diff --git a/client-middleware/opentracing/go.sum b/client-middleware/opentracing/go.sum
index 202acb7d..d9ddc5de 100644
--- a/client-middleware/opentracing/go.sum
+++ b/client-middleware/opentracing/go.sum
@@ -42,8 +42,8 @@ github.com/go-openapi/swag/typeutils v0.29.1 h1:Nzv9nhnlLCRBPQqfOX+7lB6Guju370or
 github.com/go-openapi/swag/typeutils v0.29.1/go.mod h1:hxpgDZJVBkBsi/d3MIUosafoFdE5exaQRmVp0zwu3YE=
 github.com/go-openapi/swag/yamlutils v0.28.0 h1:TV3JXH6DS46KUroDtMLAYHGkdWf5VDq3wVWFirmzROY=
 github.com/go-openapi/swag/yamlutils v0.28.0/go.mod h1:x0q/yndZHEgk9Rx3DyDqzFUmHy55KTvIZldvF2dTJXs=
-github.com/go-openapi/testify/enable/yaml/v2 v2.6.1 h1:Jm+/ze2rMtbD98yen92AhATGLGREDYXG56Xr4gMjEtE=
-github.com/go-openapi/testify/enable/yaml/v2 v2.6.1/go.mod h1:YDPnwCRDu38/oJBVMBVXOUDiJ9cIeBHWvfImHaXqnv4=
+github.com/go-openapi/testify/enable/yaml/v2 v2.7.0 h1:wPW6YRgx3+SID1yUy/Xwa17L8kFEaEKod2VRbJDZNUs=
+github.com/go-openapi/testify/enable/yaml/v2 v2.7.0/go.mod h1:mI1M88etYbc3PhgHsWQK2kwvNwW5aGFqMPbmib+SGIs=
 github.com/go-openapi/testify/v2 v2.7.0 h1:bycOreEj6wfBvijg3YFogZ/sFjTCDmQnwSodSzHa3X8=
 github.com/go-openapi/testify/v2 v2.7.0/go.mod h1:SgsVHtfooshd0tublTtJ50FPKhujf47YRqauXXOUxfw=
 github.com/go-openapi/validate v0.26.3 h1:OkfZgLvLDnGP2hrRGD+42WBiPWWkoHomTJ+IVI+KaDc=
diff --git a/client/keepalive.go b/client/keepalive.go
index 6b6097d2..da66f355 100644
--- a/client/keepalive.go
+++ b/client/keepalive.go
@@ -35,6 +35,7 @@ func (k *keepAliveTransport) RoundTrip(r *http.Request) (*http.Response, error)
 type drainingReadCloser struct {
 	rdr     io.ReadCloser
 	seenEOF atomic.Uint32
+	discard io.Writer
 }
 
 func (d *drainingReadCloser) Read(p []byte) (n int, err error) {
@@ -51,7 +52,11 @@ func (d *drainingReadCloser) Close() error {
 		// If the reader side (a HTTP server) is misbehaving, it still may send
 		// some bytes, but the closer ignores them to keep the underling
 		// connection open.
-		_, _ = io.Copy(io.Discard, d.rdr)
+		discard := d.discard
+		if discard == nil {
+			discard = io.Discard
+		}
+		_, _ = io.Copy(discard, d.rdr)
 	}
 	return d.rdr.Close()
 }
diff --git a/client/keepalive_test.go b/client/keepalive_test.go
index 0391fbae..d0c87531 100644
--- a/client/keepalive_test.go
+++ b/client/keepalive_test.go
@@ -41,13 +41,10 @@ func (c *countingReadCloser) Close() error {
 
 func TestDrainingReadCloser(t *testing.T) {
 	rdr := newCountingReader(bytes.NewBufferString("There are many things to do"), false)
-	prevDisc := io.Discard
 	disc := bytes.NewBuffer(nil)
-	io.Discard = disc
-	defer func() { io.Discard = prevDisc }()
 
 	buf := make([]byte, 5)
-	ts := &drainingReadCloser{rdr: rdr}
+	ts := &drainingReadCloser{rdr: rdr, discard: disc}
 	_, err := ts.Read(buf)
 	require.NoError(t, err)
 	require.NoError(t, ts.Close())
@@ -59,13 +56,10 @@ func TestDrainingReadCloser(t *testing.T) {
 
 func TestDrainingReadCloser_SeenEOF(t *testing.T) {
 	rdr := newCountingReader(bytes.NewBufferString("There are many things to do"), true)
-	prevDisc := io.Discard
 	disc := bytes.NewBuffer(nil)
-	io.Discard = disc
-	defer func() { io.Discard = prevDisc }()
 
 	buf := make([]byte, 5)
-	ts := &drainingReadCloser{rdr: rdr}
+	ts := &drainingReadCloser{rdr: rdr, discard: disc}
 	_, err := ts.Read(buf)
 	require.NoError(t, err)
 	_, err = ts.Read(nil)
diff --git a/docs/examples/go.sum b/docs/examples/go.sum
index 6d68fabe..7a951488 100644
--- a/docs/examples/go.sum
+++ b/docs/examples/go.sum
@@ -47,8 +47,8 @@ github.com/go-openapi/swag/typeutils v0.29.1 h1:Nzv9nhnlLCRBPQqfOX+7lB6Guju370or
 github.com/go-openapi/swag/typeutils v0.29.1/go.mod h1:hxpgDZJVBkBsi/d3MIUosafoFdE5exaQRmVp0zwu3YE=
 github.com/go-openapi/swag/yamlutils v0.28.0 h1:TV3JXH6DS46KUroDtMLAYHGkdWf5VDq3wVWFirmzROY=
 github.com/go-openapi/swag/yamlutils v0.28.0/go.mod h1:x0q/yndZHEgk9Rx3DyDqzFUmHy55KTvIZldvF2dTJXs=
-github.com/go-openapi/testify/enable/yaml/v2 v2.6.1 h1:Jm+/ze2rMtbD98yen92AhATGLGREDYXG56Xr4gMjEtE=
-github.com/go-openapi/testify/enable/yaml/v2 v2.6.1/go.mod h1:YDPnwCRDu38/oJBVMBVXOUDiJ9cIeBHWvfImHaXqnv4=
+github.com/go-openapi/testify/enable/yaml/v2 v2.7.0 h1:wPW6YRgx3+SID1yUy/Xwa17L8kFEaEKod2VRbJDZNUs=
+github.com/go-openapi/testify/enable/yaml/v2 v2.7.0/go.mod h1:mI1M88etYbc3PhgHsWQK2kwvNwW5aGFqMPbmib+SGIs=
 github.com/go-openapi/testify/v2 v2.7.0 h1:bycOreEj6wfBvijg3YFogZ/sFjTCDmQnwSodSzHa3X8=
 github.com/go-openapi/testify/v2 v2.7.0/go.mod h1:SgsVHtfooshd0tublTtJ50FPKhujf47YRqauXXOUxfw=
 github.com/go-openapi/validate v0.26.3 h1:OkfZgLvLDnGP2hrRGD+42WBiPWWkoHomTJ+IVI+KaDc=