diff --git a/client/client.go b/client/client.go
index 8e41864..04b0ae5 100644
--- a/client/client.go
+++ b/client/client.go
@@ -10,4 +10,5 @@ type Client interface {
 	pingv1connect.PingServiceClient
 	runnerv1connect.RunnerServiceClient
 	Address() string
+	Insecure() bool
 }
diff --git a/client/http.go b/client/http.go
index f551980..2c2d628 100644
--- a/client/http.go
+++ b/client/http.go
@@ -1,17 +1,32 @@
 package client
 
 import (
-	"code.gitea.io/actions-proto-go/ping/v1/pingv1connect"
-	"code.gitea.io/actions-proto-go/runner/v1/runnerv1connect"
 	"context"
-	"gitea.com/gitea/act_runner/core"
-	"github.com/bufbuild/connect-go"
+	"crypto/tls"
 	"net/http"
 	"strings"
+
+	"code.gitea.io/actions-proto-go/ping/v1/pingv1connect"
+	"code.gitea.io/actions-proto-go/runner/v1/runnerv1connect"
+	"gitea.com/gitea/act_runner/core"
+	"github.com/bufbuild/connect-go"
 )
 
+func getHttpClient(endpoint string, insecure bool) *http.Client {
+	if strings.HasPrefix(endpoint, "https://") && insecure {
+		return &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: &tls.Config{
+					InsecureSkipVerify: true,
+				},
+			},
+		}
+	}
+	return http.DefaultClient
+}
+
 // New returns a new runner client.
-func New(endpoint string, uuid, token string, opts ...connect.ClientOption) *HTTPClient {
+func New(endpoint string, insecure bool, uuid, token string, opts ...connect.ClientOption) *HTTPClient {
 	baseURL := strings.TrimRight(endpoint, "/") + "/api/actions"
 
 	opts = append(opts, connect.WithInterceptors(connect.UnaryInterceptorFunc(func(next connect.UnaryFunc) connect.UnaryFunc {
@@ -28,16 +43,17 @@ func New(endpoint string, uuid, token string, opts ...connect.ClientOption) *HTT
 
 	return &HTTPClient{
 		PingServiceClient: pingv1connect.NewPingServiceClient(
-			http.DefaultClient,
+			getHttpClient(endpoint, insecure),
 			baseURL,
 			opts...,
 		),
 		RunnerServiceClient: runnerv1connect.NewRunnerServiceClient(
-			http.DefaultClient,
+			getHttpClient(endpoint, insecure),
 			baseURL,
 			opts...,
 		),
 		endpoint: endpoint,
+		insecure: insecure,
 	}
 }
 
@@ -45,6 +61,10 @@ func (c *HTTPClient) Address() string {
 	return c.endpoint
 }
 
+func (c *HTTPClient) Insecure() bool {
+	return c.insecure
+}
+
 var _ Client = (*HTTPClient)(nil)
 
 // An HTTPClient manages communication with the runner API.
@@ -52,4 +72,5 @@ type HTTPClient struct {
 	pingv1connect.PingServiceClient
 	runnerv1connect.RunnerServiceClient
 	endpoint string
+	insecure bool
 }
diff --git a/cmd/cmd.go b/cmd/cmd.go
index 1a42b34..278a0df 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -38,6 +38,7 @@ func Execute(ctx context.Context) {
 	}
 	registerCmd.Flags().BoolVar(&regArgs.NoInteractive, "no-interactive", false, "Disable interactive mode")
 	registerCmd.Flags().StringVar(&regArgs.InstanceAddr, "instance", "", "Gitea instance address")
+	registerCmd.Flags().BoolVar(&regArgs.Insecure, "insecure", false, "If check server's certificate if it's https protocol")
 	registerCmd.Flags().StringVar(&regArgs.Token, "token", "", "Runner token")
 	registerCmd.Flags().StringVar(&regArgs.RunnerName, "name", "", "Runner name")
 	registerCmd.Flags().StringVar(&regArgs.Labels, "labels", "", "Runner tags, comma separated")
diff --git a/cmd/daemon.go b/cmd/daemon.go
index fe0c40e..46d78ad 100644
--- a/cmd/daemon.go
+++ b/cmd/daemon.go
@@ -53,6 +53,7 @@ func runDaemon(ctx context.Context, envFile string) func(cmd *cobra.Command, arg
 
 		cli := client.New(
 			cfg.Client.Address,
+			cfg.Client.Insecure,
 			cfg.Runner.UUID,
 			cfg.Runner.Token,
 		)
diff --git a/cmd/register.go b/cmd/register.go
index 56d8a0f..8990f0f 100644
--- a/cmd/register.go
+++ b/cmd/register.go
@@ -69,6 +69,7 @@ func runRegister(ctx context.Context, regArgs *registerArgs, envFile string) fun
 type registerArgs struct {
 	NoInteractive bool
 	InstanceAddr  string
+	Insecure      bool
 	Token         string
 	RunnerName    string
 	Labels        string
@@ -87,17 +88,16 @@ const (
 	StageExit
 )
 
