diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4634eb4..adcef7e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+## [0.2.1] - 2020-10-18
+### Added
+* Add --header flag to specify HTTP header
+
 ## [0.2.0] - 2020-10-12
 ### Changed
 * Change server-host as "server" subcommand, not root command
@@ -18,5 +22,6 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 ### Added
 * Initial release
 
-[Unreleased]: https://github.com/nwtgck/go-piping-tunnel/compare/v0.2.0...HEAD
+[Unreleased]: https://github.com/nwtgck/go-piping-tunnel/compare/v0.2.1...HEAD
+[0.2.1]: https://github.com/nwtgck/go-piping-tunnel/compare/v0.2.0...v0.2.1
 [0.2.0]: https://github.com/nwtgck/go-piping-tunnel/compare/v0.1.0...v0.2.0
diff --git a/README.md b/README.md
index 411645d..a468d8d 100644
--- a/README.md
+++ b/README.md
@@ -18,12 +18,13 @@ Available Commands:
   server      Run server-host
 
 Flags:
-      --dns-server string   DNS server (e.g. 1.1.1.1:53)
-  -h, --help                help for piping-tunnel
-  -k, --insecure            Allow insecure server connections when using SSL
-      --progress            Show progress (default true)
-  -s, --server string       Piping Server URL (default "https://ppng.io")
-  -v, --version             show version
+      --dns-server string    DNS server (e.g. 1.1.1.1:53)
+  -H, --header stringArray   HTTP header
+  -h, --help                 help for piping-tunnel
+  -k, --insecure             Allow insecure server connections when using SSL
+      --progress             Show progress (default true)
+  -s, --server string        Piping Server URL (default "https://ppng.io")
+  -v, --version              show version
 
