http2 (#22379)

docker/main/build_nginx.sh

@@ -73,6 +73,7 @@ cd /tmp/nginx
     --with-file-aio \
     --with-http_sub_module \
     --with-http_ssl_module \
+    --with-http_v2_module \
     --with-http_auth_request_module \
     --with-http_realip_module \
     --with-threads \

docker/main/rootfs/usr/local/nginx/conf/nginx.conf

@@ -63,6 +63,9 @@ http {
     server {
         include listen.conf;
 
+        # enable HTTP/2 for TLS connections to eliminate browser 6-connection limit
+        http2 on;
+
         # vod settings
         vod_base_url '';
         vod_segments_base_url '';