when using the rest api you can see the browser time used for every request in the `X-Browser-Ms-Use

when using the rest api you can see the browser time used for every request in the

X-Browser-Ms-Used

X-Browser-Ms-Used

header

ah i need to update that in the docs. thanks for reminding

KKathy hmm might be an unsupported font. let me get a list of fonts we currently suppor...

Martijn•9/3/25, 8:25 AM

One example is the google font Poppins

KathyOP•9/4/25, 7:01 PM

got it, yea looks like it's not a supported font right now. would you be able to use one of the ones here instead? https://kathayl-patch-9.preview.developers.cloudflare.com/browser-rendering/reference/supported-fonts/

Cloudflare Docs

Supported fonts

Browser Rendering uses a managed Chromium environment that includes a standard set of fonts. When you generate a screenshot or PDF, text is rendered using the fonts available in this environment.

Johndoer•9/11/25, 2:29 PM

Hey i was trying to use the Rest API enpoint /content to get client side rendered content from Algolias instantsearch. I tried everything but i didn't get any items.

JJohndoer Hey i was trying to use the Rest API enpoint /content to get client side rendere...

KathyOP•9/11/25, 5:32 PM

what url/what was the request? what response did you get?

gegi•9/12/25, 2:38 PM

Hello, I want to generate url previews with opengraph meta tags but is using the browser rendering api the right approach for dynamic websites?

Diaz•Olvera•Co•9/15/25, 8:28 PM

so can I say automate some clicks for online courses

Diaz•Olvera•Co•9/15/25, 8:29 PM

something simple like everytime it autoplays to the next video I need to manually hit fullscreen

Diaz•Olvera•Co•9/15/25, 8:30 PM

or is this more a case for workers?

zegevlier•9/15/25, 8:33 PM

Browser rendering is for running a browser on the server, and from your question it looks like you more want to control a browser running on your own computer? If so, I'd recommend either looking into making a browser extension, or using selenium or puppeteer

Isaac McFadyen•9/15/25, 8:35 PM

I would recommend Selenium or Puppeteer if you're just getting started. They're easier to use.

Mmarek Hey, any WebGL updates after two months, Kathy? 🙂

KathyOP•9/16/25, 5:10 PM

we've worked on it a bit for REST API! but not working 100% of time yet (still fixing bugs). are you needing it for REST API or workers bindings?
bc if REST API, it might work for you now

Dan (Openside)•9/16/25, 8:11 PM

Any insights into time out issue: Page.printToPDF timed out. Increase the 'protocolTimeout' setting in launch/connect calls for a higher timeout if needed.

I've set the protocolTimeout to 0 in my config:
const browser = await puppeteer.launch(env.BROWSER,{
headless: 'new',
keep_alive: 600000,
args: [
"--disable-setuid-sandbox",
"--no-sandbox",
"--single-process",
"--no-zygote",
],
protocolTimeout: 0,
});

Any other suggestions for avoiding timeout.

What my app does - I pass it an HTML string, which it renders via page.setContent(html...) then it converts to PDF using page.pdf({...,timeout: 0})

DDan (Openside)Any insights into time out issue: Page.printToPDF timed out. Increase the 'proto...

Dan (Openside)•9/16/25, 9:07 PM

I switched to use the playwright provider instead of puppeteer and it loaded significantly faster with no time out, so will stick with that and likely not turn back to puppeteer

KKathy got it, yea looks like it's not a supported font right now. would you be able to...

false•9/16/25, 10:42 PM

Hi, I'm curious why custom fonts are not supported? Is there a timeline for this? This is a big blocker for me unfortunately

Kenton•9/22/25, 3:08 PM

As far as using those default supported fonts... i'm having trouble even rendering those..? Setting font-family to any of those isn't working?

gegi•9/23/25, 8:11 AM

Hello, is it possible to waitUntil "networkidle2" in the rest api?

Ggegi Hello, is it possible to waitUntil "networkidle2" in the rest api?

KathyOP•9/24/25, 10:02 AM

yep, add it like so:
{
"url": "https://open.spotify.com/artist/3c0gDdb9lhnHGFtP4prQpn",
"gotoOptions": {
"waitUntil": "networkidle2"
}
}

KKathy yep, add it like so: { "url": "https://open.spotify.com/artist/3c0gDdb9lhnHG...

gegi•9/24/25, 10:03 AM

Thank you! I will give it a try

KKathy yep, add it like so: { "url": "https://open.spotify.com/artist/3c0gDdb9lhnHG...

gegi•9/24/25, 10:04 AM

Also, if I use the rest api, will be the origin my domain?

