Merge b5e8b10371 into e46bd52185

context_test.go

@@ -27,11 +27,12 @@ import (
 	"time"
 
 	"github.com/gin-contrib/sse"
-	"github.com/gin-gonic/gin/binding"
-	testdata "github.com/gin-gonic/gin/testdata/protoexample"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/protobuf/proto"
+
+	"github.com/gin-gonic/gin/binding"
+	testdata "github.com/gin-gonic/gin/testdata/protoexample"
 )
 
 var _ context.Context = (*Context)(nil)
@@ -3123,3 +3124,23 @@ func TestContextNext(t *testing.T) {
 	assert.True(t, exists)
 	assert.Equal(t, "value3", value)
 }
+
+func TestParallelHeaderWrite(t *testing.T) {
+	c, _ := CreateTestContext(httptest.NewRecorder())
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		for i := 0; i < 1000; i++ {
+			c.Header("key", "value")
+		}
+	}()
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		for i := 0; i < 1000; i++ {
+			c.Header("key", "value")
+		}
+	}()
+	wg.Wait()
+}