fixed options bug

example/main.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/zzfup/go-fetch"
+)
+
+func main() {
+	url := "http://www.baidu.com"
+	resp, err := fetch.Fetch(url, fetch.Options{})
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println(resp.ToString())
+}

fetch.go

@@ -12,11 +12,19 @@ import (
 // url: Absolute url
 // op: Fetch options
 func Fetch(url string, op Options) (Resp, error) {
-	defaultOp := newDefaultOptions()
-	defaultOp.Method = op.Method
-	defaultOp.Header = op.Header
-	defaultOp.Body = op.Body
-	defaultOp.Timeout = op.Timeout
+	defaultOp := NewDefaultOptions()
+	if op.Method != "" {
+		defaultOp.Method = op.Method
+	}
+	if op.Header != nil {
+		defaultOp.Header = op.Header
+	}
+	if op.Body != nil {
+		defaultOp.Body = op.Body
+	}
+	if int(op.Timeout) != 0 {
+		defaultOp.Timeout = op.Timeout
+	}
 
 	// create a new http client
 	client := &http.Client{

fetch_test.go

@@ -0,0 +1,33 @@
+package fetch
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestFetch(t *testing.T) {
+	type args struct {
+		url string
+		op  Options
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    Resp
+		wantErr bool
+	}{
+		// TODO: Add test cases.
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := Fetch(tt.args.url, tt.args.op)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Fetch() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Fetch() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

option.go

@@ -15,7 +15,8 @@ type Options struct {
 	Timeout time.Duration
 }
 
-func newDefaultOptions() Options {
+// NewDefaultOptions create a default options
+func NewDefaultOptions() Options {
 	return Options{
 		Method: "GET",
 		Header: map[string]string{