Refactor: move http client to the separate package

pkg/httpclient/httpclient.go

@@ -0,0 +1,29 @@
+package httpclient
+
+import (
+	"crypto/tls"
+	"net"
+	"net/http"
+	"time"
+)
+
+// NewHttpClient returns new http client
+func NewHttpClient() *http.Client {
+	return &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				Renegotiation: tls.RenegotiateFreelyAsClient,
+			},
+			Proxy: http.ProxyFromEnvironment,
+			Dial: (&net.Dialer{
+				Timeout:   30 * time.Second,
+				KeepAlive: 30 * time.Second,
+			}).Dial,
+			TLSHandshakeTimeout:   10 * time.Second,
+			ExpectContinueTimeout: 1 * time.Second,
+			MaxIdleConns:          100,
+			IdleConnTimeout:       90 * time.Second,
+		},
+		Timeout: time.Duration(time.Second * 30),
+	}
+}