Squashed commit of the following:

commit 9fa866688216dd5f08a22c5f3c01da3337fc400f
Merge: 8b0f94e6 8a49875
Author: Pasha, Rehan <Rehan.Pasha@fmr.com>
Date:   Sat Sep 7 21:58:48 2024 +0530

    Merge branch 'main' into fix-5402

    Signed-off-by: Pasha, Rehan <Rehan.Pasha@fmr.com>

commit 8b0f94e6b500c5e2d65d1c65bbcbb63087afe7e7
Author: Pasha, Rehan <Rehan.Pasha@fmr.com>
Date:   Sat Sep 7 21:57:41 2024 +0530

    Update CHANGELOG.md

    Signed-off-by: Pasha, Rehan <Rehan.Pasha@fmr.com>

commit f76eb1d70480828fb0626b3285a46a82cd6c13a7
Author: Pasha, Rehan <Rehan.Pasha@fmr.com>
Date:   Sat Sep 7 20:35:39 2024 +0530

    Delete instrgen/driver/driver

    Signed-off-by: Pasha, Rehan <Rehan.Pasha@fmr.com>

commit 158e36cae0eff704203349929c919c0d8f4e669d
Author: Rehan Pasha <rehan.pasha@fmr.com>
Date:   Sat Sep 7 11:03:24 2024 -0400

    Updating test case and lint

    Signed-off-by: Rehan Pasha <rehan.pasha@fmr.com>

commit 256b7de
Author: Rehan Pasha <rehan.pasha@fmr.com>
Date:   Tue Aug 27 06:28:33 2024 -0400

    Adding test case for otelmux and fixing lint

    Signed-off-by: Rehan Pasha <rehan.pasha@fmr.com>

Signed-off-by: Rehan Pasha <rehan.pasha@fmr.com>

instrumentation/github.com/gorilla/mux/otelmux/mux.go

@@ -4,7 +4,9 @@
 package otelmux // import "go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux"
 
 import (
+	"bufio"
 	"fmt"
+	"net"
 	"net/http"
 	"sync"
 
@@ -76,6 +78,13 @@ type recordingResponseWriter struct {
 	status  int
 }
 
+func (h *recordingResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	if hijacker, ok := h.writer.(http.Hijacker); ok {
+		return hijacker.Hijack()
+	}
+	return nil, nil, fmt.Errorf("underlying ResponseWriter does not support hijacking")
+}
+
 var rrwPool = &sync.Pool{
 	New: func() interface{} {
 		return &recordingResponseWriter{}

instrumentation/github.com/gorilla/mux/otelmux/test/mux_test.go

@@ -23,6 +23,63 @@ import (
 	"go.opentelemetry.io/otel/trace"
 )
 
+func TestRecordingResponseWriterHijackWithMiddleware(t *testing.T) {
+	// Create a mock HTTP handler
+	mockHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		hj, ok := w.(http.Hijacker)
+		require.True(t, ok, "ResponseWriter does not implement http.Hijacker")
+
+		conn, rw, err := hj.Hijack()
+		require.NoError(t, err)
+		assert.NotNil(t, conn)
+		assert.NotNil(t, rw)
+
+		err = conn.Close()
+		require.NoError(t, err)
+	})
+
+	// Wrap the handler with otelmux.Middleware
+	router := mux.NewRouter()
+	router.Use(otelmux.Middleware("test-service"))
+	router.Handle("/hijack", mockHandler)
+
+	// Create a mock HTTP request and response writer
+	req := httptest.NewRequest("GET", "http://example.com/hijack", nil)
+	rr := httptest.NewRecorder()
+
+	// Serve the HTTP request using the wrapped handler
+	router.ServeHTTP(rr, req)
+
+	// Verify the response status
+	assert.Equal(t, http.StatusOK, rr.Code)
+}
+
+func TestRecordingResponseWriterHijackNonHijackerWithMiddleware(t *testing.T) {
+	// Create a mock HTTP handler
+	mockHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		hj, ok := w.(http.Hijacker)
+		require.False(t, ok, "ResponseWriter should not implement http.Hijacker")
+
+		_, _, err := hj.Hijack()
+		assert.Error(t, err)
+	})
+
+	// Wrap the handler with otelmux.Middleware
+	router := mux.NewRouter()
+	router.Use(otelmux.Middleware("test-service"))
+	router.Handle("/non-hijack", mockHandler)
+
+	// Create a mock HTTP request and response writer
+	req := httptest.NewRequest("GET", "http://example.com/non-hijack", nil)
+	rr := httptest.NewRecorder()
+
+	// Serve the HTTP request using the wrapped handler
+	router.ServeHTTP(rr, req)
+
+	// Verify the response status
+	assert.Equal(t, http.StatusOK, rr.Code)
+}
+
 func TestCustomSpanNameFormatter(t *testing.T) {
 	exporter := tracetest.NewInMemoryExporter()