this pattern
@ -478,8 +478,9 @@ Message Formats
These describe the standardized message formats for the protocols this These describe the standardized message formats for the protocols this
specification supports. All messages are ``dicts`` at the top level, specification supports. All messages are ``dicts`` at the top level,
and all keys are required unless otherwise specified (with a default to and all keys are required unless explicitly marked as optional. If a key is
use if the key is missing). Keys are unicode strings. marked optional, a default value is specified, which is to be assumed if
the key is missing. Keys are unicode strings.
The one common key across all protocols is ``reply_channel``, a way to indicate The one common key across all protocols is ``reply_channel``, a way to indicate
the client-specific channel to send responses to. Protocols are generally the client-specific channel to send responses to. Protocols are generally
@ -557,10 +558,11 @@ Keys:
is mounted at; same as ``SCRIPT_NAME`` in WSGI. Optional, defaults is mounted at; same as ``SCRIPT_NAME`` in WSGI. Optional, defaults
to ``""``. to ``""``.
* ``headers``: A list of ``[name, value]`` pairs, where ``name`` is the * ``headers``: A list of ``[name, value]`` lists, where ``name`` is the
byte string header name, and ``value`` is the byte string byte string header name, and ``value`` is the byte string
header value. Order should be preserved from the original HTTP request; header value. Order of header values must be preserved from the original HTTP
duplicates are possible and must be preserved in the message as received. request; order of header names is not important. Duplicates are possible and
must be preserved in the message as received.
Header names must be lowercased. Header names must be lowercased.
* ``body``: Body of the request, as a byte string. Optional, defaults to ``""``. * ``body``: Body of the request, as a byte string. Optional, defaults to ``""``.
@ -622,9 +624,9 @@ Keys:
* ``status``: Integer HTTP status code. * ``status``: Integer HTTP status code.
* ``headers``: A list of ``[name, value]`` pairs, where ``name`` is the * ``headers``: A list of ``[name, value]`` lists, where ``name`` is the
byte string header name, and ``value`` is the byte string byte string header name, and ``value`` is the byte string
header value. Order should be preserved in the HTTP response. Header names header value. Order must be preserved in the HTTP response. Header names
must be lowercased. must be lowercased.
* ``content``: Byte string of HTTP body content. * ``content``: Byte string of HTTP body content.