Invalid chunk size "" unable to read chunked body

[elfeffe]

I receive this message when I test connection on backend
https://gyazo.com/069a7d1c2b238603bdf8885ebe97b9d2

And the logs says:

Call to https://xxx.zendesk.com/api/v2/users/me.json resulted in: Invalid chunk size "" unable to read chunked body

It works when I test connection using curl -u. It doesn't work in Magento, but works in curl.
I also clear the 2 empty spaces that the API generates (at the begin and at the end, it generates two empty spaces while copy and paste).