syncthing: /rest/system/status returns empty response during startup

Syncthing version 0.12.20 (although it’s been around since at least the beginning of February).

During startup, the /rest/system/status endpoint can return an empty response (seems to happen more on some devices than others).

The headers returned are:

  Access-Control-Allow-Origin: *
  Pragma: no-cache
  X-Syncthing-Id: IDIDIID-IDIDID-IDIDID-IDIDID-IDIDID-IDIDID-IDIDID-IDIDID
  X-Syncthing-Version: v0.12.20
  Cache-Control: no-store, no-cache, max-age=0
  Date: Sat, 19 Mar 2016 22:40:58 GMT
  Content-Length: 0
  Content-Type: application/json; charset=utf-8
  Expires: Sat, 19 Mar 2016 22:40:58 GMT

Of particular interest is the Content-Length: 0. I had a quick look through the code but couldn’t see why it might be doing this. I fetch the /rest/system/version resource milliseconds afterwards and that returns the correct data.

Thanks!