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#http3

3 posts2 participants2 posts today

How browsers REALLY load Web pages

When browsers load a Web page and its subresources, A LOT happens under the hood. They need to take into account render/parsing blocking resources, use a preload scanner, listen to resource hints (like preload/preconnect), loading modifiers (async/defer/module), fetchpriority, responsive images, and much more. […]

📺 fosdem.org/2025/schedule/event

fosdem.orgFOSDEM 2025 - How browsers REALLY load Web pages
#video#web#browser

@httptoolkit This blog post is an amazing information source! thanks

There's one correction I would like to make though: configuring the open-source #nginx to use #http3 is NOT hard at all. All it needs are two things and you get a lot of the benifts of http3:

- a recent distribution (past 1.25). Included in contemporary Debian and Ubuntu.

- the configuration to use it and that leverages its advantages by pointing to static directories directly (as files).

it really speeds up!

Replied to Timo Tijhof

Scheduling HTTP Streams
by Alexander Krizhanovsky.

Understand how a web server manages millions of concurrent web requests.
* Differences in treatment for progressive JPEG vs a PNG.
* Resilient against DDoS attacks and other vulnerabilities.
* Compare Nginx, Envoy, Apache.

fosdem.org/2025/schedule/event

Live stream:
live.fosdem.org/watch/ua2220

Replied to Timo Tijhof

How browsers REALLY load Web pages by Robert Marx @programmingart

Browsers go through great lengths to workaround the fact that most web servers and major CDN provides do not honour the HTTP fetch priority correctly.

The same page has a very different waterfall in Firefox, Chrome, and Safari.

fosdem.org/2025/schedule/event

Live stream:
live.fosdem.org/watch/ua2220