fix: escape original_content

[yuchanns]

str:gsub cannot correctly handle original_content if it contains certain Lua special symbols.

For example:

package main

import "strings"

func main() {
	strings.Replace("https://login.xxx.com/query?redirect=https%3A%2F%2Fxx.com", "%2F", "/", -1)
}

The problematic symbols are %2 and %3.

Let's fix this.

[yetone]

‌‌LGTM! There are some code conflicts that need to be resolved.