nginx代理websocket

概要：

最近遇到开发使用streamlit开发的一个服务，需要通过nginx代理，发现通过nginx代理后，业务访问有问题。提示如下错误：

解决办法：
nginx配置

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''   close;
        }

server {
        listen 8501;
        server_name localhost;

        location / {
                proxy_pass http://192.168.100.144:8501/;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $http_host;
                proxy_redirect off;
        }

        location /_stcore/stream {
                proxy_pass http://192.168.100.144:8501;
                proxy_http_version 1.1;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $host;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";
                proxy_read_timeout 86400;
        }
}

streamlit配置文件修改
root@minipc:/opt/streamlit# cat ~/.streamlit/config.toml
[server]
enableCORS = false

#测试代码
root@minipc:/opt/streamlit# cat streamlit.py
import streamlit as st
x = st.slider("Select a value")
st.write(x, "squared is", x * x)


#启动服务
root@minipc:/opt/streamlit# streamlit run streamlit.py

成功加载ws