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Why youtube-transcript-api gets blocked on servers, and what works

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Code using youtube-transcript-api can work on a laptop yet fail with RequestBlocked on cloud servers, VPSes, Colab, or CI runners. YouTube returns a 'not a bot' sign-in check to datacenter IPs instead of captions, and the library gives up quickly. In one test from a fresh cloud server, only one of ten popular videos returned captions. Two workarounds still function: routing requests through rotating residential proxies, or using a hosted transcript API so the server never contacts YouTube directly. Cookie authentication, suggested in the error message, is currently disabled in the latest release.

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