diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a969337..97baa37 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
         # The Windows build currently fail because of https://github.com/golang/go/issues/40795, and because xcaddy isn't compatible with the known workaround
         #os: [ ubuntu-latest, macos-latest, windows-latest ]
         os: [ ubuntu-latest, macos-latest ]
-        go: [ '1.19' ]
+        go: [ '1.20' ]
 
     runs-on: ${{ matrix.os }}
 
diff --git a/go.mod b/go.mod
index 31a10b6..dc46626 100644
--- a/go.mod
+++ b/go.mod
@@ -1,11 +1,11 @@
 module github.com/caddyserver/cache-handler
 
-go 1.19
+go 1.20
 
 require (
 	github.com/buraksezer/olric v0.5.4
 	github.com/caddyserver/caddy/v2 v2.6.4
-	github.com/darkweak/souin v1.6.39
+	github.com/darkweak/souin v1.6.40
 	go.uber.org/zap v1.24.0
 )
 
diff --git a/go.sum b/go.sum
index 75d9334..9c2b351 100644
--- a/go.sum
+++ b/go.sum
@@ -656,8 +656,8 @@ github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7Do
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/darkweak/go-esi v0.0.5 h1:b9LHI8Tz46R+i6p8avKPHAIBRQUCZDebNmKm5w/Zrns=
 github.com/darkweak/go-esi v0.0.5/go.mod h1:koCJqwum1u6mslyZuq/Phm6hfG1K3ZK5Y7jrUBTH654=
-github.com/darkweak/souin v1.6.39 h1:uVO18+pvy5N8dJH+CCfuBD3gx7AXWaBv+RjC9ee1pCk=
-github.com/darkweak/souin v1.6.39/go.mod h1:7B7VqPbFrF7AWJDRP6FCbE+zGiRUUqHAmWOs3Q2n4hk=
+github.com/darkweak/souin v1.6.40 h1:sjn6jLQNmGnyTsnxtBDP4/6P6E6YeFjRxuiy8EO2Eyg=
+github.com/darkweak/souin v1.6.40/go.mod h1:7B7VqPbFrF7AWJDRP6FCbE+zGiRUUqHAmWOs3Q2n4hk=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
diff --git a/httpcache_test.go b/httpcache_test.go
index 1eb9a4a..bde0a49 100644
--- a/httpcache_test.go
+++ b/httpcache_test.go
@@ -2,6 +2,7 @@ package httpcache
 
 import (
 	"net/http"
+	"strings"
 	"testing"
 	"time"
 
@@ -42,6 +43,41 @@ func TestMinimal(t *testing.T) {
 	}
 }
 
+func TestHead(t *testing.T) {
+	tester := caddytest.NewTester(t)
+	tester.InitServer(`
+	{
+		admin localhost:2999
+		order cache before rewrite
+		http_port     9080
+		https_port    9443
+		cache
+	}
+	localhost:9080 {
+		route /cache-head {
+			cache
+			respond "Hello, HEAD!"
+		}
+	}`, "caddyfile")
+
+	headReq, _ := http.NewRequest(http.MethodHead, "http://localhost:9080/cache-head", nil)
+	resp1, _ := tester.AssertResponse(headReq, 200, "")
+	if resp1.Header.Get("Cache-Status") != "Souin; fwd=uri-miss; stored; key=HEAD-http-localhost:9080-/cache-head" {
+		t.Errorf("unexpected Cache-Status header %v", resp1.Header)
+	}
+	if resp1.Header.Get("Content-Length") != "12" {
+		t.Errorf("unexpected Content-Length header %v", resp1.Header)
+	}
+
+	resp2, _ := tester.AssertResponse(headReq, 200, "")
+	if resp2.Header.Get("Cache-Status") != "Souin; hit; ttl=119; key=HEAD-http-localhost:9080-/cache-head" {
+		t.Errorf("unexpected Cache-Status header %v", resp2.Header)
+	}
+	if resp2.Header.Get("Content-Length") != "12" {
+		t.Errorf("unexpected Content-Length header %v", resp2.Header)
+	}
+}
+
 func TestQueryString(t *testing.T) {
 	tester := caddytest.NewTester(t)
 	tester.InitServer(`
@@ -51,7 +87,7 @@ func TestQueryString(t *testing.T) {
 		http_port     9080
 		https_port    9443
 		cache {
-			key { 
+			key {
 				disable_query
 			}
 		}
@@ -59,7 +95,7 @@ func TestQueryString(t *testing.T) {
 	localhost:9080 {
 		route /query-string {
 			cache {
-				key { 
+				key {
 					disable_query
 				}
 			}
@@ -430,3 +466,53 @@ func TestMustRevalidate(t *testing.T) {
 		t.Errorf("unexpected resp5 Age header %v", resp4.Header.Get("Age"))
 	}
 }
+
+type testETagsHandler struct{}
+
+const etagValue = "AAA-BBB"
+
+func (t *testETagsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if strings.Contains(r.Header.Get("If-None-Match"), etagValue) {
+		w.WriteHeader(http.StatusNotModified)
+
+		return
+	}
+	w.Header().Set("ETag", etagValue)
+	w.WriteHeader(http.StatusOK)
+	_, _ = w.Write([]byte("Hello etag!"))
+}
+
+func Test_ETags(t *testing.T) {
+	tester := caddytest.NewTester(t)
+	tester.InitServer(`
+	{
+		admin localhost:2999
+		order cache before rewrite
+		http_port     9080
+		cache {
+			ttl 50s
+			stale 50s
+		}
+	}
+	localhost:9080 {
+		route /etags {
+			cache
+			reverse_proxy localhost:9082
+		}
+	}`, "caddyfile")
+
+	etagsHandler := testETagsHandler{}
+	go func(eh *testETagsHandler) {
+		_ = http.ListenAndServe(":9082", eh)
+	}(&etagsHandler)
+	_, _ = tester.AssertGetResponse(`http://localhost:9080/etags`, http.StatusOK, "Hello etag!")
+	staleReq, _ := http.NewRequest(http.MethodGet, "http://localhost:9080/etags", nil)
+	staleReq.Header = http.Header{"If-None-Match": []string{etagValue}}
+	_, _ = tester.AssertResponse(staleReq, http.StatusNotModified, "")
+	staleReq.Header = http.Header{}
+	_, _ = tester.AssertResponse(staleReq, http.StatusOK, "Hello etag!")
+	staleReq.Header = http.Header{"If-None-Match": []string{etagValue}}
+	_, _ = tester.AssertResponse(staleReq, http.StatusNotModified, "")
+	staleReq.Header = http.Header{"If-None-Match": []string{"other"}}
+	_, _ = tester.AssertResponse(staleReq, http.StatusOK, "Hello etag!")
+}