How to use the API to query the comments which created by 'issue template'

As the title described , I have created a issue by the ‘default issue template’, Same time, there is a comments. I am try to query it. but it is failed.

I fond the normal issue comments will have different URLs .
https://github.ibm.com/XXX/mytest/issues/1#issue-15426648
https://github.ibm.com/XX/mytest/issues/1#issuecomment-23564833

it is my fault. it is a kind of issue instead of issue comment. we could to query the body to get the content. Thanks