UnknownError, response_code=400

[karimmorta]

I suggest this is due to the token being nil,
however it maybe helpful to have a more explicit error ?

2020-11-21T21:40:32.537557+00:00 app[web.1]: D, [2020-11-21T21:40:32.537319 #4] DEBUG -- : [d41e1d66-ff94-45d1-a3e3-f597c970db6f] ETHON: performed EASY effective_url=https://exp.host/--/api/v2/push/send response_code=400 return_code=ok total_time=0.370627
2020-11-21T21:40:32.538666+00:00 app[web.1]: D, [2020-11-21T21:40:32.538601 #4] DEBUG -- : [d41e1d66-ff94-45d1-a3e3-f597c970db6f]    (0.9ms)  ROLLBACK
2020-11-21T21:40:32.539024+00:00 app[web.1]: I, [2020-11-21T21:40:32.538960 #4]  INFO -- : [d41e1d66-ff94-45d1-a3e3-f597c970db6f] Completed 500 Internal Server Error in 512ms (ActiveRecord: 8.9ms)
2020-11-21T21:40:32.539642+00:00 app[web.1]: F, [2020-11-21T21:40:32.539587 #4] FATAL -- : [d41e1d66-ff94-45d1-a3e3-f597c970db6f]
2020-11-21T21:40:32.539708+00:00 app[web.1]: F, [2020-11-21T21:40:32.539645 #4] FATAL -- : [d41e1d66-ff94-45d1-a3e3-f597c970db6f] Exponent::Push::UnknownError (Unknown error format: #<Typhoeus::Response:0x000055fad02ead08>):
2020-11-21T21:40:32.539741+00:00 app[web.1]: F, [2020-11-21T21:40:32.539695 #4] FATAL -- : [d41e1d66-ff94-45d1-a3e3-f597c970db6f]
2020-11-21T21:40:32.539789+00:00 app[web.1]: F, [2020-11-21T21:40:32.539745 #4] FATAL -- : [d41e1d66-ff94-45d1-a3e3-f597c970db6f] app/models/booking.rb:168:in `send_booking_notification'