tuned some http settings, refactor

internal/common/http.go

@@ -1,28 +0,0 @@
-package common
-
-import (
-	"crypto/tls"
-	"net"
-	"net/http"
-	"time"
-)
-
-var (
-	defaultDialer = net.Dialer{
-		Timeout:   60 * time.Second,
-		KeepAlive: 60 * time.Second,
-	}
-	DefaultTransport = &http.Transport{
-		Proxy:               http.ProxyFromEnvironment,
-		DialContext:         defaultDialer.DialContext,
-		MaxIdleConnsPerHost: 1000,
-		IdleConnTimeout:     90 * time.Second,
-	}
-	DefaultTransportNoTLS = func() *http.Transport {
-		var clone = DefaultTransport.Clone()
-		clone.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
-		return clone
-	}()
-)
-
-const StaticFilePathPrefix = "/$gperrorpage/"