 Use "piping-tunnel [command] --help" for more information about a command.
 ```
diff --git a/cmd/client.go b/cmd/client.go
index 937e901..6c7b773 100644
--- a/cmd/client.go
+++ b/cmd/client.go
@@ -3,6 +3,7 @@ package cmd
 import (
 	"fmt"
 	"github.com/nwtgck/go-piping-tunnel/io_progress"
+	piping_tunnel_util "github.com/nwtgck/go-piping-tunnel/piping-tunnel-util"
 	"github.com/nwtgck/go-piping-tunnel/util"
 	"github.com/spf13/cobra"
 	"io"
@@ -28,6 +29,10 @@ var clientCmd = &cobra.Command{
 		if err != nil {
 			return err
 		}
+		headers, err := piping_tunnel_util.ParseKeyValueStrings(headerKeyValueStrs)
+		if err != nil {
+			return err
+		}
 		ln, err := net.Listen("tcp", fmt.Sprintf(":%d", clientHostPort))
 		if err != nil {
 			return err
@@ -86,14 +91,26 @@ var clientCmd = &cobra.Command{
 		if progress != nil {
 			reader = progress
 		}
-		_, err = httpClient.Post(clientToServerUrl, "application/octet-stream", reader)
+		req, err := http.NewRequest("POST", clientToServerUrl, reader)
+		if err != nil {
+			return err
+		}
+		req.Header.Set("Content-Type", "application/octet-stream")
+		for _, kv := range headers {
+			req.Header.Set(kv.Key, kv.Value)
+		}
+		_, err = httpClient.Do(req)
 		if err != nil {
 			return err
 		}
-		res, err := httpClient.Get(serverToClientUrl)
+		req, err = http.NewRequest("GET", serverToClientUrl, nil)
 		if err != nil {
 			return err
 		}
+		for _, kv := range headers {
+			req.Header.Set(kv.Key, kv.Value)
+		}
+		res, err := httpClient.Do(req)
 		var writer io.Writer = conn
 		if progress != nil {
 			writer = io.MultiWriter(conn, progress)
diff --git a/cmd/root.go b/cmd/root.go
index bb9e561..1aa8706 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -16,6 +16,7 @@ var insecure bool
 var dnsServer string
 var showsVersion bool
 var showProgress bool
+var headerKeyValueStrs []string
 
 func init() {
 	cobra.OnInitialize()
@@ -28,6 +29,7 @@ func init() {
 	RootCmd.PersistentFlags().StringVar(&dnsServer, "dns-server", "", "DNS server (e.g. 1.1.1.1:53)")
 	// NOTE: --insecure, -k is inspired by curl
 	RootCmd.PersistentFlags().BoolVarP(&insecure, "insecure", "k", false, "Allow insecure server connections when using SSL")
+	RootCmd.PersistentFlags().StringArrayVarP(&headerKeyValueStrs, "header", "H", []string{}, "HTTP header")
 	RootCmd.PersistentFlags().BoolVarP(&showProgress, "progress", "", true, "Show progress")
 	RootCmd.Flags().BoolVarP(&showsVersion, "version", "v", false, "show version")
 }
diff --git a/cmd/server.go b/cmd/server.go
index a80d947..6f6e3ef 100644
--- a/cmd/server.go
+++ b/cmd/server.go
@@ -3,6 +3,7 @@ package cmd
 import (
 	"fmt"
 	"github.com/nwtgck/go-piping-tunnel/io_progress"
+	piping_tunnel_util "github.com/nwtgck/go-piping-tunnel/piping-tunnel-util"
 	"github.com/nwtgck/go-piping-tunnel/util"
 	"github.com/spf13/cobra"
 	"io"
@@ -28,6 +29,10 @@ var serverCmd = &cobra.Command{
 		if err != nil {
 			return err
 		}
+		headers, err := piping_tunnel_util.ParseKeyValueStrings(headerKeyValueStrs)
+		if err != nil {
+			return err
+		}
 		conn, err := net.Dial("tcp", fmt.Sprintf("localhost:%d", serverHostPort))
 		if err != nil {
 			return err
@@ -61,7 +66,15 @@ var serverCmd = &cobra.Command{
 		if progress != nil {
 			reader = progress
 		}
-		_, err = httpClient.Post(serverToClientUrl, "application/octet-stream", reader)
+		req, err := http.NewRequest("POST", serverToClientUrl, reader)
+		if err != nil {
+			return err
+		}
+		req.Header.Set("Content-Type", "application/octet-stream")
+		for _, kv := range headers {
+			req.Header.Set(kv.Key, kv.Value)
+		}
+		_, err = httpClient.Do(req)
 		if err != nil {
 			return err
 		}
@@ -84,7 +97,14 @@ var serverCmd = &cobra.Command{
 			serverToClientPath,
 		)
 
-		res, err := httpClient.Get(clientToServerUrl)
+		req, err = http.NewRequest("GET", clientToServerUrl, nil)
+		if err != nil {
+			return err
+		}
+		for _, kv := range headers {
+			req.Header.Set(kv.Key, kv.Value)
+		}
+		res, err := httpClient.Do(req)
 		if err != nil {
 			return err
 		}
diff --git a/go.mod b/go.mod
index be05335..b41722e 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,4 @@ module github.com/nwtgck/go-piping-tunnel
 
 go 1.14
 
-require (
-	github.com/spf13/cobra v1.0.0
-)
+require github.com/spf13/cobra v1.1.0
diff --git a/go.sum b/go.sum
index 7cbaa56..bda74ff 100644
--- a/go.sum
+++ b/go.sum
@@ -1,24 +1,47 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
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@@ -28,18 +51,53 @@ github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zV
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@@ -49,7 +107,10 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
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@@ -57,13 +118,25 @@ github.com/mattn/go-runewidth v0.0.6/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m
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diff --git a/piping-tunnel-util/piping-tunnel-util.go b/piping-tunnel-util/piping-tunnel-util.go
new file mode 100644
index 0000000..d582df1
--- /dev/null
+++ b/piping-tunnel-util/piping-tunnel-util.go
@@ -0,0 +1,23 @@
+package piping_tunnel_util
+
+import (
+	"fmt"
+	"strings"
+)
+
+type KeyValue struct {
+	Key   string
+	Value string
+}
+
+func ParseKeyValueStrings(strKeyValues []string) ([]KeyValue, error) {
+	var keyValues []KeyValue
+	for _, str := range strKeyValues {
+		splitted := strings.SplitN(str, ":", 2)
+		if len(splitted) != 2 {
+			return nil, fmt.Errorf("invalid header format '%s'", str)
+		}
+		keyValues = append(keyValues, KeyValue{Key: splitted[0], Value: splitted[1]})
+	}
+	return keyValues, nil
+}
diff --git a/version/version.go b/version/version.go
index c62f7e6..fafddf1 100644
--- a/version/version.go
+++ b/version/version.go
@@ -1,3 +1,3 @@
 package version
 
-const Version = "0.2.0"
+const Version = "0.2.1"