Proxy: Fix resource leak in ParseBody. v8.0.26

[sevico]

Problem

ParseBody in internal/utils/utils.go defers r.Close() only after io.ReadAll(r) succeeds. If io.ReadAll returns an error, the function returns before registering the deferred close, so the request/body reader is left open.

func ParseBody(r io.ReadCloser, v interface{}) error {
    b, err := io.ReadAll(r)
    if err != nil {
        return errors.Wrapf(err, "read body") // r is not closed on this path
    }
    defer r.Close()

Solution

Move defer r.Close() to the top of ParseBody, before reading the body, so all return paths close the reader.

func ParseBody(r io.ReadCloser, v interface{}) error {
    defer r.Close()

    b, err := io.ReadAll(r)

[suzp1984]

I rebased your branch to develop branch.
And this commit make sense.

[suzp1984]

One more thing, I added UT to cover this PR.