一般程序写的爬虫程序都会自带请求头，不知不觉就被网站拒绝了，请求之前可以看看自己的请求头是什么，确保不被禁

地址：https://httpbin.org/

如果网站太慢打不开，想在本地搭建测试环境，可以在docker环境下启动：

$ docker run -p 80:80 kennethreitz/httpbin

不过简单测试就没必要折腾了，直接访问：https://httpbin.org/get

{
    args: { },
    headers: {
    Accept: "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
    Accept-Encoding: "gzip, deflate, br",
    Accept-Language: "zh-CN,zh;q=0.9,en;q=0.8",
    Connection: "close",
    Cookie: "_gauges_unique_day=1; _gauges_unique_month=1; _gauges_unique_year=1; _gauges_unique=1",
    Host: "httpbin.org",
    Upgrade-Insecure-Requests: "1",
    User-Agent: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36"
    },
    origin: "xxx.xxx.xx.xx",
    url: "https://httpbin.org/get"
}

关于docker的国内镜像源修改，可以参考：
https://blog.csdn.net/baidu_19473529/article/details/78126869