may_minihttp 0.1.11

Mini http server that implemented on top of [may](https://github.com/Xudong-Huang/may)
Documentation 
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use std::io::BufRead;

use bytes::BufMut;
use may_minihttp::{HttpServer, HttpService, Request, Response};

#[derive(Clone)]
struct HelloJson;

impl HttpService for HelloJson {
    fn call(&mut self, req: Request, rsp: &mut Response) -> std::io::Result<()> {
        let method = req.method();
        println!("method: {:?}", method);
        let mut body = req.body();
        let value: serde_json::Value = serde_json::from_slice(body.fill_buf()?)?;
        println!("value: {:?}", value);
        rsp.header("Content-Type: application/json");
        let w = rsp.body_mut().writer();

        fn get_token(value: &serde_json::Value) -> Option<&str> {
            value.as_object()?.get("token")?.as_str()
        }
        let token = get_token(&value).ok_or(std::io::ErrorKind::InvalidData)?;

        if token == "LOmCXi7MkpRozLJvLrK6fA==" {
            serde_json::to_writer(w, &serde_json::json!({ "status": "ok" }))?;
        } else {
            serde_json::to_writer(w, &serde_json::json!({ "status": "denied" }))?;
        }

        Ok(())
    }
}

// curl -v -X POST http://127.0.0.1:8080 -H 'Content-Type: application/json' -d '{"token":"LOmCXi7MkpRozLJvLrK6fA=="}'
fn main() {
    let server = HttpServer(HelloJson).start("127.0.0.1:8080").unwrap();
    server.wait();
}