singhajitk opened a new issue, #13002:
URL: https://github.com/apache/apisix/issues/13002
### Current Behavior
### Issue Description
HTTP2 protocol is not working when `ApisixUpstream` spec `scheme` is set to
`https`. The upstream connection does not utilize HTTP2 even though the backend
service supports it.
### Actual Behavior
- ApisixUpstream is configured with `scheme: https`
- HTTP2 protocol is not being used for upstream connections
- Traffic defaults to HTTP/1.1 instead of HTTP2
- No HTTP2 negotiation occurs despite backend service supporting HTTP2
### Expected Behavior
### Expected Behavior
When `scheme: https` is configured in ApisixUpstream, APISIX should
automatically negotiate and use HTTP2 protocol for upstream connections if the
backend service supports it via ALPN (Application-Layer Protocol Negotiation).
### Error Logs
### No specific errors
### Steps to Reproduce
### Steps to Reproduce
1. Create an ApisixUpstream resource with `scheme: https`
2. Configure a backend service that supports HTTP2 over TLS
3. Send requests through APISIX to the upstream
4. Observe protocol being used (HTTP/1.1 instead of HTTP2)
### Configuration Example
```yaml
apiVersion: apisix.apache.org/v2
kind: ApisixUpstream
metadata:
name: example-apisixupstream
spec:
scheme: https
discovery:
type: kubernetes
serviceName: namespace/service-name:http
retries: 0
timeout:
connect: 150s
send: 150s
read: 150s
### Environment
- APISIX version (run `apisix version`): 3.13.0
- Operating system (run `uname -a`): Linux
apisix-data-plane-567765b759-6np8s 6.8.0-87-generic #88~22.04.1-Ubuntu SMP
PREEMPT_DYNAMIC Tue Oct 14 14:03:14 UTC 2 x86_64 GNU/Linux
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`): nginx
version: openresty/1.27.1.2 built with OpenSSL 3.4.1 11 Feb 2025
- etcd version, if relevant (run `curl
[http://127.0.0.1:9090/v1/server_info`):](http://127.0.0.1:9090/v1/server_info%60):)
3.6.0
- APISIX Dashboard version, if relevant: 3.0.1
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):
3.12.0
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