必须推荐一下这个：
https://github.com/wfrest/wfrest
功能上该有的都有，关键是简单啊！
~~~cpp
#include "wfrest/HttpServer.h"
using namespace wfrest;

int main()
{
    HttpServer svr;

    // curl -v http://ip:port/hello
    svr.GET("/hello", [](const HttpReq *req, HttpResp *resp)
    {
        resp->String("world\n");
    });
    // curl -v http://ip:port/data
    svr.GET("/data", [](const HttpReq *req, HttpResp *resp)
    {
        std::string str = "Hello world";
        resp->String(std::move(str));
    });

    // curl -v http://ip:port/post -d 'post hello world'
    svr.POST("/post", [](const HttpReq *req, HttpResp *resp)
    {
        // reference, no copy here
        std::string& body = req->body();
        fprintf(stderr, "post data : %s\n", body.c_str());
    });

    if (svr.start(8888) == 0)
    {
        getchar();
        svr.stop();
    } else
    {
        fprintf(stderr, "Cannot start server");
        exit(1);
    }
    return 0;
}
~~~
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