chore: support min go version 1.18

.github/workflows/gin.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup go
         uses: actions/setup-go@v3
         with:
-          go-version: '^1.16'
+          go-version: '^1.18'
       - name: Checkout repository
         uses: actions/checkout@v3
       - name: Setup golangci-lint
@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        go: ['1.16', '1.17', '1.18', '1.19', '1.20']
+        go: ['1.18', '1.19', '1.20']
         test-tags: ['', '-tags nomsgpack', '-tags "sonic avx"', '-tags go_json']
         include:
           - os: ubuntu-latest
@@ -73,7 +73,7 @@ jobs:
           flags: ${{ matrix.os }},go-${{ matrix.go }},${{ matrix.test-tags }}
 
       - name: Format
-        if: matrix.go-version == '1.19.x'
+        if: matrix.go-version == '1.20.x'
         run: diff -u <(echo -n) <(gofmt -d .)
   notification-gitter:
     needs: test

.github/workflows/goreleaser.yml

@@ -21,7 +21,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: 1.17
+          go-version: 1.20
       -
         name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v4

README.md

@@ -31,7 +31,7 @@ Gin is a web framework written in [Go](https://go.dev/). It features a martini-l
 
 ### Prerequisites
 
-- **[Go](https://go.dev/)**: ~~any one of the **three latest major** [releases](https://go.dev/doc/devel/release)~~ (now version **1.16+** is required).
+- **[Go](https://go.dev/)**: any one of the **three latest major** [releases](https://go.dev/doc/devel/release) (we test it with this).
 
 ### Getting Gin
 
@@ -46,7 +46,7 @@ to your code, and then `go [build|run|test]` will automatically fetch the necess
 Otherwise, run the following Go command to install the `gin` package:
 
 ```sh
-$ go get -u github.com/gin-gonic/gin
+$ go install github.com/gin-gonic/gin@latest
 ```
 
 ### Running Gin

context_1.16_test.go → context_1.18_test.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.
 
-//go:build !go1.17
-// +build !go1.17
+//go:build !go1.19
+// +build !go1.19
 
 package gin
 
@@ -17,15 +17,22 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestContextFormFileFailed16(t *testing.T) {
+func TestContextFormFileFailed18(t *testing.T) {
 	buf := new(bytes.Buffer)
 	mw := multipart.NewWriter(buf)
-	mw.Close()
+	defer func(mw *multipart.Writer) {
+		err := mw.Close()
+		if err != nil {
+			assert.Error(t, err)
+		}
+	}(mw)
 	c, _ := CreateTestContext(httptest.NewRecorder())
 	c.Request, _ = http.NewRequest("POST", "/", nil)
 	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
 	c.engine.MaxMultipartMemory = 8 << 20
-	f, err := c.FormFile("file")
-	assert.Error(t, err)
-	assert.Nil(t, f)
+	assert.Panics(t, func() {
+		f, err := c.FormFile("file")
+		assert.Error(t, err)
+		assert.Nil(t, f)
+	})
 }

context_test.go

@@ -2374,3 +2374,42 @@ func TestCreateTestContextWithRouteParams(t *testing.T) {
 	assert.Equal(t, http.StatusOK, w.Code)
 	assert.Equal(t, "hello gin", w.Body.String())
 }
+
+type interceptedWriter struct {
+	ResponseWriter
+	b *bytes.Buffer
+}
+
+func (i interceptedWriter) WriteHeader(code int) {
+	i.Header().Del("X-Test")
+	i.ResponseWriter.WriteHeader(code)
+}
+
+func TestInterceptedHeader(t *testing.T) {
+	w := httptest.NewRecorder()
+	c, r := CreateTestContext(w)
+
+	r.Use(func(c *Context) {
+		i := interceptedWriter{
+			ResponseWriter: c.Writer,
+			b:              bytes.NewBuffer(nil),
+		}
+		c.Writer = i
+		c.Next()
+		c.Header("X-Test", "overridden")
+		c.Writer = i.ResponseWriter
+	})
+	r.GET("/", func(c *Context) {
+		c.Header("X-Test", "original")
+		c.Header("X-Test-2", "present")
+		c.String(http.StatusOK, "hello world")
+	})
+	c.Request = httptest.NewRequest("GET", "/", nil)
+	r.HandleContext(c)
+	// Result() has headers frozen when WriteHeaderNow() has been called
+	// Compared to this time, this is when the response headers will be flushed
+	// As response is flushed on c.String, the Header cannot be set by the first
+	// middleware. Assert this
+	assert.Equal(t, "", w.Result().Header.Get("X-Test"))
+	assert.Equal(t, "present", w.Result().Header.Get("X-Test-2"))
+}

debug.go

@@ -12,7 +12,7 @@ import (
 	"strings"
 )
 
-const ginSupportMinGoVer = 16
+const ginSupportMinGoVer = 18
 
 // IsDebugging returns true if the framework is running in debug mode.
 // Use SetMode(gin.ReleaseMode) to disable debug mode.
@@ -67,7 +67,7 @@ func getMinVer(v string) (uint64, error) {
 
 func debugPrintWARNINGDefault() {
 	if v, e := getMinVer(runtime.Version()); e == nil && v < ginSupportMinGoVer {
-		debugPrint(`[WARNING] Now Gin requires Go 1.16+.
+		debugPrint(`[WARNING] Now Gin requires Go 1.18+.
 
 `)
 	}

debug_test.go

@@ -104,7 +104,7 @@ func TestDebugPrintWARNINGDefault(t *testing.T) {
 	})
 	m, e := getMinVer(runtime.Version())
 	if e == nil && m < ginSupportMinGoVer {
-		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.16+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
+		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.18+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	} else {
 		assert.Equal(t, "[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	}