ResetBody HTTP request body and GetBody same object，is not the http specification

[NameHaibinZhang]

Describe the bug

func (r *Request) ResetBody() {
body, err := r.getNextRequestBody()
if err != nil {
r.Error = awserr.New(ErrCodeSerialization,
"failed to reset request body", err)
return
}

r.HTTPRequest.Body = body
r.HTTPRequest.GetBody = r.getNextRequestBody

}

why set http requet body and GetBody same object，is not the http request GetBody specification

// GetBody defines an optional func to return a new copy of
// Body. It is used for client requests when a redirect requires
// reading the body more than once. Use of GetBody still
// requires setting Body.
//
// For server requests, it is unused.
GetBody func() (io.ReadCloser, error)

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

GetBody Can Read repeatedly

Current Behavior

requestBody, err := req.HTTPRequest.GetBody()
if err != nil {

}
defer requestBody.Close()
requestData, err := io.ReadAll(requestBody)
if err != nil {

}

read the GetBody，the http body buf will to be nil

Reproduction Steps

func TestRequest_FollowPUTRedirects(t *testing.T) {
const bodySize = 9

redirectHit := 0
endpointHit := 0

server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	switch r.URL.Path {
	case "/redirect-me":
		u := *r.URL
		u.Path = "/endpoint"
		w.Header().Set("Location", u.String())
		fmt.Println(r.ContentLength)
		w.WriteHeader(307)
		redirectHit++
	case "/endpoint":
		fmt.Println("xxxxx")
		b := bytes.Buffer{}
		io.Copy(&b, r.Body)
		r.Body.Close()
		fmt.Println("body size", b.Len())
		if e, a := bodySize, b.Len(); e != a {
			t.Fatalf("expect %d body size, got %d", e, a)
		}
		endpointHit++
	default:
		t.Fatalf("unexpected endpoint used, %q", r.URL.String())
	}
}))
defer server.Close()

svc := awstesting.NewClient(&aws.Config{
	Region:     unit.Session.Config.Region,
	DisableSSL: aws.Bool(true),
	Endpoint:   aws.String(server.URL),
})

req := svc.NewRequest(&request.Operation{
	Name:       "Operation",
	HTTPMethod: "PUT",
	HTTPPath:   "/endpoint",
}, &struct{}{}, &struct{}{})
var xx = "111111111"
req.HTTPRequest.ContentLength = int64(len(xx))
req.SetReaderBody(bytes.NewReader([]byte(xx)))

requestBody, err := req.HTTPRequest.GetBody()
if err != nil {

}
defer requestBody.Close()
requestData, err := io.ReadAll(requestBody)
if err != nil {

}

fmt.Println("request data", string(requestData))

/*requestBody1, err := req.HTTPRequest.GetBody()
if err != nil {

}
defer requestBody1.Close()
requestData1, err := io.ReadAll(requestBody1)
if err != nil {

}

fmt.Println("request data1", string(requestData1))*/
fmt.Println(req.HTTPRequest.ContentLength)
err = req.Send()
if err != nil {
	t.Errorf("expect no error, got %v", err)
}
/*if e, a := 1, redirectHit; e != a {
	t.Errorf("expect %d redirect hits, got %d", e, a)
}*/
if e, a := 1, endpointHit; e != a {
	t.Errorf("expect %d endpoint hits, got %d", e, a)
}

}

can test this function

Possible Solution

No response

Additional Information/Context

No response

SDK version used

main

Environment details (Version of Go (go version)? OS name and version, etc.)

1.18

[lucix-aws]

#5270

[github-actions]

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