content: add HTTP/2 Server Push article

Change-Id: Ibf1214b54dee3a3419dba26367b4f0189e5e4a6d
Reviewed-on: https://go-review.googlesource.com/38603
Reviewed-by: Tom Bergan <tombergan@google.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/content/h2push/pusher.go b/content/h2push/pusher.go
new file mode 100644
index 0000000..366328c
--- /dev/null
+++ b/content/h2push/pusher.go
@@ -0,0 +1,39 @@
+// +build OMIT
+
+package main
+
+import (
+	"log"
+	"net/http"
+)
+
+func main() {
+	// START OMIT
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if pusher, ok := w.(http.Pusher); ok {
+			// Push is supported.
+			if err := pusher.Push("/app.js", nil); err != nil {
+				log.Printf("Failed to push: %v", err)
+			}
+		}
+		// ...
+	})
+	// END OMIT
+
+	// START1 OMIT
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if pusher, ok := w.(http.Pusher); ok {
+			// Push is supported.
+			options := &http.PushOptions{
+				Header: http.Header{
+					"Accept-Encoding": r.Header["Accept-Encoding"],
+				},
+			}
+			if err := pusher.Push("/app.js", options); err != nil {
+				log.Printf("Failed to push: %v", err)
+			}
+		}
+		// ...
+	})
+	// END1 OMIT
+}