上游在读取响应头时发送了HTTP/2.0响应

解决方案

1. Configure nginx to proxy using HTTP/2 by setting proxy_http_version 2.0; (requires nginx compiled with HTTP/2 support and ngx_http_v2_module):
   
   location / {
       proxy_http_version 2.0;
       proxy_pass https://upstream;  # Note: HTTPS required for HTTP/2
   }

2. If the upstream is an HTTP/2 server, configure it to also support HTTP/1.1. For example, in a Node.js server using http2 module:
   
   const http2 = require('http2');
   const http = require('http');
   
   const server = http2.createServer();
   server.on('stream', (stream, headers) => {
       stream.respond({ ':status': 200 });
       stream.end('OK');
   });
   server.listen(8080);
   
   Add an HTTP/1.1 listener on a different port if needed.

3. Use a load balancer like HAProxy that can convert HTTP/2 to HTTP/1.1:
   
   frontend http-in
       bind *:80
       default_backend servers
   
   backend servers
       server upstream1 10.0.0.1:8080 proto h2
   
   HAProxy can terminate HTTP/2 and forward as HTTP/1.1 to nginx.