Optimize realip.cc

Original link: https://www.bboy.app/2023/05/08/%E4%BC%98%E5%8C%96realip.cc/

Introduction

Recently realip.cc seems to be attacked, even if it is called in batches regularly, it should not be regarded as an attack. After looking at it, I feel that the supported request concurrency is still relatively rubbish, so I optimized it.

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