We kindly recommend that if you use Public web location to send HTTP request always make it through HTTPS
Home address for all requests is always:
https://connect.agtravelsoft.rs/api/
That means, if you send GET request to collect data about countries you need to send to:
https://connect.agtravelsoft.rs/api/Countries

DateTime format in each http request is always: dd.MM.yyyy
That means, if your date is July 21st 2019, your date have to be in the format: 21.07.2019
Date format is always same. Every time when you specify date time parameter in URL (like a QueryString parameter) or like a value in some of JSON formated object in the body of the HTTP requst - use dd.MM.yyy DateTime format

What is response format for each of our APIs, please take a look "Response Formats" area in selected Api sample

Home URL for all images is:
https://media.agtravelsoft.rs/public/images/objects/

That means, if data from our API are:

Your Image src atribute need to be:
https://media.agtravelsoft.rs/public/images/objects/image-name-city.jpg