Błędy
Format błędów zwracanych przez API
4xx|500
<error id="1000">
  <message>Invalid login or password</message>
</error>

Lista możliwych błędów:

404
Not found
403
Forbidden
500
Server error - something unexpected happened
1000
Invalid login or password
1001
Queue does not exist
1002
There is no recently popped data
1003
Invalid eLibri ONIX dialect in header X-eLibri-API-ONIX-dialect. Possible values: 3.0.1