Chrome network error · -27 · System

ERR_BLOCKED_BY_RESPONSE

The server answered, but its response headers forbid showing it in this context, so Chrome blocked it. Typical is a page inside an iframe that sends X-Frame-Options or a frame-ancestors policy.

Chromium's description

The request failed because the response was delivered along with requirements which are not met ('X-Frame-Options' and 'Content-Security-Policy' ancestor checks and 'Cross-Origin-Resource-Policy' for instance).

Chrome shows it as net::ERR_BLOCKED_BY_RESPONSE, error -27. puppeteer and Playwright report the same name when a page fails to load in Chromium.

Common causes

X-Frame-Options: DENY or SAMEORIGIN on a page embedded in an iframe on another site.
Content-Security-Policy: frame-ancestors that does not list the embedding site.
Cross-Origin-Embedder-Policy or Cross-Origin-Resource-Policy headers that block a resource.

How to fix ERR_BLOCKED_BY_RESPONSE

Open the page directly in its own tab instead of the iframe.
Site owners: allow the embedding origin in frame-ancestors, or drop X-Frame-Options for that page.
Developers: check the console for the header that caused the block.

ERR_BLOCKED_BY_RESPONSE in the screenshot API

The API loads the URL as a top-level page, not inside an iframe, so frame headers do not block the screenshot. If an iframe inside the page is blocked, the page renders without it.

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_BLOCKED_BY_RESPONSE mean?

The server answered, but its response headers forbid showing it in this context, so Chrome blocked it. Typical is a page inside an iframe that sends X-Frame-Options or a frame-ancestors policy.

How do I fix ERR_BLOCKED_BY_RESPONSE?

Open the page directly in its own tab instead of the iframe.

Is a screenshot that fails with ERR_BLOCKED_BY_RESPONSE billed?

Usually the render is not stopped by this error: a blocked iframe is left out, and the screenshot counts like any other. Only requests the 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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