API path

[ubunturtu]

my actual API root path is some URL which I entered in the datasource config page and tested ok
now when i choose JSON API datasource - I put the endpoint as example
ds/api/v1/datasource-nodes/46dc2c03-524e-4c36-ad6f-57ba108daf98/tags
however, when i go to network tab i see the following:
http://localhost:3000/api/datasources/proxy/1/ds/api/v1/datasource-nodes/46dc2c03-524e-4c36-ad6f-57ba108daf98/tags
i get 404 not found error message
postman works fine
i assumed the API would call the actual external API server which was some URL/ds/api/v1/datasource-nodes/46dc2c03-524e-4c36-ad6f-57ba108daf98/tags but instead it appended it to the grafana server on my localhost

what am i doing wrong, can somebody please help