Redirect on x-forwarded-for=http in echoserver.

echoheaders/Makefile

@@ -1,7 +1,7 @@
 all: push
 
 # TAG 0.0 shouldn't clobber any release builds
-TAG = 1.2
+TAG = 1.3
 PREFIX = gcr.io/google_containers/echoserver
 
 container:

echoheaders/README.md

@@ -1,3 +1,6 @@
 # Echoserver
 
-This is a simple python http server that responds with the http headers it received, runs on port 8080.
+This is a simple server that responds with the http headers it received.
+Image versions >= 1.3 redirect requests on :80 with `X-Forwarded-Proto: http` to :443.
+Image versions > 1.0 run an nginx server, and implement the echoserver using lua in the nginx config.
+Image versions <= 1.0 run a python http server instead of nginx, and don't redirect any requests.

echoheaders/echo-app.yaml

@@ -27,6 +27,6 @@ spec:
     spec:
       containers:
       - name: echoheaders
-        image: gcr.io/google_containers/echoserver:1.2
+        image: gcr.io/google_containers/echoserver:1.3
         ports:
         - containerPort: 8080

echoheaders/nginx.conf

@@ -15,6 +15,12 @@ http {
         # socket option), allowing a kernel to distribute incoming connections between worker processes.
         listen 8080 default_server reuseport;
 
+        # Replace '_' with your hostname.
+        server_name _;
+        if ($http_x_forwarded_proto = "http") {
+            return 301 https://$host$request_uri;
+        }
+
         location / {
             lua_need_request_body on;
             content_by_lua_block {