customize tcp handshake timeouts

shot in the dark at avoiding tcp read timeouts by
extending the tcp dialer and tls handshake timeouts
in the graph client transport.

src/internal/connector/graph/http_wrapper.go

@@ -37,7 +37,7 @@ func NewHTTPWrapper(opts ...Option) *httpWrapper {
 		rt = customTransport{
 			n: pipeline{
 				middlewares: internalMiddleware(cc),
-				transport:   defaultTransport(),
+				transport:   defaultHttpTransport(),
 			},
 		}
 		redirect = func(req *http.Request, via []*http.Request) error {
@@ -132,13 +132,6 @@ func (pl pipeline) Next(req *http.Request, idx int) (*http.Response, error) {
 	return pl.transport.RoundTrip(req)
 }
 
-func defaultTransport() http.RoundTripper {
-	defaultTransport := http.DefaultTransport.(*http.Transport).Clone()
-	defaultTransport.ForceAttemptHTTP2 = true
-
-	return defaultTransport
-}
-
 func internalMiddleware(cc *clientConfig) []khttp.Middleware {
 	mw := []khttp.Middleware{
 		&RetryMiddleware{

src/internal/connector/graph/service.go

@@ -1,6 +1,7 @@
 package graph
 
 import (
+	"net"
 	"net/http"
 	"time"
 
@@ -150,12 +151,14 @@ func GetAuth(tenant string, client string, secret string) (*kauth.AzureIdentityA
 // can utilize it on a per-download basis.
 func KiotaHTTPClient(opts ...Option) *http.Client {
 	var (
-		clientOptions = msgraphsdkgo.GetDefaultClientOptions()
+		clientOptions   = msgraphsdkgo.GetDefaultClientOptions()
-		cc            = populateConfig(opts...)
+		cc              = populateConfig(opts...)
-		middlewares   = kiotaMiddlewares(&clientOptions, cc)
+		middlewares     = kiotaMiddlewares(&clientOptions, cc)
-		httpClient    = msgraphgocore.GetDefaultClient(&clientOptions, middlewares...)
+		httpClient      = msgraphgocore.GetDefaultClient(&clientOptions, middlewares...)
+		customTransport = khttp.NewCustomTransportWithParentTransport(defaultHttpTransport(), middlewares...)
 	)
 
+	httpClient.Transport = customTransport
 	httpClient.Timeout = defaultHTTPClientTimeout
 
 	cc.apply(httpClient)
@@ -163,6 +166,22 @@ func KiotaHTTPClient(opts ...Option) *http.Client {
 	return httpClient
 }
 
+func defaultHttpTransport() *http.Transport {
+	defaultTransport := khttp.GetDefaultTransport().(*http.Transport).Clone()
+
+	// default: 10 seconds
+	defaultTransport.TLSHandshakeTimeout = 30 * time.Second
+
+	// default: 30 seconds
+	nd := &net.Dialer{
+		Timeout:   60 * time.Second,
+		KeepAlive: 60 * time.Second,
+	}
+	defaultTransport.DialContext = nd.DialContext
+
+	return defaultTransport
+}
+
 // ---------------------------------------------------------------------------
 // HTTP Client Config
 // ---------------------------------------------------------------------------