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[mdref/mdref-http]
/
http
/
Env
/
Response
/
setEtag.md
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# http\Env\Response http\Env\Response::setEtag(string $etag)
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Set a custom ETag.
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> ***NOTE:***
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> This will be used for caching and pre-condition checks.
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## Params:
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* string $etag
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A ETag.
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## Returns:
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* http\Env\Response, self.
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## Throws:
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* http\Exception\InvalidArgumentException