Are HTTP E-Tags Bad?

HTTP ETag caching is a mechanism to validate http web cache, when server detects the tag it responds with a tiny 304 Not Modified response instead of the regular 200. They have great advantages in making web pages perform better. However they also have some cons, enough to make people shy from using them and completely strip them from their headers.

In this video will explain how E-Tags work, their pros and cons and attempt to answer the question are E-Tags bad?

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