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1：状态码_http
2：java访问（http）：国家气象局 免费接口
3：httpClientSocket ~~~ httpSocketServer
4：httpGet ~ httpPost
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1：状态码_http·······························································································································································
http请求的响应码一般分为五类 1xx 2xx 3xx 4xx 5xx

1xx 临时性的消息 101：当客户端问服务端支不支持http2.0的时候，如果支持服务端会返回 101 表示我支持http2.0 。
100：当客户端一个请求分多次发送给服务端的时候，就会在header里面加一个字段告诉服务端，你别急我后面还有请求，是要多个请求合并成一个请求的。服务端收到之后就会返回一个100的状态码跟客户端说好的我知道了这是一个需要多个合 并成一个的请求。

2xx 成功的提示： 200本次请求操作成功了。

3xx 重定向 301是永久重定向，永久更换服务器
302临时重定向 ，某个页面有问题需要临时修改
304 数据没有变化，刷新如果服务器数据没有返回的时候会返回。

4x