diff --git a/options.go b/options.go
index 1b8236b..f3ba187 100644
--- a/options.go
+++ b/options.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"git.nspix.com/golang/kos/util/env"
 	"git.nspix.com/golang/kos/util/ip"
+	"git.nspix.com/golang/kos/util/sys"
 	"os"
 	"strings"
 	"syscall"
@@ -68,7 +69,7 @@ func WithDebug() Option {
 
 func NewOptions() *Options {
 	opts := &Options{
-		Name:     env.Get(EnvAppName, ""),
+		Name:     env.Get(EnvAppName, sys.Hostname()),
 		Version:  env.Get(EnvAppVersion, "0.0.1"),
 		Context:  context.Background(),
 		Metadata: make(map[string]string),
diff --git a/util/fetch/fetch.go b/util/fetch/fetch.go
index 0fb3e31..a4d6233 100644
--- a/util/fetch/fetch.go
+++ b/util/fetch/fetch.go
@@ -11,6 +11,7 @@ import (
 	"net"
 	"net/http"
 	"net/url"
+	"path"
 	"strings"
 	"time"
 )
@@ -63,7 +64,7 @@ func Get(ctx context.Context, urlString string, cbs ...Option) (res *http.Respon
 			req.Header.Set(k, v)
 		}
 	}
-	return Do(ctx, req)
+	return do(ctx, req, opts)
 }
 
 func Post(ctx context.Context, urlString string, cbs ...Option) (res *http.Response, err error) {
@@ -113,12 +114,10 @@ func Post(ctx context.Context, urlString string, cbs ...Option) (res *http.Respo
 			req.Header.Set(k, v)
 		}
 	}
-	req.Header.Set("Content-Type", contentType)
-	return Do(ctx, req)
-}
-
-func Do(ctx context.Context, req *http.Request) (res *http.Response, err error) {
-	return httpClient.Do(req.WithContext(ctx))
+	if contentType != "" {
+		req.Header.Set("Content-Type", contentType)
+	}
+	return do(ctx, req, opts)
 }
 
 func Request(ctx context.Context, urlString string, response any, cbs ...Option) (err error) {
@@ -151,7 +150,7 @@ func Request(ctx context.Context, urlString string, response any, cbs ...Option)
 			req.Header.Set(k, v)
 		}
 	}
-	if res, err = Do(ctx, req); err != nil {
+	if res, err = do(ctx, req, opts); err != nil {
 		return
 	}
 	defer func() {
@@ -166,12 +165,28 @@ func Request(ctx context.Context, urlString string, response any, cbs ...Option)
 		return
 	}
 	contentType = strings.ToLower(res.Header.Get("Content-Type"))
-	if strings.Contains(contentType, JSON) {
+	extName := path.Ext(req.URL.String())
+	if strings.Contains(contentType, JSON) || extName == ".json" {
 		err = json.NewDecoder(res.Body).Decode(response)
-	} else if strings.Contains(contentType, XML) {
+	} else if strings.Contains(contentType, XML) || extName == ".xml" {
 		err = xml.NewDecoder(res.Body).Decode(response)
 	} else {
 		err = fmt.Errorf("unsupported content type: %s", contentType)
 	}
 	return
 }
+
+func do(ctx context.Context, req *http.Request, opts *Options) (res *http.Response, err error) {
+	if opts.Human {
+		if req.Header.Get("User-Agent") == "" {
+			req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36 Edg/111.0.1661.54")
+		}
+		if req.Header.Get("Referer") == "" {
+			req.Header.Set("Referer", req.URL.String())
+		}
+		if req.Header.Get("Accept") == "" {
+			req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7")
+		}
+	}
+	return httpClient.Do(req.WithContext(ctx))
+}
diff --git a/util/fetch/options.go b/util/fetch/options.go
index 5ccfc0b..31bc0db 100644
--- a/util/fetch/options.go
+++ b/util/fetch/options.go
@@ -9,6 +9,7 @@ type (
 		Header map[string]string
 		Params map[string]string
 		Data   any
+		Human  bool
 	}
 	Option func(o *Options)
 )
@@ -27,7 +28,18 @@ func WithMethod(s string) Option {
 
 func WithHeader(h map[string]string) Option {
 	return func(o *Options) {
-		o.Header = h
+		if o.Header == nil {
+			o.Header = h
+		}
+		for k, v := range o.Header {
+			o.Header[k] = v
+		}
+	}
+}
+
+func WithHuman() Option {
+	return func(o *Options) {
+		o.Human = true
 	}
 }
 
diff --git a/util/sys/name.go b/util/sys/name.go
new file mode 100644
index 0000000..65becd2
--- /dev/null
+++ b/util/sys/name.go
@@ -0,0 +1,8 @@
+package sys
+
+import "os"
+
+func Hostname() string {
+	s, _ := os.Hostname()
+	return s
+}