Add HTML to list of static content files to Varnish VCL

Author: Paavo Pokkinen

app/code/Magento/PageCache/etc/varnish3.vcl

@@ -62,7 +62,7 @@ sub vcl_recv {
     std.collect(req.http.Cookie);
 
     # static files are always cacheable. remove SSL flag and cookie
-    if (req.url ~ "^/(pub/)?(media|static)/.*\.(ico|css|js|jpg|jpeg|png|gif|tiff|bmp|gz|tgz|bz2|tbz|mp3|ogg|svg|swf|woff|woff2|eot|ttf|otf)$") {
+    if (req.url ~ "^/(pub/)?(media|static)/.*\.(ico|html|css|js|jpg|jpeg|png|gif|tiff|bmp|gz|tgz|bz2|tbz|mp3|ogg|svg|swf|woff|woff2|eot|ttf|otf)$") {
         unset req.http.Https;
         unset req.http./* {{ ssl_offloaded_header }} */;
         unset req.http.Cookie;

app/code/Magento/PageCache/etc/varnish4.vcl

@@ -74,7 +74,7 @@ sub vcl_recv {
     set req.url = regsuball(req.url,"&gclid=[^&]+",""); # strips when QS = "?foo=bar&gclid=AAA" or QS = "?foo=bar&gclid=AAA&bar=baz"
 
     # static files are always cacheable. remove SSL flag and cookie
-        if (req.url ~ "^/(pub/)?(media|static)/.*\.(ico|css|js|jpg|jpeg|png|gif|tiff|bmp|mp3|ogg|svg|swf|woff|woff2|eot|ttf|otf)$") {
+        if (req.url ~ "^/(pub/)?(media|static)/.*\.(ico|html|css|js|jpg|jpeg|png|gif|tiff|bmp|mp3|ogg|svg|swf|woff|woff2|eot|ttf|otf)$") {
         unset req.http.Https;
         unset req.http./* {{ ssl_offloaded_header }} */;
         unset req.http.Cookie;