curl --location --request POST 'http://dev-cn.your-api-server.com/v1/sources/add-url' \
--header 'x-api-key: sec_xxxxxx' \
--header 'Content-Type: application/json' \
--data-raw '{"url": "https://uscode.house.gov/static/constitution.pdf"}'
{ "sourceId": "src_xxxxxx" }