django websocket流式应答

Django中可以使用channels库来实现websocket的流式应答。具体步骤如下：

1. 安装channels库：`pip install channels`

2. 在Django项目的settings.py文件中添加以下配置：

   INSTALLED_APPS = [
       # ...
       'channels',
   ]
   
   CHANNEL_LAYERS = {
       "default": {
           "BACKEND": "channels.layers.InMemoryChannelLayer"
       }
   }

3. 创建一个consumer来处理websocket连接：

   from channels.generic.websocket import AsyncWebsocketConsumer
   import json
   
   class MyConsumer(AsyncWebsocketConsumer):
       async def connect(self):
           await self.accept()
   
       async def disconnect(self, close_code):
           pass
   
       async def receive(self, text_data):
           text_data_json = json.loads(text_data)
           message = text_data_json['message']
   
           await self.send(text_data=json.dumps({
               'message': message
           }))

4. 在项目的routing.py文件中添加路由：

   from django.urls import re_path
   from . import consumers
   
   websocket_urlpatterns = [
       re_path(r'ws/my_consumer/$', consumers.MyConsumer.as_asgi()),
   ]
   
   application = ProtocolTypeRouter({
       "websocket": URLRouter(
           websocket_urlpatterns
       ),
   })

5. 在前端页面中使用JavaScript来连接websocket：

   var socket = new WebSocket('ws://' + window.location.host + '/ws/my_consumer/');
   
   socket.onmessage = function(e) {
       var data = JSON.parse(e.data);
       console.log(data.message);
   }
   
   socket.onopen = function(e) {
       socket.send(JSON.stringify({
           'message': 'Hello, world!'
       }));
   }