go - 验证码超时

Question

为什么我需要验证码超时实现。它有什么用处？

github上看golang验证码link ，这里的过期时间是10分钟。程序员出于什么原因实现了验证码的过期时间。

Answer 1

package captcha

import "github.com/dchest/cap

To make captchas one-time, the package includes a memory storage that stores captcha ids, their solutions, and expiration time. Used captchas are removed from the store immediately after calling Verify or VerifyString, while unused captchas (user loaded a page with captcha, but didn't submit the form) are collected automatically after the predefined expiration time.

阅读 captcha 包文档。