reqwest 的性能为啥这么差？

1. reqwest

#[macro_use]
extern crate timeit;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    timeit!({
        let _ = reqwest::blocking::get("http://localhost/")?
            .text()?;
    });
    Ok(())
}

2. chttp

use chttp::prelude::*;

#[macro_use]
extern crate timeit;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    timeit!({
        let _ = chttp::get("http://localhost/")?
            .text()?;
    });
    Ok(())
}

3. python requests

import requests
%timeit requests.get('http://localhost/').text

输出：

1. reqwest 10 loops: 40.283526 ms

2. chttp 1000 loops: 264.017153 µs

3. requests 1.56 ms ± 27 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

reqwest 换成 http1.0 协议也不变

localhost 是本地 nginx

这性能比 python requsts 都慢了几十倍，有点夸张