diff --git a/unum/vendor/golang.org/x/net/http2/go18.go b/unum/vendor/golang.org/x/net/http2/go18.go
new file mode 100644
index 0000000..4f30d22
--- /dev/null
+++ b/unum/vendor/golang.org/x/net/http2/go18.go
@@ -0,0 +1,56 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.8
+
+package http2
+
+import (
+	"crypto/tls"
+	"io"
+	"net/http"
+)
+
+func cloneTLSConfig(c *tls.Config) *tls.Config {
+	c2 := c.Clone()
+	c2.GetClientCertificate = c.GetClientCertificate // golang.org/issue/19264
+	return c2
+}
+
+var _ http.Pusher = (*responseWriter)(nil)
+
+// Push implements http.Pusher.
+func (w *responseWriter) Push(target string, opts *http.PushOptions) error {
+	internalOpts := pushOptions{}
+	if opts != nil {
+		internalOpts.Method = opts.Method
+		internalOpts.Header = opts.Header
+	}
+	return w.push(target, internalOpts)
+}
+
+func configureServer18(h1 *http.Server, h2 *Server) error {
+	if h2.IdleTimeout == 0 {
+		if h1.IdleTimeout != 0 {
+			h2.IdleTimeout = h1.IdleTimeout
+		} else {
+			h2.IdleTimeout = h1.ReadTimeout
+		}
+	}
+	return nil
+}
+
+func shouldLogPanic(panicValue interface{}) bool {
+	return panicValue != nil && panicValue != http.ErrAbortHandler
+}
+
+func reqGetBody(req *http.Request) func() (io.ReadCloser, error) {
+	return req.GetBody
+}
+
+func reqBodyIsNoBody(body io.ReadCloser) bool {
+	return body == http.NoBody
+}
+
+func go18httpNoBody() io.ReadCloser { return http.NoBody } // for tests only