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| <!-- | |
| Description: The following is the example code to use recaptcha. | |
| Notice: The function backend_API_challenge is the concept and you should implement it on the backend. | |
| Especially, you must keep your secret key in private all the time. | |
| Flow: | |
| 1. Click the submit button. | |
| 2. On the console, execute backend_API_challenge function. | |
| --> | |
| <html> | |
| <head> |