3-Transport.md

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HTTP Connection Pool

Default

• MaxIdleConns: 100
• IdleConnTimeout: 90s
• MaxIdleConnsPerHost: 2

You can customize an http.Client to adjust these settings.

func main() {
	region := "cn-beijing"
	transport := &http.Transport{
		Proxy: http.ProxyFromEnvironment,
		DialContext: (&net.Dialer{
			Timeout:   30 * time.Second,
			KeepAlive: 30 * time.Second,
			DualStack: true,
		}).DialContext,
		MaxIdleConns:          100,
		IdleConnTimeout:       90 * time.Second,
		MaxIdleConnsPerHost:   10,
		TLSHandshakeTimeout:   10 * time.Second,
		ExpectContinueTimeout: 1 * time.Second,
	}

	client := &http.Client{
		Transport: transport,
		Timeout:   60 * time.Second,
	}
	config := volcengine.NewConfig().
		WithRegion(region).
		WithHTTPClient(client).
		WithCredentials(credentials.NewEnvCredentials())

	sess, err := session.NewSession(config)
	if err != nil {
		panic(err)
	}
	svc := ecs.New(sess)
}

HTTPS Request Configuration

Specify Scheme

Default

• https

In the SDK, disableSSL=true means using http, and disableSSL=false means using https.

func main() {
	region := "cn-beijing"
	config := volcengine.NewConfig().
		WithRegion(region).
		WithDisableSSL(true).
		WithCredentials(credentials.NewEnvCredentials())

	sess, err := session.NewSession(config)
	if err != nil {
		panic(err)
	}
	svc := ecs.New(sess)
}

Ignore SSL Verification

You can customize http.Client to skip certificate verification.

func main() {
	region := "cn-beijing"
	transport := &http.Transport{
		Proxy: http.ProxyFromEnvironment,
		DialContext: (&net.Dialer{
			Timeout:   30 * time.Second,
			KeepAlive: 30 * time.Second,
			DualStack: true,
		}).DialContext,
		MaxIdleConns:          100,
		IdleConnTimeout:       90 * time.Second,
		MaxIdleConnsPerHost:   10,
		TLSHandshakeTimeout:   10 * time.Second,
		ExpectContinueTimeout: 1 * time.Second,
		TLSClientConfig:       &tls.Config{InsecureSkipVerify: true},
	}

	client := &http.Client{
		Transport: transport,
		Timeout:   60 * time.Second,
	}
	config := volcengine.NewConfig().
		WithRegion(region).
		WithHTTPClient(client).
		WithCredentials(credentials.NewEnvCredentials())

	sess, err := session.NewSession(config)
	if err != nil {
		panic(err)
	}
	svc := ecs.New(sess)
}

Specify TLS Version

You can customize TLS min/max versions via TLSClientConfig.

func main() {
	region := "cn-beijing"
	transport := &http.Transport{
		Proxy: http.ProxyFromEnvironment,
		DialContext: (&net.Dialer{
			Timeout:   30 * time.Second,
			KeepAlive: 30 * time.Second,
			DualStack: true,
		}).DialContext,
		MaxIdleConns:          100,
		IdleConnTimeout:       90 * time.Second,
		MaxIdleConnsPerHost:   10,
		TLSHandshakeTimeout:   10 * time.Second,
		ExpectContinueTimeout: 1 * time.Second,
		TLSClientConfig: &tls.Config{
			MinVersion: tls.VersionTLS12,
			MaxVersion: tls.VersionTLS13,
		},
	}

	client := &http.Client{
		Transport: transport,
		Timeout:   60 * time.Second,
	}
	config := volcengine.NewConfig().
		WithRegion(region).
		WithHTTPClient(client).
		WithCredentials(credentials.NewEnvCredentials())

	sess, err := session.NewSession(config)
	if err != nil {
		panic(err)
	}
	svc := ecs.New(sess)
}

HTTP(S) Proxy

Default

• No proxy

Configure HTTP(S) Proxy

var ak, sk, region string
config = volcengine.NewConfig().
	WithCredentials(credentials.NewStaticCredentials(ak, sk, "")).
	WithRegion(region).WithHTTPProxy("http://your_proxy:8080").WithHTTPSProxy("http://your_proxy:8080")

sess, _ = session.NewSession(config)
client = ecs.New(sess)

Notes

Supported environment variables:

• http_proxy / HTTP_PROXY
• https_proxy / HTTPS_PROXY

Priority: code > environment variables.

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