Punycode encoding/decoding

Punycode encoding/decoding Introduction

1. punycode is a coding system that is mainly used to convert domain names from unicode format to ascii.

2. punycode encoded strings only contain ascii characters, ensuring compatibility with existing systems.

3. punycode encoding is reversible, that is, the string encoded by punycode can be decoded back to the original non-ascii string.

4. punycode design has security in mind to prevent certain types of coding attacks.

5. since the domain name system (dns) only supports ascii characters during parsing, punycode encoding came into being.