transport.go

//
// Copyright (c) 2015-2022 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//

package madmin

import (
	"crypto/tls"
	"net"
	"net/http"
	"time"
)

// DefaultTransport - this default transport is similar to
// http.DefaultTransport but with additional param  DisableCompression
// is set to true to avoid decompressing content with 'gzip' encoding.
var DefaultTransport = func(secure bool) http.RoundTripper {
	tr := &http.Transport{
		Proxy: http.ProxyFromEnvironment,
		DialContext: (&net.Dialer{
			Timeout:       5 * time.Second,
			KeepAlive:     15 * time.Second,
			FallbackDelay: 100 * time.Millisecond,
		}).DialContext,
		MaxIdleConns:          1024,
		MaxIdleConnsPerHost:   1024,
		ResponseHeaderTimeout: 60 * time.Second,
		IdleConnTimeout:       60 * time.Second,
		TLSHandshakeTimeout:   10 * time.Second,
		ExpectContinueTimeout: 1 * time.Second,
		// Set this value so that the underlying transport round-tripper
		// doesn't try to auto decode the body of objects with
		// content-encoding set to `gzip`.
		//
		// Refer:
		//    https://golang.org/src/net/http/transport.go?h=roundTrip#L1843
		DisableCompression: true,
	}

	if secure {
		tr.TLSClientConfig = &tls.Config{
			// Can't use SSLv3 because of POODLE and BEAST
			// Can't use TLSv1.0 because of POODLE and BEAST using CBC cipher
			// Can't use TLSv1.1 because of RC4 cipher usage
			MinVersion: tls.VersionTLS12,
		}
	}
	return tr
}