diff -r c040f992052f -r 1c52a0eeb952 vendor/google.golang.org/appengine/internal/net.go
--- a/vendor/google.golang.org/appengine/internal/net.go	Wed Sep 18 19:17:42 2019 +0200
+++ b/vendor/google.golang.org/appengine/internal/net.go	Sun Feb 16 18:54:01 2020 +0100
@@ -32,7 +32,7 @@
 
 	// Dial with a timeout in case the API host is MIA.
 	// The connection should normally be very fast.
-	conn, err := net.DialTimeout(network, addr, 500*time.Millisecond)
+	conn, err := net.DialTimeout(network, addr, 10*time.Second)
 	if err != nil {
 		limitRelease()
 		return nil, err