Title: HTTP/2 Server Push Author: Dana Ross Published: July 22, 2015 Last modified: March 25, 2018 --- Search plugins This plugin **hasn’t been tested with the latest 3 major releases of WordPress**. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress. ![](https://ps.w.org/http2-server-push/assets/icon-256x256.png?rev=1204349) # HTTP/2 Server Push By [Dana Ross](https://profiles.wordpress.org/csixty4/) [Download](https://downloads.wordpress.org/plugin/http2-server-push.1.4.zip) * [Details](https://pcd.wordpress.org/plugins/http2-server-push/#description) * [Reviews](https://pcd.wordpress.org/plugins/http2-server-push/#reviews) * [Installation](https://pcd.wordpress.org/plugins/http2-server-push/#installation) * [Development](https://pcd.wordpress.org/plugins/http2-server-push/#developers) [Support](https://wordpress.org/support/plugin/http2-server-push/) ## Description HTTP/2 is the new generation of the venerable HTTP protocol that powers the web. Among its most powerful features is _server push_, a way for web servers to send resources to the browser before it even realizes it needs them. This avoids the usual HTTP request/response cycle which happened for every script or stylesheet on a page. This plugin enables WordPress to send a `Link:<...> rel="prefetch"` header for every enqueued script and style as WordPress outputs them into the page source. Unfortunately, it can’t help plugins and themes that output their scripts directly into the page itself, but these will continue to work as they always have. Requires a web server that supports HTTP/2. ### WordPress 4.6 and above WordPress 4.6 introduced [native support for resource hints](https://make.wordpress.org/core/2016/07/06/resource-hints-in-4-6/). By default, this plugin defers to WordPress 4.6 and theme/plugin developers to responsibly prefetch the right assets. Sites running on older versions of WordPress will continue to get the previous behavior where all JavaScript and stylesheets had resource hints printed for them. I’ve added a filter To restore the old behavior (hint everything) on WordPress 4.6 and above. To use it, add this line to your theme’s functions.php file or a custom plugin: ``` `add_filter('http2_render_resource_hints', '__return_true');``` ``` ## Installation Install HTTP/2 Server Push automatically from your admin account by selecting “Plugins”, then “Add new” from the sidebar menu. Search for HTTP/2 Server Push, then choose“ Install Now”. or Download the latest HTTP/2 Server Push plugin archive from wordpress.org. Unzip the archive and upload the http2_server_push directory to the /wp-content/plugins/ directory on your WordPress site. Activate the plugin through the ‘Plugins’ menu in WordPress ## FAQ Installation Instructions Install HTTP/2 Server Push automatically from your admin account by selecting “Plugins”, then “Add new” from the sidebar menu. Search for HTTP/2 Server Push, then choose“ Install Now”. or Download the latest HTTP/2 Server Push plugin archive from wordpress.org. Unzip the archive and upload the http2_server_push directory to the /wp-content/plugins/ directory on your WordPress site. Activate the plugin through the ‘Plugins’ menu in WordPress What if my web server doesn’t support HTTP/2 or “server push”? Server push is triggered by the same mechanism as _link prefetching_, which almost all major modern browsers support over HTTP 1.x. So even if you can’t take advantage of HTTP/2’s features, people visiting your site may still get a better experience from prefetching. How do I know if this is working? There are a couple ways: 1. [nghttp](https://www.nghttp2.org/documentation/nghttp.1.html) is an HTTP/2 client that ships with the nghttp2 suite. `nghttp -v http://example.com` will show all the HTTP/2 signalling packets, HTTP headers, content, and resources sent from the server in a single request. You can see `PUSH PROMISE` signals from the server and the pushed resources after the main page is sent. 2. In Google Chrome, chrome://net-internals/#spdy will show a history of server connections from the browser. Clicking on a connection will show the discussion between the browser and the server. Within that text, you can see `PUSH PROMISE` packets and the pushed resources. How can I help with development and testing? The source code is available at [https://github.com/daveross/http2-server-push](https://github.com/daveross/http2-server-push). Issues and pull requests are welcome and encouraged! ## Reviews ![](https://secure.gravatar.com/avatar/59c3f59e8afc9de92fe14571ae8eb38379ccb98bb10bbe0fe7d15a4d7f8623bc? s=60&d=retro&r=g) ### 󠀁[Working!](https://wordpress.org/support/topic/working-172/)󠁿 [Juuso Turunen](https://profiles.wordpress.org/juusoturunen/) June 9, 2019 This plugin works very well! ![](https://secure.gravatar.com/avatar/1206c2b66182716863d4891052433039018ccf4cffc3e147f20d22f5dddb7c1f? s=60&d=retro&r=g) ### 󠀁[Works