src/net/http/client.go      | 3 ++-
 src/net/http/client_test.go | 3 +++

diff --git a/src/net/http/client.go b/src/net/http/client.go
index 9231f63e65b134cf5302c66e59c7ae09c23db93f..a814cf3bdbcbf09729572f9b56e5760bc6742ddc 100644
--- a/src/net/http/client.go
+++ b/src/net/http/client.go
@@ -805,7 +805,8 @@ 		// (at least the safe ones).
 		for k, vv := range ireqhdr {
 			sensitive := false
 			switch CanonicalHeaderKey(k) {
-			case "Authorization", "Www-Authenticate", "Cookie", "Cookie2":
+			case "Authorization", "Www-Authenticate", "Cookie", "Cookie2",
+				"Proxy-Authorization", "Proxy-Authenticate":
 				sensitive = true
 			}
 			if !(sensitive && stripSensitiveHeaders) {
diff --git a/src/net/http/client_test.go b/src/net/http/client_test.go
index 1ce9539528c668dae535cf8e3bcec3dca60e951e..8ab4f58d64ce2eb6586818ed19ab75fa02a0f867 100644
--- a/src/net/http/client_test.go
+++ b/src/net/http/client_test.go
@@ -1547,6 +1547,8 @@ 	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
 		if r.Host+r.URL.Path != "a.example.com/" {
 			if h := r.Header.Get("Authorization"); h != "" {
 				t.Errorf("on request to %v%v, Authorization=%q, want no header", r.Host, r.URL.Path, h)
+			} else if h := r.Header.Get("Proxy-Authorization"); h != "" {
+				t.Errorf("on request to %v%v, Proxy-Authorization=%q, want no header", r.Host, r.URL.Path, h)
 			}
 		}
 		// Follow a chain of redirects from a to b and back to a.
@@ -1575,6 +1577,7 @@
 	req, _ := NewRequest("GET", proto+"://a.example.com/", nil)
 	req.Header.Add("Cookie", "foo=bar")
 	req.Header.Add("Authorization", "secretpassword")
+	req.Header.Add("Proxy-Authorization", "secretpassword")
 	res, err := c.Do(req)
 	if err != nil {
 		t.Fatal(err)