我是编程新手，我的老板希望我在AWS弹性豆茎上部署一个dash plotly应用程序。代码已成功部署，但显示502坏网关错误。
502坏网关
nginx/1.18.0
我试图查看/var/log/nginx/error.log，并将端口更改为8000，但仍然不起作用。
这个错误的解决方案是什么？我应该添加Procfile吗？我应该在该文件中添加什么？提前感谢！
/var/log/nginx/error.log
2020/11/25 05:24:52 [error] 16068#0: *38 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:01 [error] 16068#0: *40 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:07 [error] 16068#0: *42 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:16 [error] 16545#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:22 [error] 16545#0: *3 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "dashmonitoring1-env.eba-umwfi3nn.us-east-2.elasticbeanstalk.com"
2020/11/25 05:25:22 [error] 16545#0: *5 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:22 [error] 16545#0: *3 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:8000/favicon.ico", host: "dashmonitoring1-env.eba-umwfi3nn.us-east-2.elasticbeanstalk.com", referrer: "http://dashmonitoring1-env.eba-umwfi3nn.us-east-2.elasticbeanstalk.com/"
2020/11/25 05:25:31 [error] 16545#0: *8 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:37 [error] 16545#0: *10 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:46 [error] 16545#0: *12 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:52 [error] 16545#0: *14 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:26:01 [error] 16545#0: *16 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:26:07 [error] 16545#0: *18 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
对我来说，这解决了问题https://stackoverflow.com/a/67300325/15524555。基本上，我的.eextensions/application.config文件没有正确指向dash应用程序实例。