Merge pull request #920 from jaffee/v0.7

bump http client's MaxIdleConns and MaxIdleConnsPerHost

executor.go

@@ -20,6 +20,7 @@ import (
 	"errors"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"net/url"
 	"sort"
@@ -57,7 +58,21 @@ type Executor struct {
 // NewExecutor returns a new instance of Executor.
 func NewExecutor() *Executor {
 	return &Executor{
-		HTTPClient: http.DefaultClient,
+		HTTPClient: &http.Client{
+			Transport: &http.Transport{
+				Proxy: http.ProxyFromEnvironment,
+				DialContext: (&net.Dialer{
+					Timeout:   30 * time.Second,
+					KeepAlive: 30 * time.Second,
+					DualStack: true,
+				}).DialContext,
+				MaxIdleConns:          1000,
+				MaxIdleConnsPerHost:   200,
+				IdleConnTimeout:       90 * time.Second,
+				TLSHandshakeTimeout:   10 * time.Second,
+				ExpectContinueTimeout: 1 * time.Second,
+			},
+		},
 	}
 }