Merge pull request #17 from adreed-msft/go-ieproxy

Transitioned go-pipeline to proxyMiddleman

go.mod

@@ -1 +1,5 @@
 module github.com/Azure/azure-pipeline-go
+
+go 1.12
+
+require github.com/mattn/go-ieproxy v0.0.0-20190610004146-91bb50d98149 // indirect

go.sum

@@ -0,0 +1,2 @@
+github.com/mattn/go-ieproxy v0.0.0-20190610004146-91bb50d98149 h1:HfxbT6/JcvIljmERptWhwa8XzP7H3T+Z2N26gTsaDaA=
+github.com/mattn/go-ieproxy v0.0.0-20190610004146-91bb50d98149/go.mod h1:31jz6HNzdxOmlERGGEc4v/dMssOfmp2p5bT/okiKFFc=

pipeline/core.go

@@ -2,6 +2,7 @@ package pipeline
 
 import (
 	"context"
+	"github.com/mattn/go-ieproxy"
 	"net"
 	"net/http"
 	"os"
@@ -204,7 +205,7 @@ func newDefaultHTTPClient() *http.Client {
 	// We want the Transport to have a large connection pool
 	return &http.Client{
 		Transport: &http.Transport{
-			Proxy: http.ProxyFromEnvironment,
+			Proxy: ieproxy.GetProxyFunc(),
 			// We use Dial instead of DialContext as DialContext has been reported to cause slower performance.
 			Dial /*Context*/ : (&net.Dialer{
 				Timeout:   30 * time.Second,