Revert "improve performance for http upload"
Revert "improve performance for http upload"

This reverts commit cddf74334df985ee7ca19978c72b6357c43efae8.

panzer13/v2ray-core,panzer13/v2ray-core,v2ray/v2ray-core,Amonhuz/v2ray-core,v2ray/v2ray-core,simpleman1984/v2ray-core,LiuWenJu/v2ray-core,simpleman1984/v2ray-core,LiuWenJu/v2ray-core,Amonhuz/v2ray-core,simpleman1984/v2ray-core