KathyOP•9/25/25, 2:06 PM

week announcements from browser rendering!
1) Playwright support is GA
2) Stagehand support in Beta
3) higher limits so you can scale

read more + examples: https://developers.cloudflare.com/changelog/2025-09-25-br-playwright-ga-stagehand-limits/
blog: https://blog.cloudflare.com/cloudflare-developer-platform-keeps-getting-better-faster-and-more-powerful/#playwright-in-browser-rendering-is-now-ga

Cloudflare Docs

Browser Rendering Playwright GA, Stagehand support (Beta), and high...

Browser Rendering birthday week announcements

The Cloudflare Blog

Cloudflare's developer platform keeps getting better, faster, and m...

Cloudflare's deWe're making it easier for developers to build amazing things, by introducing major upgrades like external model support in AI Search (previously AutoRAG), updates to Node.js compatibility, support for larger and more concurrent container instances, and more! Plus, new tools like, transactional email, and GAed support for Workers...

xeon06•9/26/25, 4:05 PM

Would be great to have better observability, e.g. which workers caused browser rendering events in the logs. Just spent a long time trying to figure out why a worker was causing so many browser rendering hours, when it turns out it was a totally unsuspected one instead!

TWSTEvents-Dan•9/26/25, 7:44 PM

We're working on implementation of the rendering api for generating PDF files with the puppeteer provider. In evaluating this against our current solution I'm seeing that some of the custom fonts our customers use aren't supported (I've seen/reviewed the web page you guys have published for this). On that page you mention to come here to the discord to request new fonts to be supported. Before we start bombarding you with requests I wanted to get an idea for what that process and timeline looks like. For now we're going to encourage our customers to use supported fallback fonts in their CSS rules but if a particularly important customer feels strongly about something like Calibre or Open Sans - how likely is that to become supported and in what span of time?

DivMode•9/27/25, 12:51 AM

Hey guys I noticed the browser rendering api is getting detected as a bot and would like to use my own custom implementation, is there a way I can connect to my own playwright instance through websockets?

Ddandoen i just spent the day patching playwright-core, in a similar way i saw ya'll had ...

DivMode•9/27/25, 12:53 AM

Is this available anywhere? I would like to do the same so I can use my own playwright server instead of the browser rendering api

DDivMode Is this available anywhere? I would like to do the same so I can use my own play...

dandoen•9/27/25, 7:46 AM

Nope wont work cuz cloudflare workers has limitation on ws size message so even if you patch it cdp messages will be too big inside cloudflare workers see https://github.com/cloudflare/workerd/issues/4649

edit see someone else tried and wrote up way more about it:
https://github.com/cloudflare/playwright/pull/59

GitHub

Release `increase_websocket_message_size` for use on production · ...

I’m working on adding support to connecting to any arbitrary websocket chrome dev protocol server for @cloudflare/playwright (in draft cloudflare/playwright#59) but seeing errors when the incoming ...

GitHub

feat: support connecting to ws directly by danamajid · Pull Reques...

This adds support for using any ws CDP based server to connect to, without breaking existing usage of the browser rendering api. Example usage with Browserbase:
import { Browserbase } from &#39...

DivMode•9/27/25, 8:34 AM

That’s too bad, guess I’ll stick with aws lambdas for now

jepsen•9/30/25, 10:48 AM

#browser-rendering-api

TTWSTEvents-Dan We're working on implementation of the rendering api for generating PDF files wi...

KathyOP•10/1/25, 10:11 PM

oh so timely. actually just finished PR for docs to add info on how you can add your own fonts!

will be at the bottom of this page in ~10 min https://developers.cloudflare.com/browser-rendering/reference/supported-fonts/

Cloudflare Docs

Supported fonts

Browser Rendering uses a managed Chromium environment that includes a standard set of fonts. When you generate a screenshot or PDF, text is rendered using the fonts available in this environment.

welz•10/2/25, 4:16 PM

Unable to create new browser: code: 503

Got this error a few times yesterday

Wwelz Unable to create new browser: code: 503 Got this error a few times yesterday

Peps•10/2/25, 4:30 PM

Possibly related to https://www.cloudflarestatus.com/incidents/wvkqmzqz8f08.
There are still some reports of the error happening, which the team is currently taking a look at

welz•10/6/25, 9:28 AM

I've been periodically getting this error (invoking browser rendering via workers binding)

Websocket error: SessionID: <uuid> [object ErrorEvent]

Websocket error: SessionID: <uuid> [object ErrorEvent]

redacted <uuid><uuid>

Wwelz I've been periodically getting this error (invoking browser rendering via worker...

