Question 1

What does YouTube Error 153 mean?

Accepted Answer

YouTube Error 153 indicates that an embedded-player request is missing the HTTP Referer header or equivalent client identification that YouTube expects. Website security headers, Referrer Policy settings and the configuration of the embed can all affect whether that information is available.

Question 2

Why did the YouTube video fail on iPhones but work elsewhere?

Accepted Answer

In this case, the website had a restrictive page-level Referrer Policy while the individual YouTube iframe specified a different policy. The resulting behaviour wasn't consistent across the browsers and devices we tested, with the failure becoming apparent on iOS. Correcting the underlying page-level policy resolved the problem.

Question 3

What does strict-origin-when-cross-origin mean?

Accepted Answer

strict-origin-when-cross-origin is a Referrer Policy designed to balance functionality and privacy. When one secure website requests content from another origin, the browser can send the originating site's domain without sending the complete URL of the page the visitor is viewing. This gives services such as YouTube useful information about where a request originated while limiting unnecessary disclosure.

Question 4

Why not use a standard YouTube embed if that fixes the problem?

Accepted Answer

A standard embed may bypass privacy or consent controls built into a website's normal video implementation. In this case, doing so made the video work but undermined the site's consent configuration. The correct solution was to fix the Referrer Policy while retaining the existing privacy controls.

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Why did a YouTube video work everywhere except on iPhones?

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