feat(sync): full code sync from release

backend/internal/pkg/httputil/body.go

@@ -0,0 +1,37 @@
+package httputil
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+)
+
+const (
+	requestBodyReadInitCap    = 512
+	requestBodyReadMaxInitCap = 1 << 20
+)
+
+// ReadRequestBodyWithPrealloc reads request body with preallocated buffer based on content length.
+func ReadRequestBodyWithPrealloc(req *http.Request) ([]byte, error) {
+	if req == nil || req.Body == nil {
+		return nil, nil
+	}
+
+	capHint := requestBodyReadInitCap
+	if req.ContentLength > 0 {
+		switch {
+		case req.ContentLength < int64(requestBodyReadInitCap):
+			capHint = requestBodyReadInitCap
+		case req.ContentLength > int64(requestBodyReadMaxInitCap):
+			capHint = requestBodyReadMaxInitCap
+		default:
+			capHint = int(req.ContentLength)
+		}
+	}
+
+	buf := bytes.NewBuffer(make([]byte, 0, capHint))
+	if _, err := io.Copy(buf, req.Body); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}