常用配置

location /api {
    proxy_redirect off;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://192.168.1.11:8070/;
}

服务在192.168.1.11:8070的/api/路径下
如果配置8070/需要访问/api/api/才能访问到
如果配置中不带/就可以/api/访问到了
替换时location /newapi时需要配置/api，不带结尾的/
总结proxy_pass后尽量不要带/
如果不替换，配置是否带/api似乎差别不大

Access-Control-Allow-Origin是HTML5中定义的一种解决资源跨域的策略。

他是通过服务器端返回带有Access-Control-Allow-Origin标识的Response header，用来解决资源的跨域权限问题。

add_header Access-Control-Allow-Origin *;
add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';

最好不跨

https://github.com/sivel/speedtest-cli/

python speed.py --csv-header
Server ID,Sponsor,Server Name,Timestamp,Distance,Ping,Download,Upload,Share,IP Address
python speed.py --csv
5145,Beijing Unicom,Beijing,2021-01-11T04:49:04.392496Z,1.673922445212346,5.547,628723539.378605,55826659.160589784,,公网IP

python speed.py
Retrieving speedtest.net configuration...
Testing from China Unicom Beijing (公网IP)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Beijing Unicom (Beijing) [1.67 km]: 6.337 ms
Testing download speed................................................................................
Download: 625.72 Mbit/s
Testing upload speed................................................................................................
Upload: 56.08 Mbit/s

python speed.py --json
{
"client": {"rating": "0", "loggedin": "0", "isprating": "3.7", "ispdlavg": "0", "ip": "公网IP", "isp": "China Unicom Beijing", "lon": "经度", "ispulavg": "0", "country": "CN", "lat": "纬度"},
"bytes_sent": 70762496, "download": 596758926.7716337, "timestamp": "2021-01-11T04:56:33.105784Z", "share": null, "bytes_received": 409373932, "ping": 5.535, "upload": 55883940.61967305,
"server": {"latency": 5.535, "name": "Beijing", "url": "http://bj3.unicomtest.com:8080/speedtest/upload.php", "country": "China", "lon": "经度", "cc": "CN", "host": "bj3.unicomtest.com:8080", "sponsor": "Beijing Broadband Network", "lat": "纬度", "id": "5505", "d": 1.673922445212346}
}

光速30万公里/秒，地球七圈半，一圈4万公里；一圈360度，3万6公里，一度10万米（100公里）
0.00001度，万分之一度，就是10米，应该也够用了，还是用四舍五入吧
实际好像4位东西向10米，南北向20米，哪里算错了？五位小数应该是十万分之一1米，名址10米，轨迹1米（或者2-2.5米）
https://tool.yovisun.com/longlat/
两点距离：11.11946465529米
点1：纬度:40,经度:116，点2：纬度:40.0001,经度:116
两点距离：8.5184132726564米
点1：纬度:40,经度:116，点2：纬度:40,经度:116.0001

经度0.0001=8.5米，纬度0.0001=11.1米

关于四舍五入
https://www.cnblogs.com/renzhiwei/p/4229384.html

偶然发现G系列似乎资源很丰富，15元入手了一块开发板，当然还有运费，不过也感觉挺超值的
插队一下吧，就一下，巴腾项目还有20天，应该问题不大吧
项目名称G0.00-LED，CubeMX会自动下载G0包，挺快的，Keil也会下载G0包，挺慢的

HAL_GPIO_TogglePin(LED_GPIO_Port,LED_Pin);
/* Insert delay 1000 ms */
HAL_Delay(1000);

点灯很easy!也可以很省电

HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
HAL_Delay(999);
HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
HAL_Delay(1);

好啦，睡觉！