fix the vendor files

vendor/github.com/mozillazg/go-httpheader/example_test.go

@@ -0,0 +1,52 @@
+package httpheader_test
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/mozillazg/go-httpheader"
+)
+
+func ExampleHeader() {
+	type Options struct {
+		ContentType  string `header:"Content-Type"`
+		Length       int
+		XArray       []string `header:"X-Array"`
+		TestHide     string   `header:"-"`
+		IgnoreEmpty  string   `header:"X-Empty,omitempty"`
+		IgnoreEmptyN string   `header:"X-Empty-N,omitempty"`
+		CustomHeader http.Header
+	}
+
+	opt := Options{
+		ContentType:  "application/json",
+		Length:       2,
+		XArray:       []string{"test1", "test2"},
+		TestHide:     "hide",
+		IgnoreEmptyN: "n",
+		CustomHeader: http.Header{
+			"X-Test-1": []string{"233"},
+			"X-Test-2": []string{"666"},
+		},
+	}
+	h, _ := httpheader.Header(opt)
+	fmt.Println(h["Content-Type"])
+	fmt.Println(h["Length"])
+	fmt.Println(h["X-Array"])
+	_, ok := h["TestHide"]
+	fmt.Println(ok)
+	_, ok = h["X-Empty"]
+	fmt.Println(ok)
+	fmt.Println(h["X-Empty-N"])
+	fmt.Println(h["X-Test-1"])
+	fmt.Println(h["X-Test-2"])
+	// Output:
+	// [application/json]
+	// [2]
+	// [test1 test2]
+	// false
+	// false
+	// [n]
+	// [233]
+	// [666]
+}