odoo多worker下报总线不可用错误

odoo在开启多worker时，如果nginx没有配置/longpull，会报如下错误：

web.assets_common.js:3556 Server application error
 Error code: 200 
 Error message: Odoo Server Error 
 Error data message:
 bus.Bus unavailable 
 Error data debug:
 Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 656, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 314, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/usr/lib/python3/dist-packages/odoo/tools/pycompat.py", line 87, in reraise
    raise value
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 698, in dispatch
    result = self._call_function(**self.params)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 346, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 339, in checked_call
    result = self.endpoint(*a, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 941, in __call__
    return self.method(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 519, in response_wrap
    response = f(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/addons/bus/controllers/main.py", line 37, in poll
    raise Exception("bus.Bus unavailable")
Exception: bus.Bus unavailable

解决方案就是在nginx中添加：

location /longpolling/ {  
    proxy_pass        http://127.0.0.1:8072/longpolling/;  
    proxy_redirect    off;  
    proxy_set_header  X-Real-IP        $remote_addr;  
    proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;  
}