Can't Connect to Mosh on macOS

[redreceipt]

macOS by default accepts locale info, I know because mosh works fine with Blink.sh for iOS. But even with this chrome extension supposedly sending UTF-8, something isn't working properly. I get this error:

Bad response when running mosh-server: 'mosh-server needs a UTF-8 native locale to run.

Unfortunately, the local environment ([no charset variables]) specifies
the character set "US-ASCII",

The client-supplied environment ([no charset variables]) specifies
the character set "US-ASCII".

LANG=""

LC_COLLATE="C"

LC_CTYPE="C"

LC_MESSAGES="C"

LC_MONETARY="C"

LC_NUMERIC="C"

LC_TIME="C"

LC_ALL=

'

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