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I am applying etag for all the responses but want to know whether to apply etag for the responses with status 4xx or 5xx

gursharan singh
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  • Why do you want to apply the `ETag` to client or server error pages? The client/browser is not requesting error pages. – Progman Apr 05 '21 at 11:15

1 Answers1

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The specification describes When to Use Entity-Tags and Last-Modified Dates:

In 200 (OK) responses to GET or HEAD, an origin server SHOULD send an entity-tag validator...

So, no, there is no reason to send ETags for 4xx or 5xx responses. Those codes indicate that a valid response could not be generated; therefore, there is no representation that the ETag could meaningfully apply to.

Community
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Kevin Christopher Henry
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