feat(handler): implement duplicate read closer for request body

[ch3nnn]

This change introduces a utility function dupReadCloser that allows duplicating the incoming request body reader. It is now used in the request handling loop to ensure that the request body can be consumed by multiple handlers or middleware without losing the original data.

[coveralls]

Pull Request Test Coverage Report for Build 10055591097

Details

• 14 of 17 (82.35%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 91.146%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
handler.go	14	17	82.35%

Totals
Change from base Build 10029513275:	-0.2%
Covered Lines:	803
Relevant Lines:	881

---

💛 - Coveralls

[earthboundkid]

This is a useful feature, but it should not be on by default because it uses too much memory. Instead I think it should look like:

handler := requests.KeepResponseBody(
 	requests.ToJSON(&common),
 	requests.ToJSON(&book),
 	requests.ToString(&str),
 )

What do you think of that?

[ch3nnn]

This is a useful feature, but it should not be on by default because it uses too much memory. Instead I think it should look like:

handler := requests.KeepResponseBody(
 	requests.ToJSON(&common),
 	requests.ToJSON(&book),
 	requests.ToString(&str),
 )

What do you think of that?

i think KeepRespBodyHandlers more suitable.
help to review new commit. thank!

[earthboundkid]

I'm not sure, but I think if one of the handlers only consumed part of the response, the subsequent handlers would only get a partial buffer.

Instead, what if on a new line between line 35 and line 36, it read the whole body into a buffer and reset the buffer on each loop?