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Informations about the package laravel-http3earlyhints

Early Hints Middleware for Laravel

Early Hints is a HTTP/3 concept which allows the server to send preconnect and preload headers while it's still preparing a response. This allows the broser to start loading these resources before the server has finished building and sending a response See.

This package aims to provide the easiest experience for adding Early Hints to your responses. Simply route your requests through the AddHttp3EarlyHints middleware and it will automatically create and attach the Link headers necessary to implement Early Hints for your CSS, JS and Image assets.

Installation

You can install the package via composer:

Next you must add the \JustBetter\Http3EarlyHints\Middleware\AddHttp3EarlyHints-middleware to the kernel. Adding it to the web group is recommeneded as API's do not have assets to push.

Laravel <11

Laravel >=11

Publish config

Note: send_103 defaults to false, this is because it isn't actually supported widely yet. Currently only FrankenPHP supports Early Hints natively. default behaviour is adding the link headers to the 200 response which e.g. Cloudflare turns into early hints.

Usage

When you route a request through the AddHttp3EarlyHints middleware, the response is scanned for any link, script or img tags that could benefit from being loaded using Early Hints. These assets will be added to the Link header before sending the response to the client. Easy!

Note: To push an image asset, it must have one of the following extensions: bmp, gif, jpg, jpeg, png, svg, tiff or webp and not have loading="lazy"

Advanced usage

If the automatic detection isn't enough for you, you can listen for the GenerateEarlyHints event, and manually add/remove/change new links.

Detailed default behaviour

The information on usage is simplified, there are many checks done to make sure we don't preload the wrong things.

Early hints only support rel=preconnect and rel=preload source

We automatically transform any rel that is not preconnect or preload into preload, so your <link rel="modulepreload" href="app.js"> will get preloaded with early hints. And get more detailed information once your server starts sending it's response.

Link

Any link elements which do not have rel=

Script

Script tags will automatically get preloaded if it does not have an async or defer attribute attached to it.

Img

Img tags will automatically get preloaded when it does not have loading="lazy" and it does not exist within a picture tag.

If it is within a picture tag we may be dealing with mutliple srcsets or types, and thus cannot determine which file the browser will need. So we will not preload these images.

Object

If your html object tag contains data="" it will preload it.

Nonce

While the early hints module does support sending nonce across as well, we recommend against it. And use integrity instead.

Without hardcoding the nonce Vite::useCspNonce($nonce); sending this in early hints will be useless as each request will send early hints with a stale nonce.

Testing

Contributing

Please see CONTRIBUTING for details.

License

The MIT License (MIT). Please see License File for more information.

All versions of laravel-http3earlyhints with dependencies

PHP Build Version
Package Version
Requires php Version ^8.0
laravel/framework Version ^10.0|^11.0|^12.0
fig/link-util Version ^1.2
psr/link Version ^1.1.1 || ^2.0.1
symfony/dom-crawler Version ^6.0|^7.0
symfony/css-selector Version ^6.0|^7.0
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