KathyOP•10/6/25, 8:16 PM

when did it start happening? and had you made any changes?

Wwelz Unable to create new browser: code: 503 Got this error a few times yesterday

welz•10/7/25, 5:25 PM

Getting this a bunch right now - is there a known issue?

Wwelz Getting this a bunch right now - is there a known issue?

Peps•10/7/25, 5:26 PM

there's a somewhat big incident going on right now, might be related: https://www.cloudflarestatus.com/incidents/ff4947s38tlb

Elevated workers KV timeouts

PPeps there's a somewhat big incident going on right now, might be related: https://ww...

KathyOP•10/7/25, 5:39 PM

yes that's it. we're working on it rn

KKathy yes that's it. we're working on it rn

Lavinx•10/7/25, 5:48 PM

I keep getting “Workers are too busy” right now. Is that because of the current downtime in the Workers KV and effecting the REST API for PDF generation too?

LLavinx I keep getting “Workers are too busy” right now. Is that because of the current ...

KathyOP•10/7/25, 6:16 PM

yes

KKathy yes

Lavinx•10/7/25, 6:17 PM

Thanks! Still receiving:

cURL error 28: Operation timed out after 30007 milliseconds with 0 bytes received (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://api.cloudflare.com/client/v4/accounts/XXXXX/browser-rendering/pdf

cURL error 28: Operation timed out after 30007 milliseconds with 0 bytes received (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://api.cloudflare.com/client/v4/accounts/XXXXX/browser-rendering/pdf

CloudFlare status mentions this issue has been resolved. Are the services being restored?

Lavinx•10/7/25, 6:25 PM

This seems to be resolved now. Back at {"success":false,"errors":[{"message":"Browser is too busy","code":2000}]}{"success":false,"errors":[{"message":"Browser is too busy","code":2000}]}

LLavinx This seems to be resolved now. Back at ``{"success":false,"errors":[{"message":"...

KathyOP•10/9/25, 6:00 PM

is this still happening? incident was resolved already

KKathy is this still happening? incident was resolved already

Lavinx•10/9/25, 7:13 PM

No, it has been resolved already. Thanks!

KKathy oh so timely. actually just finished PR for docs to add info on how you can add ...

Car1erX•10/10/25, 2:16 AM

your my hero

BlockMinister•10/10/25, 1:12 PM

hello, im constantly getting "The browser context is undefined. This means the CDP connection to the browser failed". this is for stagehand. using the following code as taken from the docs..

const stagehand = new Stagehand({
env: "LOCAL",
localBrowserLaunchOptions: { cdpUrl: endpointURLString(env.BROWSER) },
llmClient: new WorkersAIClient(env.AI),
verbose: 1,
});

await stagehand.init(); //errors here
const page = stagehand.page;

await page.goto('https://demo.playwright.dev/movies');

anyone get this working.

its being called from a CF workflow for context.

i have used the CF browser rendering successfully with pupetteer from the same project.

welz•10/12/25, 10:21 AM

Unable to create new browser: code: 503: message: No browser availableUnable to create new browser: code: 503: message: No browser available
getting this on my Workers

MisterWarung•10/12/25, 11:50 AM

Hi, hope that somebody can give me a hand: I want to develop a headless browser, where the user can browse like in a nowmal browser & can press a button to scrape the page that he sees? Is there something like that already out there that i might be capable to use or to build upon? Thx 4 the tipp

Wwelz `Unable to create new browser: code: 503: message: No browser available` getting...

kol3x•10/13/25, 8:54 AM

I also keep getting this, even though I have way less browser instances than "workers paid" allow

kol3x•10/13/25, 9:03 AM

On my browser rendering page I have "Average number of concurrent sessions - 0" and the history of browser sessions mostly have "Normal closure", but some sessions are missing "end time". Aren't they supposed to time out in 60s even if they weren't properly closed?

kol3x•10/13/25, 9:32 AM

I might be hitting this: "Rate limits are enforced with a fixed per-second fill rate. For example, a limit of 60 requests per minute translates to 1 request per second. This means you cannot send all 60 requests at once; the API expects them to be spread evenly over the minute. If your account has a custom higher limit, it will also be enforced as a per-second rate." source

Cloudflare Docs

Limits

Learn about the limits associated with Browser Rendering.

when using the rest api you can see the browser time used for every request in the `X-Browser-Ms-Use

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