bug: traffic-split plugin can't proxy virtual upstream that schema is https

[TenYearsIn]

Current Behavior

i have two upstream using https protocol, when i configure traffice-splite plugin on one route proxying that two upstream. i find i can not get correct response, it tells me that require "Bad Request This combination of host and port requires TLS"

Expected Behavior

i can use this route with traffice-split plugin proxy https upstream

Error Logs

apisix's response is that
Bad Request
This combination of host and port requires TLS

Steps to Reproduce

1. Run Apisix On Centos7
2. start two applications that uses tls
3. create a route curl "http://127.0.0.1:9080/apisix/admin/routes/1234567890" -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '{"uri":"/health","plugins":{"traffic-split":{"rules":[{"name":"upstream_A","type":"roundrobin","nodes":{"ip:port":10},"timeout":{"connect":15,"send":15,"read":15}}]}},"upstream": {"type": "roundrobin","nodes": {"ip:port": 2}}}'
4. invoke api curl -X GET http://127.0.0.1:9080/health

Environment

• Apisix Version(run apisix version): any version
• Operating system (run uname -a): Linux 3.10.0-957.el7.x86_64 change: added doc of how to load plugin. #1 SMP Thu Nov 8 23:39:32 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
• OpenResty / Nginx version (run openresty -V or nginx -V): nginx version: openresty/1.19.9.1
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info): 3.4.0
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):3.4.0

[tokers]

What's your APISIX version? I cannot grep the key error message.

[TenYearsIn]

Apisix. version is 2.9 . But I think my issuse description traffic-split plugin can't proxy virtual upstream that schema is https is ambiguous. Actually, When I want to create a route with traffic-split pluggin proxying two back-end applications that protocol is https . I found request has arrived to this two backend applications but the request schema is http. So this issue can description feat: traffic-split plugin can not support upstream that protocl is https

[tokers]

2.9 is too old, and the team does not maintain it. Could you try the latest version to see if this issue exists?

[TenYearsIn]

yes, The version 3.0 also has the same issue

[oyiadin]

traffic-split doesn't support specifying scheme of upstream right now

apisix/apisix/plugins/traffic-split.lua

Lines 167 to 176 in e4e7c73

	local up_conf = {
	name = upstream_info.name,
	type = upstream_info.type,
	hash_on = upstream_info.hash_on,
	pass_host = upstream_info.pass_host,
	upstream_host = upstream_info.upstream_host,
	key = upstream_info.key,
	nodes = new_nodes,
	timeout = upstream_info.timeout,
	}

I need this feature too ;-)

[TenYearsIn]

I have completed this feature, Could you assign it to me @tokers @spacewander

[Ikalinichev]

Also need this fix. Looks like traffic-split plugin can only send request to http schema.