【BW16】AT指令体验之HTTP GET POST请求

## HTTP通信 命令： ``AT+HTTPCLIENTLINE=<transport_type>,<opt>,<content-type>,<host>,<port>,<path>[,<data>]`` 参数1：``<transport_type>``请求协议(1：HTTP 2：HTTPS) 参数2：``<opt>``请求类型(2：GET 3：POST) 参数3：``<content-type>``请求数据类型，仅 POST 生效，可以填写任意字符串，参考类型如下(``application/x-www-form-urlencoded`` ``application/json`` ``multipart/form-data`` ``text/xml`` ``text/html``) 参数4：``<host>``服务器域名或 IP([www.baidu.com](www.baidu.com) 或 192.168.1.100) 参数5：``<port>``端口号(HTTP 缺省值80 HTTPS 缺省值443) 参数6：``<path>``HTTP(S)路径(缺省值”/”) 参数7：``<data>``请求携带的数据(如下) 1：当opt为GET时接在path中的，格式(?key1=value1&key2=value2 …) 2：当opt为POST时这个是POST携带的主体。 示例GET ```c AT+HTTTPCLIENTLINE=1,2,"application/x-www-form-urlencoded","httpbin.org",80,"/get?key1=123&key2=456" [AI_InitiateHttpRequest()-465]Request: GET /get?key1=123&key2=456 HTTP/1.1 Host: httpbin.org [AI_InitiateHttpRequest()-506]need send len=58 ,send succest len=58 [AI_InitiateHttpRequest()-538]curren parse data len 230 [AI_InitiateHttpRequest()-552]get bodylen=256 { "args": { "key1": "123", "key2": "456" }, "headers": { "Host": "httpbin.org", "X-Amzn-Trace-Id": "Root=1-65cf25c0-7cc21e33360f850d6c15f176" }, "origin": "118.74.161.3", "url": "http://httpbin.org/get?key1=123&key2=456" } OK [MEM] After do cmd, available heap 152032 ``` 示例POST ```c AT+HTTTPCLIENTLINE=1,3,"application/json","httpbin.org",80,"/post",{"key1": 123} [AI_InitiateHttpRequest()-486]Request: POST /post HTTP/1.1 Host: httpbin.org Content-Type: application/json Content-Length: 13 {"key1": 123} [AI_InitiateHttpRequest()-506]need send len=107 ,send succest len=107 [AI_InitiateHttpRequest()-538]curren parse data len 230 [AI_InitiateHttpRequest()-552]get bodylen=363 { "args": {}, "data": "{\"key1\": 123}", "files": {}, "form": {}, "headers": { "Content-Length": "13", "Content-Type": "application/json", "Host": "httpbin.org", "X-Amzn-Trace-Id": "Root=1-65cf2617-2251e9f04b427bc40c26c29c" }, "json": { "key1": 123 }, "origin": "118.74.161.3", "url": "http://httpbin.org/post" } OK [MEM] After do cmd, available heap 152032 ```

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