-var (
-	defaultLabels = []string{
-		"ubuntu-latest:docker://node:16-bullseye",
-		"ubuntu-22.04:docker://node:16-bullseye", // There's no node:16-bookworm yet
-		"ubuntu-20.04:docker://node:16-bullseye",
-		"ubuntu-18.04:docker://node:16-buster",
-	}
-)
+var defaultLabels = []string{
+	"ubuntu-latest:docker://node:16-bullseye",
+	"ubuntu-22.04:docker://node:16-bullseye", // There's no node:16-bookworm yet
+	"ubuntu-20.04:docker://node:16-bullseye",
+	"ubuntu-18.04:docker://node:16-buster",
+}
 
 type registerInputs struct {
 	InstanceAddr string
+	Insecure     bool
 	Token        string
 	RunnerName   string
 	CustomLabels []string
@@ -239,6 +239,7 @@ func registerNoInteractive(envFile string, regArgs *registerArgs) error {
 	cfg, _ := config.FromEnviron()
 	inputs := &registerInputs{
 		InstanceAddr: regArgs.InstanceAddr,
+		Insecure:     regArgs.Insecure,
 		Token:        regArgs.Token,
 		RunnerName:   regArgs.RunnerName,
 		CustomLabels: defaultLabels,
@@ -269,6 +270,7 @@ func doRegister(cfg *config.Config, inputs *registerInputs) error {
 	// initial http client
 	cli := client.New(
 		inputs.InstanceAddr,
+		inputs.Insecure,
 		"", "",
 	)
 
diff --git a/config/config.go b/config/config.go
index f0fc2eb..53a4cf1 100644
--- a/config/config.go
+++ b/config/config.go
@@ -5,6 +5,7 @@ import (
 	"io"
 	"os"
 	"runtime"
+	"strconv"
 
 	"gitea.com/gitea/act_runner/core"
 
@@ -23,7 +24,8 @@ type (
 	}
 
 	Client struct {
-		Address string `ignored:"true"`
+		Address  string `ignored:"true"`
+		Insecure bool
 	}
 
 	Runner struct {
@@ -51,7 +53,8 @@ func FromEnviron() (Config, error) {
 	}
 
 	// check runner config exist
-	if f, err := os.Stat(cfg.Runner.File); err == nil && !f.IsDir() {
+	f, err := os.Stat(cfg.Runner.File)
+	if err == nil && !f.IsDir() {
 		jsonFile, _ := os.Open(cfg.Runner.File)
 		defer jsonFile.Close()
 		byteValue, _ := io.ReadAll(jsonFile)
@@ -71,6 +74,11 @@ func FromEnviron() (Config, error) {
 		if runner.Address != "" {
 			cfg.Client.Address = runner.Address
 		}
+		if runner.Insecure != "" {
+			cfg.Client.Insecure, _ = strconv.ParseBool(runner.Insecure)
+		}
+	} else if err != nil {
+		return cfg, err
 	}
 
 	// runner config
diff --git a/core/runner.go b/core/runner.go
index 6ae15dc..da58835 100644
--- a/core/runner.go
+++ b/core/runner.go
@@ -7,10 +7,11 @@ const (
 
 // Runner struct
 type Runner struct {
-	ID      int64    `json:"id"`
-	UUID    string   `json:"uuid"`
-	Name    string   `json:"name"`
-	Token   string   `json:"token"`
-	Address string   `json:"address"`
-	Labels  []string `json:"labels"`
+	ID       int64    `json:"id"`
+	UUID     string   `json:"uuid"`
+	Name     string   `json:"name"`
+	Token    string   `json:"token"`
+	Address  string   `json:"address"`
+	Insecure string   `json:"insecure"`
+	Labels   []string `json:"labels"`
 }
diff --git a/register/register.go b/register/register.go
index 49dd3e0..3c5e7d1 100644
--- a/register/register.go
+++ b/register/register.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"os"
+	"strconv"
 	"strings"
 
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
@@ -42,12 +43,13 @@ func (p *Register) Register(ctx context.Context, cfg config.Runner) (*core.Runne
 	}
 
 	data := &core.Runner{
-		ID:      resp.Msg.Runner.Id,
-		UUID:    resp.Msg.Runner.Uuid,
-		Name:    resp.Msg.Runner.Name,
-		Token:   resp.Msg.Runner.Token,
-		Address: p.Client.Address(),
-		Labels:  cfg.Labels,
+		ID:       resp.Msg.Runner.Id,
+		UUID:     resp.Msg.Runner.Uuid,
+		Name:     resp.Msg.Runner.Name,
+		Token:    resp.Msg.Runner.Token,
+		Address:  p.Client.Address(),
+		Insecure: strconv.FormatBool(p.Client.Insecure()),
+		Labels:   cfg.Labels,
 	}
 
 	file, err := json.MarshalIndent(data, "", "  ")