Getting unexpected error code 0/null/100

[priyabratap]

Hi, Thanks for this great library.

We have added some code curl_getinfo($ch, CURLINFO_HTTP_CODE) to get an exact error code from firebase. Sometimes, we are getting some unexpected error code 0 / null / 100.

Could you please help me to understand the reason behind such an error code?

Note: As per firebase documentation, it never returns such error code.