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add captcha redis storage adapter and example

muharihar

Distinguish between expired captchas and invalid submissions?

1

It seems that there is no way to do this, though it would be helpful. I'd like to alert my users with "expired captcha" or "invalid captcha" instead of just...

dasmithii

Currently, `Server`, accepts `imgWidth` and `imgHeight`. I'd like to change it to accept a configuration struct to make it easier to expand it without API change: ``` type ServerConfig struct...

dchest

'memoryStore.collect()' may run concurrently, and we can return immediately when it is collecting by checking 'numStored' value.

iwind

Can the interference lines of the captcha be removed?

1

:）

zackhsw