Log file not updating on dev-info page

[tim-devel]

Make sure you are running the latest version of Home Assistant before reporting an issue.

You should only file an issue if you found a bug. Feature and enhancement requests should go in the Feature Requests section of our community forum:

Home Assistant release (hass --version):
0.32.2

Python release (python3 --version):
3.4.2

Component/platform:
dev-info page.

Description of problem:
home-assistant.log is not being displayed on the dev-info page correctly. The contents of the home-assistant.log file is showing the correct content. But after three restarts and full reboot and manually deleting the home-assistant.log file the front end is still displaying log entries from a previous session. The date and time of the log being shown in the front end coincides with the first time I restarted home assistant while running with 32.2.

Expected:
Correct error log should be shown in front end

Problem-relevant configuration.yaml entries and steps to reproduce:

Contents of home-assistant.log

16-11-08 09:03:00 homeassistant.components.climate.generic_thermostat: Unable to update from sensor: could not convert string to float: 'unknown'
16-11-08 09:03:00 homeassistant.components.climate.generic_thermostat: Unable to update from sensor: could not convert string to float: 'unknown'

Error log displayed in front end:

16-11-07 20:01:29 homeassistant.components.climate.generic_thermostat: Unable to update from sensor: could not convert string to float: 'unknown'
16-11-07 20:01:29 homeassistant.components.climate.generic_thermostat: Unable to update from sensor: could not convert string to float: 'unknown'
16-11-07 20:19:01 homeassistant.helpers.entity: Updating state for sensor.back_room_temp_update_timer took 0.547 seconds. Please report platform to the developers at https://goo.gl/Nvioub
16-11-07 22:11:01 homeassistant.helpers.entity: Updating state for sensor.front_room_temp_update_timer took 0.546 seconds. Please report platform to the developers at https://goo.gl/Nvioub
16-11-07 23:23:01 homeassistant.helpers.entity: Updating state for sensor.back_room_temp_update_timer took 0.543 seconds. Please report platform to the developers at https://goo.gl/Nvioub
16-11-07 23:34:01 homeassistant.helpers.entity: Updating state for sensor.weather_icon took 0.550 seconds. Please report platform to the developers at https://goo.gl/Nvioub
16-11-08 01:48:01 homeassistant.helpers.entity: Updating state for sensor.front_room_temp_update_timer took 0.555 seconds. Please report platform to the developers at https://goo.gl/Nvioub
16-11-08 01:54:01 homeassistant.helpers.entity: Updating state for sensor.transmission_status took 0.535 seconds. Please report platform to the developers at https://goo.gl/Nvioub
16-11-08 02:17:22 pychromecast.socket_client: Heartbeat timeout, resetting connection
16-11-08 02:17:23 pychromecast.socket_client: Failed to connect, retrying in 5.000000s
Traceback (most recent call last):
  File "/home/pi/.homeassistant/deps/pychromecast/socket_client.py", line 239, in initialize_connection
    self.socket.connect((self.host, self.port))
  File "/usr/lib/python3.4/ssl.py", line 840, in connect
    self._real_connect(addr, False)
  File "/usr/lib/python3.4/ssl.py", line 827, in _real_connect
    socket.connect(self, addr)
ConnectionRefusedError: [Errno 111] Connection refused
16-11-08 03:02:04 homeassistant.components.switch.orvibo: Error while fetching S20 state
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/homeassistant/components/switch/orvibo.py", line 91, in update
    self._state = self._s20.on
  File "/home/pi/.homeassistant/deps/orvibo/s20.py", line 154, in on
    return self._subscribe()
  File "/home/pi/.homeassistant/deps/orvibo/s20.py", line 206, in _subscribe
    "No status could be found for {}".format(self.host))
orvibo.s20.S20Exception: No status could be found for 192.168.0.21
16-11-08 03:03:33 homeassistant.components.switch.orvibo: Error while fetching S20 state
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/homeassistant/components/switch/orvibo.py", line 91, in update
    self._state = self._s20.on
  File "/home/pi/.homeassistant/deps/orvibo/s20.py", line 154, in on
    return self._subscribe()
  File "/home/pi/.homeassistant/deps/orvibo/s20.py", line 206, in _subscribe
    "No status could be found for {}".format(self.host))
orvibo.s20.S20Exception: No status could be found for 192.168.0.21

Traceback (if applicable):

Additional info:

[pvizeli]

Delete the log file and make a reboot.

[lukasmrtvy]

Deleting and rebooting does not help, at least in docker version

[tim-devel]

I have also tried deleting and rebooting and it didn't work

[radeonorama]

Same issue here running on windows with Python 3.5.2

Edit: must be some sort of caching issue as switching to a browser that's never loaded HA shows the correct log.

[Molodax]

I'd like to confirm the same issue with my HASS running on Windows in different browsers (Chrome desktop and mobile), Edge.

[arraylabs]

Clearing the browser cache will show the same contents as the .log file. Just ran into this issue earlier. With that said I have never had to clear the browser cache with version < .32 in the past.

[Chris-V]

As mentioned by @arraylabs, doing a hard refresh (ctrl + shift + r) will show the appropriate content. When inspecting the responses from HASS in chrome, I can see this header:

Cache-Control:public, max-age=2678400

I reconfigured my nginx to strip it away and now everything is fresh when I request it. I don't know where the cache is configured in home assistant, but imo it should not include anything under /api. Or event better, make it Cache-Control: private.

Edit: Found that https://github.com/home-assistant/home-assistant/blob/dev/homeassistant/components/http.py#L202-L206 which comes from #3914