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https://github.com/django/daphne

Django Channels HTTP/WebSocket server
https://github.com/django/daphne

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Django Channels HTTP/WebSocket server

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README 

        
daphne

======



.. image:: https://img.shields.io/pypi/v/daphne.svg

    :target: https://pypi.python.org/pypi/daphne



Daphne is a HTTP, HTTP2 and WebSocket protocol server for

`ASGI `_ and

`ASGI-HTTP `_,

developed to power Django Channels.



It supports automatic negotiation of protocols; there's no need for URL

prefixing to determine WebSocket endpoints versus HTTP endpoints.



Running

-------



Simply point Daphne to your ASGI application, and optionally

set a bind address and port (defaults to localhost, port 8000)::



    daphne -b 0.0.0.0 -p 8001 django_project.asgi:application



If you intend to run daphne behind a proxy server you can use UNIX

sockets to communicate between the two::



    daphne -u /tmp/daphne.sock django_project.asgi:application



If daphne is being run inside a process manager, you might

want it to bind to a file descriptor passed down from a parent process.

To achieve this you can use the --fd flag::



    daphne --fd 5 django_project.asgi:application



If you want more control over the port/socket bindings you can fall back to

using `twisted's endpoint description strings

`_

by using the `--endpoint (-e)` flag, which can be used multiple times.

This line would start a SSL server on port 443, assuming that `key.pem` and `crt.pem`

exist in the current directory (requires pyopenssl to be installed)::



    daphne -e ssl:443:privateKey=key.pem:certKey=crt.pem django_project.asgi:application



Endpoints even let you use the ``txacme`` endpoint syntax to get automatic certificates

from Let's Encrypt, which you can read more about at http://txacme.readthedocs.io/en/stable/.



To see all available command line options run daphne with the ``-h`` flag.



HTTP/2 Support

--------------



Daphne supports terminating HTTP/2 connections natively. You'll

need to do a couple of things to get it working, though. First, you need to

make sure you install the Twisted ``http2`` and ``tls`` extras::



    pip install -U "Twisted[tls,http2]"



Next, because all current browsers only support HTTP/2 when using TLS, you will

need to start Daphne with TLS turned on, which can be done using the Twisted endpoint syntax::



    daphne -e ssl:443:privateKey=key.pem:certKey=crt.pem django_project.asgi:application



Alternatively, you can use the ``txacme`` endpoint syntax or anything else that

enables TLS under the hood.



You will also need to be on a system that has **OpenSSL 1.0.2 or greater**; if you are

using Ubuntu, this means you need at least Ubuntu 16.04.



Now, when you start up Daphne, it should tell you this in the log::



    2017-03-18 19:14:02,741 INFO     Starting server at ssl:port=8000:privateKey=privkey.pem:certKey=cert.pem, channel layer django_project.asgi:channel_layer.

    2017-03-18 19:14:02,742 INFO     HTTP/2 support enabled



Then, connect with a browser that supports HTTP/2, and everything should be

working. It's often hard to tell that HTTP/2 is working, as the log Daphne gives you

will be identical (it's HTTP, after all), and most browsers don't make it obvious

in their network inspector windows. There are browser extensions that will let

you know clearly if it's working or not.



Daphne only supports "normal" requests over HTTP/2 at this time; there is not

yet support for extended features like Server Push. It will, however, result in

much faster connections and lower overheads.



If you have a reverse proxy in front of your site to serve static files or

similar, HTTP/2 will only work if that proxy understands and passes through the

connection correctly.



Root Path (SCRIPT_NAME)

-----------------------



In order to set the root path for Daphne, which is the equivalent of the

WSGI ``SCRIPT_NAME`` setting, you have two options:



* Pass a header value ``Daphne-Root-Path``, with the desired root path as a

  URLencoded ASCII value. This header will not be passed down to applications.



* Set the ``--root-path`` commandline option with the desired root path as a

  URLencoded ASCII value.



The header takes precedence if both are set. As with ``SCRIPT_ALIAS``, the value

should start with a slash, but not end with one; for example::



    daphne --root-path=/forum django_project.asgi:application



Python Support

--------------



Daphne requires Python 3.8 or later.



Contributing

------------



Please refer to the

`main Channels contributing docs `_.



To run tests, make sure you have installed the ``tests`` extra with the package::



    cd daphne/

    pip install -e '.[tests]'

    pytest



Maintenance and Security

------------------------



To report security issues, please contact [email protected]. For GPG

signatures and more security process information, see

https://docs.djangoproject.com/en/dev/internals/security/.



To report bugs or request new features, please open a new GitHub issue.



This repository is part of the Channels project. For the shepherd and maintenance team, please see the

`main Channels readme `_.