diff --git a/.circleci/config.yml b/.circleci/config.yml
index a0eb0ed..ecb33f6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -16,8 +16,8 @@ jobs:
         type: string
         default: ""
     docker:
-      - image: "circleci/golang:<< parameters.version >>"
-    working_directory: /go/src/github.com/gorilla/websocket
+      - image: "cimg/go:<< parameters.version >>"
+    working_directory: /home/circleci/project/go/src/github.com/gorilla/websocket
     environment:
       GO111MODULE: "on"
       GOPROXY: "<< parameters.goproxy >>"
@@ -67,4 +67,4 @@ workflows:
       - test:
           matrix:
             parameters:
-              version: ["latest", "1.17", "1.16", "1.15", "1.14", "1.13", "1.12", "1.11"]
+              version: ["1.18", "1.17", "1.16"]
diff --git a/README.md b/README.md
index 2517a28..d33ed7f 100644
--- a/README.md
+++ b/README.md
@@ -7,12 +7,6 @@ Gorilla WebSocket is a [Go](http://golang.org/) implementation of the
 [WebSocket](http://www.rfc-editor.org/rfc/rfc6455.txt) protocol.
 
 
----
-
-⚠️ **[The Gorilla WebSocket Package is looking for a new maintainer](https://github.com/gorilla/websocket/issues/370)**
-
----
-
 ### Documentation
 
 * [API Reference](https://pkg.go.dev/github.com/gorilla/websocket?tab=doc)
diff --git a/client.go b/client.go
index 274bf6f..8790b91 100644
--- a/client.go
+++ b/client.go
@@ -9,6 +9,7 @@ import (
 	"context"
 	"crypto/tls"
 	"errors"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"net"
@@ -320,14 +321,14 @@ func (d *Dialer) DialContext(ctx context.Context, urlStr string, requestHeader h
 	}
 
 	netConn, err := netDial("tcp", hostPort)
+	if err != nil {
+		return nil, nil, err
+	}
 	if trace != nil && trace.GotConn != nil {
 		trace.GotConn(httptrace.GotConnInfo{
 			Conn: netConn,
 		})
 	}
-	if err != nil {
-		return nil, nil, err
-	}
 
 	defer func() {
 		if netConn != nil {
@@ -372,6 +373,17 @@ func (d *Dialer) DialContext(ctx context.Context, urlStr string, requestHeader h
 
 	resp, err := http.ReadResponse(conn.br, req)
 	if err != nil {
+		if d.TLSClientConfig != nil {
+			for _, proto := range d.TLSClientConfig.NextProtos {
+				if proto != "http/1.1" {
+					return nil, nil, fmt.Errorf(
+						"websocket: protocol %q was given but is not supported;"+
+							"sharing tls.Config with net/http Transport can cause this error: %w",
+						proto, err,
+					)
+				}
+			}
+		}
 		return nil, nil, err
 	}
 
diff --git a/client_server_test.go b/client_server_test.go
index e975e51..a47df48 100644
--- a/client_server_test.go
+++ b/client_server_test.go
@@ -1098,3 +1098,38 @@ func TestNetDialConnect(t *testing.T) {
 		}
 	}
 }
+func TestNextProtos(t *testing.T) {
+	ts := httptest.NewUnstartedServer(
+		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
+	)
+	ts.EnableHTTP2 = true
+	ts.StartTLS()
+	defer ts.Close()
+
+	d := Dialer{
+		TLSClientConfig: ts.Client().Transport.(*http.Transport).TLSClientConfig,
+	}
+
+	r, err := ts.Client().Get(ts.URL)
+	if err != nil {
+		t.Fatalf("Get: %v", err)
+	}
+	r.Body.Close()
+
+	// Asserts that Dialer.TLSClientConfig.NextProtos contains "h2"
+	// after the Client.Get call from net/http above.
+	var containsHTTP2 bool = false
+	for _, proto := range d.TLSClientConfig.NextProtos {
+		if proto == "h2" {
+			containsHTTP2 = true
+		}
+	}
+	if !containsHTTP2 {
+		t.Fatalf("Dialer.TLSClientConfig.NextProtos does not contain \"h2\"")
+	}
+
+	_, _, err = d.Dial(makeWsProto(ts.URL), nil)
+	if err == nil {
+		t.Fatalf("Dial succeeded, expect fail ")
+	}
+}
diff --git a/conn.go b/conn.go
index 331eebc..5161ef8 100644
--- a/conn.go
+++ b/conn.go
@@ -1189,8 +1189,16 @@ func (c *Conn) SetPongHandler(h func(appData string) error) {
 	c.handlePong = h
 }
 
+// NetConn returns the underlying connection that is wrapped by c.
+// Note that writing to or reading from this connection directly will corrupt the
+// WebSocket connection.
+func (c *Conn) NetConn() net.Conn {
+	return c.conn
+}
+
 // UnderlyingConn returns the internal net.Conn. This can be used to further
 // modifications to connection specific flags.
+// Deprecated: Use the NetConn method.
 func (c *Conn) UnderlyingConn() net.Conn {
 	return c.conn
 }
diff --git a/conn_test.go b/conn_test.go
index bd96e0a..06e5184 100644
--- a/conn_test.go
+++ b/conn_test.go
@@ -562,7 +562,7 @@ func TestAddrs(t *testing.T) {
 	}
 }
 
-func TestUnderlyingConn(t *testing.T) {
+func TestDeprecatedUnderlyingConn(t *testing.T) {
 	var b1, b2 bytes.Buffer
 	fc := fakeNetConn{Reader: &b1, Writer: &b2}
 	c := newConn(fc, true, 1024, 1024, nil, nil, nil)
@@ -572,6 +572,16 @@ func TestUnderlyingConn(t *testing.T) {
 	}
 }
 
+func TestNetConn(t *testing.T) {
+	var b1, b2 bytes.Buffer
+	fc := fakeNetConn{Reader: &b1, Writer: &b2}
+	c := newConn(fc, true, 1024, 1024, nil, nil, nil)
+	ul := c.NetConn()
+	if ul != fc {
+		t.Fatalf("Underlying conn is not what it should be.")
+	}
+}
+
 func TestBufioReadBytes(t *testing.T) {
 	// Test calling bufio.ReadBytes for value longer than read buffer size.
 
diff --git a/server_test.go b/server_test.go
index 3029aa8..5804be1 100644
--- a/server_test.go
+++ b/server_test.go
@@ -111,7 +111,7 @@ func TestBufioReuse(t *testing.T) {
 		if reuse := c.br == br; reuse != tt.reuse {
 			t.Errorf("%d: buffered reader reuse=%v, want %v", i, reuse, tt.reuse)
 		}
-		writeBuf := bufioWriterBuffer(c.UnderlyingConn(), bw)
+		writeBuf := bufioWriterBuffer(c.NetConn(), bw)
 		if reuse := &c.writeBuf[0] == &writeBuf[0]; reuse != tt.reuse {
 			t.Errorf("%d: write buffer reuse=%v, want %v", i, reuse, tt.reuse)
 		}