feat: Support SetReadDeadline, SetWriteDeadline and EnableFullDuplex

capture_metrics.go

@@ -84,3 +84,17 @@ func (m *Metrics) CaptureMetrics(w http.ResponseWriter, fn func(http.ResponseWri
 	fn(Wrap(w, hooks))
 	m.Duration += time.Since(start)
 }
+
+// deadliner defines two methods introduced in go 1.20. The standard library
+// seems not to provide an interface we can import, hence its definition here.
+type deadliner interface {
+	SetReadDeadline(deadline time.Time) error
+	SetWriteDeadline(deadline time.Time) error
+}
+
+// fullDuplexEnabler defines a method introduced in go 1.21. The standard
+// library seems not to provide an interface we can import, hence its definition
+// here.
+type fullDuplexEnabler interface {
+	EnableFullDuplex() error
+}

capture_metrics_test.go

@@ -2,7 +2,6 @@ package httpsnoop
 
 import (
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"net/http/httptest"
@@ -16,7 +15,7 @@ func TestCaptureMetrics(t *testing.T) {
 	// Some of the edge cases tested below cause the net/http pkg to log some
 	// messages that add a lot of noise to the `go test -v` output, so we discard
 	// the log here.
-	log.SetOutput(ioutil.Discard)
+	log.SetOutput(io.Discard)
 	defer log.SetOutput(os.Stderr)
 
 	tests := []struct {