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Puppeteer checks whether a browser provider handles the requested browser, platform, and build ID before it asks that provider for a download URL. A positive supports result is not proof that the archive exists or that its browser binary will run with your Puppeteer version: those are separate checks.
What Puppeteer checks
The installation flow passes a requested browser, platform, and build ID to each provider. The provider’s supports method answers whether it handles that browser/platform combination. As the implementation comment puts it, the check is: “does this provider support this browser/platform?” Puppeteer’s install implementation shows this sequence.
This is a provider-capability decision, not a test that launches a browser, validates a binary, or proves the requested archive is available. The build ID is also passed through the provider flow, so a provider still needs to supply a usable URL for the requested build.
How the installation flow proceeds
- Choose a platform. If the caller does not specify one, Puppeteer attempts automatic platform detection. If it cannot determine a platform, installation throws an error instead of proceeding with a download.
- Build the provider sequence. Supplied providers are considered first. If a
baseUrlis supplied, Puppeteer adds aDefaultProviderconfigured with that URL. The ordinary default provider is appended when there is nobaseUrl, or whenforceFallbackForTestingis enabled. - Call
supports. Puppeteer provides the browser, platform, and build ID to the current provider. - Skip unsupported providers. If
supportsreturnsfalse, Puppeteer continues to the next provider. - Ask for a download URL. A supported provider is asked for a URL. If it returns
null, the next provider is tried. If it returns a URL, Puppeteer attempts installation from it. - Continue after installation errors. Failures are recorded and the flow tries later providers. If all providers fail, Puppeteer throws an error reporting the provider failures.
These behaviors are described in the implementation for installation and provider options. The repository link points to the mutable main branch, so details may change; check the source matching your installed release when debugging version-specific behavior.
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Do not confuse provider support, download availability, and compatibility
| Question | What answers it | What it does not establish |
|---|---|---|
| Does this provider handle the requested browser and platform? | The provider’s supports result. |
That a download URL exists, responds, or contains a runnable binary. |
| Can a download URL be reached? | canDownload checks provider support, obtains a URL, then makes an HTTP HEAD request. It returns true when one such check succeeds. |
That the binary is compatible with your Puppeteer release or will launch successfully. |
| Which browser version is documented for this Puppeteer release? | The release-to-browser mapping in Puppeteer’s supported browsers guide. | That a different browser version, provider, or binary is covered by the same compatibility statement. |
Use canDownload when you need the separate URL-availability check; a successful supports result alone does not perform it. The check is documented in the implementation of canDownload.
What changes with custom providers or a base URL
Provider order matters
Because providers are checked in sequence, a supplied provider can handle a request before the default fallback is reached. A provider that declines through supports, returns no URL, or fails during installation allows the flow to continue, subject to the provider list and fallback configuration.
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A supplied baseUrl changes the fallback
A baseUrl adds a default provider configured to use that URL. In the ordinary arrangement, Puppeteer does not also append the unconfigured default provider when a baseUrl is supplied. Setting forceFallbackForTesting enables that ordinary default provider as an additional fallback. See the provider options in the install source.
Custom-provider support is not a Puppeteer guarantee
Puppeteer’s API documentation says custom providers are not officially supported. Users are responsible for binary compatibility, testing, and maintenance; Puppeteer tests and guarantees compatibility with its default binaries. So a custom provider returning true means that provider says it can handle the request—not that Puppeteer guarantees its binary will work. Puppeteer’s API documentation describes the provider model and compatibility caveat.
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Check browser-version compatibility separately
Puppeteer downloads and uses a specific Chrome version by default. Its configuration guide also documents using another Chrome or Chromium executable by setting an executable path. Read the configuration guide for the applicable settings.
The installation guide says Puppeteer automatically downloads a compatible Chrome for Testing version and a chrome-headless-shell binary; the latter has been included since Puppeteer v21.6.0. It identifies $HOME/.cache/puppeteer as the default browser cache location beginning with v19.0.0. These are version-scoped documented defaults, not guarantees for every setup. Check the installation guide for your release and environment.
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For a compatibility question, consult the supported-browser table for the exact Puppeteer release you installed. Its mappings change over time. The guide says that if an exact Puppeteer version is absent, use the browser version listed for the immediately prior Puppeteer release; do not treat a mapping for another release as universal. See the supported-browser mapping.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Diagnose a skipped or failed provider
- The provider is skipped immediately: inspect its
supportslogic and confirm it accepts the requested browser and platform. Also confirm that platform detection succeeded or pass the intended platform explicitly. - The provider says it supports the request but installation moves on: check whether it returned a URL for the requested build ID. A null URL advances to the next provider.
- The URL is returned but download fails: provider support does not guarantee reachability. Use
canDownloadto perform its HTTPHEADavailability check, then investigate the URL or network failure reported during installation. - A custom binary downloads but does not work: verify compatibility against the supported-browser table for the installed Puppeteer release and test the custom binary yourself; custom-provider compatibility is not guaranteed by Puppeteer.
- The expected fallback is absent: review whether
baseUrlwas supplied and whetherforceFallbackForTestingis enabled. The former changes which default provider is appended. - Installation fails after all providers: read the reported provider failures in order. Each earlier provider may have been skipped, returned no URL, or encountered an installation error.
Or skip the browser setup
If the task is simply to capture a webpage rather than manage Puppeteer binaries, ScreenshotNeo provides a one-request screenshot API. ScreenshotNeo returns a clean PNG, JPEG, WebP, or PDF; the following cURL example requests a WebP screenshot:
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp
See the ScreenshotNeo API documentation for request options. It accepts cookie/consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture, with each step configurable. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed; response headers identify the page verdict and billing status. Its MCP server gives AI agents tools for screenshots, page information, and PDFs. The free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for 1,000 free screenshots a month with no card.
Frequently Asked Questions
Does supports confirm the browser can launch?
No. It indicates whether the provider handles the requested browser/platform combination. It does not launch or validate the binary.
Does Puppeteer check whether a provider’s download URL exists?
Not as part of the supports decision. The separate canDownload function obtains a URL and checks it with an HTTP HEAD request.
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