feat: Add Drop method to DefaultCtx for silent connection termination

ctx.go

@@ -1978,3 +1978,8 @@ func (c *DefaultCtx) setMatched(matched bool) {
 func (c *DefaultCtx) setRoute(route *Route) {
 	c.route = route
 }
+
+func (c *DefaultCtx) Drop() error {
+	//nolint:wrapcheck // This must not be wrapped
+	return c.RequestCtx().Conn().Close()
+}

ctx_test.go

@@ -5847,6 +5847,35 @@ func Test_GenericParseTypeBoolean(t *testing.T) {
 	}
 }
 
+// go test -run Test_Ctx_Drop -v
+func Test_Ctx_Drop(t *testing.T) {
+	t.Parallel()
+
+	app := New()
+
+	// Handler that calls Drop
+	app.Get("/block-me", func(c Ctx) error {
+		return c.Drop()
+	})
+
+	// Additional handler that just calls return
+	app.Get("/no-response", func(_ Ctx) error {
+		return nil
+	})
+
+	// Test the Drop method
+	resp, err := app.Test(httptest.NewRequest(MethodGet, "/block-me", nil))
+	require.Error(t, err)
+	require.Nil(t, resp)
+
+	// Test the no-response handler
+	resp, err = app.Test(httptest.NewRequest(MethodGet, "/no-response", nil))
+	require.NoError(t, err)
+	require.NotNil(t, resp)
+	require.Equal(t, 200, resp.StatusCode)
+	require.Equal(t, "0", resp.Header.Get("Content-Length"))
+}
+
 // go test -run Test_GenericParseTypeString
 func Test_GenericParseTypeString(t *testing.T) {
 	t.Parallel()

docs/api/ctx.md

@@ -463,6 +463,27 @@ app.Get("/", func(c fiber.Ctx) error {
 })
 ```
 
+## Drop
+
+Terminates the client connection silently without sending any HTTP headers or response body.
+
+This can be used for scenarios where you want to block certain requests without notifying the client, such as mitigating
+DDoS attacks or protecting sensitive endpoints from unauthorized access.
+
+```go title="Signature"
+func (c fiber.Ctx) Drop() error
+```
+
+```go title="Example"
+app.Get("/", func(c fiber.Ctx) error {
+  if c.IP() == "192.168.1.1" {
+    return c.Drop()
+  }
+
+  return c.SendString("Hello World!")
+})
+```
+
 ## Format
 
 Performs content-negotiation on the [Accept](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept) HTTP header. It uses [Accepts](ctx.md#accepts) to select a proper format from the supplied offers. A default handler can be provided by setting the `MediaType` to `"default"`. If no offers match and no default is provided, a 406 (Not Acceptable) response is sent. The Content-Type is automatically set when a handler is selected.