Sources

1. Mahesh Haldar: RESTful API Designing guidelines — The best practices (https://hackernoon.com/restful-api-designing-guidelines-the-best-practices-60e1d954e7c9, 2017-08-10

2. Vinay Sahni: Best Practices for Designing a Pragmatic RESTful API (http://www.vinaysahni.com/best-practices-for-a-pragmatic-restful-api), 2017-08-16

3. Zalando guides for API development (http://zalando.github.io/restful-api-guidelines/http/Http.html), 2017-08-15

4. White House Web API Standards (https://github.com/WhiteHouse/api-standards/blob/master/README.md#error-handling), 2017-08-15

5. Restivus Swagger (https://github.com/apinf/restivus-swagger), 2017-08-16

6. Wikipedia: List of HTTP status codes (https://en.wikipedia.org/wiki/List_of_HTTP_status_codes\, 2017-08-21

7. OpenAPI documentation (https://swagger.io/\), 2017-11-03