When calling `base64 <<< username:password` I get this result: `dXNlcm5hbWU6cGFzc3dvcmQK`.

When using that result in PostMan and issuing a request against a Basic Auth endpoint, I get back a 401.

When encoding `username:password` at <https://www.base64encode.org>, I get back this result: `dXNlcm5hbWU6cGFzc3dvcmQ=` and I can successfully use it against the Basic Auth endpoint from above.

If I use PostMan to generate the Basic Auth header passing in `username` and `password`, it generates the same base64 encoded string as <https://www.base64encode.org>.
I could also copy `username:password` into `testin.txt` and use `openssl` to create the base64 string:

`openssl base64 -in testin.txt -out testout.txt` returns `dXNlcm5hbWU6cGFzc3dvcmQK` which is the same wrong result as `base64` creates.

`openssl version` returns `OpenSSL 0.9.8zh 14 Jan 2016`