[1] interagent/http-api-design ( (2014-05-30 01:49:47 +09:00 版)) <https://github.com/interagent/http-api-design>
[2] Platform API Reference | Heroku Dev Center ( (2014-10-08 12:32:11 +09:00 版)) <https://devcenter.heroku.com/articles/platform-api-reference#request-id>
Each API response contains a unique request id in the Request-Id header to facilitate tracking. When reporting issues, providing this value makes it easier to pinpoint problems and provide solutions more quickly.
Each API request has an associated request identifier. You can find this in the response headers, under Request-Id.
Include a Request-Id header in each API response, populated with a UUID value. By logging these values on the client, server and any backing services, it provides a mechanism to trace, diagnose and debug requests.