perfectly](https://wordpress.org/support/topic/works-perfectly-1658/)󠁿 [bettersecurity](https://profiles.wordpress.org/bettersecurity/) April 9, 2019 Works perfectly in conjunction with Cloudflare to deliver excellent performance ![](https://secure.gravatar.com/avatar/b63ee03527d78ff6457bfe1aedb9756dc8c783af2a37476bc4e9e3bd5eccb032? s=60&d=retro&r=g) ### 󠀁[Not enough to trigger proper HTTP2 Server Push](https://wordpress.org/support/topic/this-is-not-http2-push/)󠁿 [blablabla](https://profiles.wordpress.org/gabo13/) November 22, 2018 It’s not enough to trigger a proper HTTP2 Server Push without warnings for all preloaded resources. It needs some header checks. ![](https://secure.gravatar.com/avatar/75d6e1d5f37bcdfacaec84313f6165fa187f18b5d7d9ddd162896f7330e58ebe? s=60&d=retro&r=g) ### 󠀁[works as advertised](https://wordpress.org/support/topic/works-as-advertised-428/)󠁿 [jeduan](https://profiles.wordpress.org/jeduan/) May 23, 2017 this plugin just works. ![](https://secure.gravatar.com/avatar/c94ddea07e8ce6a25127bf19969b4c3e65b72a8eef8864b47305d95d910b15dc? s=60&d=retro&r=g) ### 󠀁[Works as advertised](https://wordpress.org/support/topic/works-as-advertised-420/)󠁿 [Daniel Chase](https://profiles.wordpress.org/riseofweb/) April 12, 2017 This plugin helped speed up my website by 33%! ![](https://secure.gravatar.com/avatar/b17f7925a299acb11b070557652fe539c997a756d1f4b6b96cd20f0edb158aa5? s=60&d=retro&r=g) ### 󠀁[Jumpin’ Geehosofats](https://wordpress.org/support/topic/jumpin-geehosofats/)󠁿 [wasanajones](https://profiles.wordpress.org/wasanajones/) November 5, 2016 Boink ! endless hours fine tuning and agonizing over my complicated site(s) with a gazillion plugins and scripts. tried every cache ever made for wordpress. different CDN’s… fire breathing VPS… without Cloudflare, and Simple Cache site loads in something like 16 seconds now using all free cloudflare, simple cache and HTTP/2 Server Push… Pingdom is telling me it loaded in UNDER 2 seconds… [ Read all 12 reviews ](https://wordpress.org/support/plugin/http2-server-push/reviews/) ## Contributors & Developers “HTTP/2 Server Push” is open source software. The following people have contributed to this plugin. Contributors * [ Dana Ross ](https://profiles.wordpress.org/csixty4/) [Translate “HTTP/2 Server Push” into your language.](https://translate.wordpress.org/projects/wp-plugins/http2-server-push) ### Interested in development? [Browse the code](https://plugins.trac.wordpress.org/browser/http2-server-push/), check out the [SVN repository](https://plugins.svn.wordpress.org/http2-server-push/), or subscribe to the [development log](https://plugins.trac.wordpress.org/log/http2-server-push/) by [RSS](https://plugins.trac.wordpress.org/log/http2-server-push/?limit=100&mode=stop_on_copy&format=rss). ## Changelog #### 1.0 * Initial release #### 1.1 * Fix errors starting the output buffer through the template_redirect action #### 1.2 * Support for protocol-relative URLs * Implemented “resource hints” to encourage preload/prefetch behavior when HTTP/ 2 support is lacking. * Fixed ‘as’ value to match latest W3C specs #### 1.3 * Doesn’t render resource hints when WordPress native support is present * No longer pushes assets on admin pages * Limits HTTP/2 Server Push headers to 4k to help alleviate 520 errors when used with Cloudflare #### 1.4 * Uses site_url instead of home_url for better WPML compatibility * Tested up to WordPress 4.9.4 ## Meta * Version **1.4** * Last updated **8 years ago** * Active installations **1,000+** * WordPress version ** 3.0 or higher ** * Tested up to **4.9.29** * Language * [English (US)](https://wordpress.org/plugins/http2-server-push/) * Tags * [http2](https://pcd.wordpress.org/plugins/tags/http2/)[performance](https://pcd.wordpress.org/plugins/tags/performance/) [prefetch](https://pcd.wordpress.org/plugins/tags/prefetch/) * [Advanced View](https://pcd.wordpress.org/plugins/http2-server-push/advanced/) ## Ratings 4.2 out of 5 stars. * [ 7 5-star reviews ](https://wordpress.org/support/plugin/http2-server-push/reviews/?filter=5) * [ 1 4-star review ](https://wordpress.org/support/plugin/http2-server-push/reviews/?filter=4) * [ 2 3-star reviews ](https://wordpress.org/support/plugin/http2-server-push/reviews/?filter=3) * [ 0 2-star reviews ](https://wordpress.org/support/plugin/http2-server-push/reviews/?filter=2) * [ 1 1-star review ](https://wordpress.org/support/plugin/http2-server-push/reviews/?filter=1) [Add my review](https://wordpress.org/support/plugin/http2-server-push/reviews/#new-post) [See all reviews](https://wordpress.org/support/plugin/http2-server-push/reviews/) ## Contributors * [ Dana Ross ](https://profiles.wordpress.org/csixty4/) ## Support Got something to say? Need help? [View support forum](https://wordpress.org/support/plugin/http2-server-push/) ## Donate Would you like to support the advancement of this plugin? [ Donate to this plugin ](http://www.giffordcatshelter.org/)