Chrome network error · -302 · HTTP

ERR_UNKNOWN_URL_SCHEME

Q: What does ERR_UNKNOWN_URL_SCHEME mean?

The URL starts with a scheme Chrome cannot open, such as intent://, whatsapp:// or market://. On Android it is common in WebView apps that do not hand these links to the right app.

The URL starts with a scheme Chrome cannot open, such as intent://, whatsapp:// or market://. On Android it is common in WebView apps that do not hand these links to the right app.

Chromium's description

The scheme of the URL is unknown.

Chrome shows it as net::ERR_UNKNOWN_URL_SCHEME, error -302. puppeteer and Playwright report the same name when a page fails to load in Chromium.

Common causes

A link to another app (mailto:, tel:, whatsapp:, intent:) opened inside an Android WebView.
A typo in the scheme, such as htps://.
A custom scheme of an app that is not installed.

How to fix ERR_UNKNOWN_URL_SCHEME

Check the start of the URL for typos.
Install the app the link is meant for.
Android developers: intercept non-http(s) links in shouldOverrideUrlLoading and start them with an Intent.

ERR_UNKNOWN_URL_SCHEME in the screenshot API

The API renders http and https URLs only; any other URL is refused with 422 before the browser starts: The url field must be a valid URL. in errors.url (or Only http and https URLs are allowed. for a well-formed URL with another scheme, such as ftp://). Links to other schemes inside the page do not affect the render.

Only the page's own load can fail a render. An image, script or frame of the page that fails with a network error does not: the page is captured as the browser shows it without that resource.

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Frequently asked questions

What does ERR_UNKNOWN_URL_SCHEME mean?

The URL starts with a scheme Chrome cannot open, such as intent://, whatsapp:// or market://. On Android it is common in WebView apps that do not hand these links to the right app.

How do I fix ERR_UNKNOWN_URL_SCHEME?

Check the start of the URL for typos.

Is a screenshot that fails with ERR_UNKNOWN_URL_SCHEME billed?

No. Requests the screenshot API answers with an error are not billed.

Other common errors

ERR_CONNECTION_RESET ERR_CONNECTION_REFUSED ERR_CONNECTION_TIMED_OUT ERR_CACHE_MISS ERR_ADDRESS_UNREACHABLE ERR_TIMED_OUT ERR_SSL_PROTOCOL_ERROR ERR_CONNECTION_CLOSED ERR_QUIC_PROTOCOL_ERROR ERR_NAME_NOT_RESOLVED ERR_TOO_MANY_REDIRECTS ERR_NETWORK_CHANGED

All 249 Chrome network errors · Screenshot API errors

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