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Update README to warn against use of Negative Captcha with caching #47

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4 changes: 4 additions & 0 deletions README.markdown
Expand Up @@ -133,6 +133,10 @@ Modify your form to include the honeypots and other fields. You can probably lea
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### Caching / Use in Production

Note that if you serve cached form markup generated with Negative Captcha and have the :spinner property in NegativeCaptcha.new set to a client-specific value, NegativeCaptcha will be unable to decode any form submission by a client other than the client used to warm the cache. Be sure to re-render all forms generated with Negative Captcha upon each request.

### Test and enjoy!

## Possible Gotchas and other concerns
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