curl    -H "Date: Mon Jun  6 13:50:50 ART 2016" \
        -H "Authorization: oi2u987c89qwkhje2k1" \
        -H "Content-Type: application/json" \
        "127.0.0.1:9001?do=api"

===

curl -X POST \
    --header 'Content-Type: application/json' \
    --header 'Accept: application/json' \
    -d '{ "client_id": 1 }' \
    'http://api.site.com/categories'