Merge 3a07160a182dca294cf264746bbcf4e12073faaa into 19b877fa50cbbb9282763099fb177a1e5cc5c850

fix lint

context.go

@@ -82,6 +82,9 @@ type Context struct {
 	// This mutex protects Keys map.
 	mu sync.RWMutex
 
+	// This mutex protects headers map
+	hmu sync.RWMutex
+
 	// Keys is a key/value pair exclusively for the context of each request.
 	Keys map[any]any
 
@@ -1031,6 +1034,8 @@ func (c *Context) IsWebsocket() bool {
 }
 
 func (c *Context) requestHeader(key string) string {
+	c.hmu.RLock()
+	defer c.hmu.RUnlock()
 	return c.Request.Header.Get(key)
 }
 
@@ -1060,6 +1065,8 @@ func (c *Context) Status(code int) {
 // It writes a header in the response.
 // If value == "", this method removes the header `c.Writer.Header().Del(key)`
 func (c *Context) Header(key, value string) {
+	c.hmu.Lock()
+	defer c.hmu.Unlock()
 	if value == "" {
 		c.Writer.Header().Del(key)
 		return

context_test.go

@@ -3462,6 +3462,48 @@ func TestContextSetCookieData(t *testing.T) {
 	})
 }
 
+func TestParallelHeaderAccess(t *testing.T) {
+	t.Parallel()
+	const iterations = 1000
+	const goroutines = 8
+
+	testCases := []struct {
+		name        string
+		writerCount int
+		readerCount int
+	}{
+		{"parallel_write_only", goroutines, 0},
+		{"parallel_write_and_read", goroutines / 2, goroutines / 2},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			c, _ := CreateTestContext(httptest.NewRecorder())
+			c.Request, _ = http.NewRequest(http.MethodGet, "/", nil)
+			wg := sync.WaitGroup{}
+			for i := 0; i < tc.writerCount; i++ {
+				wg.Add(1)
+				go func() {
+					defer wg.Done()
+					for range iterations {
+						c.Header("key", "value")
+					}
+				}()
+			}
+			for i := 0; i < tc.readerCount; i++ {
+				wg.Add(1)
+				go func() {
+					defer wg.Done()
+					for range iterations {
+						_ = c.GetHeader("key")
+					}
+				}()
+			}
+			wg.Wait()
+		})
+	}
+}
+
 func TestGetMapFromFormData(t *testing.T) {
 	testCases := []struct {
 		name     string