Simon Willison • 12/1/2025

YouTube embeds fail with a 153 error

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The article details a technical bug where YouTube video embeds failed with a 153 error due to Django's SecurityMiddleware setting a Referrer-Policy of 'same-origin'. This header suppressed the Referer value required by YouTube's embedded player. The solution was to change the policy to 'strict-origin-when-cross-origin' in Django settings, a fix assisted by GitHub Copilot.

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#Web Development #security #http headers
YouTube embeds fail with a 153 error

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