bug: The plain HTTP request was sent to HTTPS port [traffic-split]

[Ikalinichev]

Description

Hi!
I have a problem combining two plugins: proxy-rewrite and traffic-split , in order to proxy requests to an https upstream. Below is the config. While I'am using only proxy-rewrite plugin ( traffic-split is deleted from the config) it works fine.
With traffic-split I get:

<title>400 The plain HTTP request was sent to HTTPS port</title> and as I can see in the log it sends request to "http://http-gateway.prodlike.dc.mts.ru" Does traffic-split work with https? What I am doing wrong?

{
    "uri": "/test1",
    "methods": ["POST"],
     "plugins": {
	"proxy-rewrite": {
            "_meta": {
                "filter": [["http_x-mts-msisdn","!","in",
                ["lemon","apple","bean"]]]},
            "uri": "/test2",
	    "scheme": "https"
        },
        "traffic-split": {
            "rules": [
                {"match": [{"vars": [["http_x-mts-msisdn","!","in",
                ["lemon","apple","bean"]]]}],
                    "weighted_upstreams": [
                        {
                            "upstream": {
                                "name": "upstream-A",
                                "scheme": "https",
				"pass_host": "node",
                                "nodes": {
                                    "http-gateway.test.com:443":1
                                }
                            },
                            "weight": 3
                        }
                    ]
                }
            ]
        }
    },
	"upstream": {
        "pass_host": "node",
        "scheme": "https",
        "nodes": {
            "http-gateway.test.com:443":1
        }
    }
}

Environment

• APISIX version (run apisix version): 3.2.0
• Operating system (run uname -a): Linux apisix-6d8d48b4c5-c2xxc 5.4.0-81-generic
• OpenResty / Nginx version (run openresty -V or nginx -V):
  -nginx version: openresty/1.21.4.1
  built by gcc 9.3.1 20200408 (Red Hat 9.3.1-2) (GCC)
  built with OpenSSL 1.1.1s 1 Nov 2022
  TLS SNI support enabled
  configure arguments: --prefix=/usr/local/openresty/nginx --with-cc-opt='-O2 -DAPISIX_BASE_VER=1.21.4.1.7 -DNGX_GRPC_CLI_ENGINE_PATH=/usr/local/openresty/libgrpc_engine.so -DNGX_HTTP_GRPC_CLI_ENGINE_PATH=/usr/local/openresty/libgrpc_engine.so -DNGX_LUA_ABORT_AT_PANIC -I/usr/local/openresty/zlib/include -I/usr/local/openresty/pcre/include -I/usr/local/openresty/openssl111/include' --add-module=../ngx_devel_kit-0.3.1 --add-module=../echo-nginx-module-0.62 --add-module=../xss-nginx-module-0.06 --add-module=../ngx_coolkit-0.2 --add-module=../set-misc-nginx-module-0.33 --add-module=../form-input-nginx-module-0.12 --add-module=../encrypted-session-nginx-module-0.09 --add-module=../srcache-nginx-module-0.32 --add-module=../ngx_lua-0.10.21 --add-module=../ngx_lua_upstream-0.07 --add-module=../headers-more-nginx-module-0.33 --add-module=../array-var-nginx-module-0.05 --add-module=../memc-nginx-module-0.19 --add-module=../redis2-nginx-module-0.15 --add-module=../redis-nginx-module-0.3.9 --add-module=../ngx_stream_lua-0.0.11 --with-ld-opt='-Wl,-rpath,/usr/local/openresty/luajit/lib -Wl,-rpath,/usr/local/openresty/wasmtime-c-api/lib -L/usr/local/openresty/zlib/lib -L/usr/local/openresty/pcre/lib -L/usr/local/openresty/openssl111/lib -Wl,-rpath,/usr/local/openresty/zlib/lib:/usr/local/openresty/pcre/lib:/usr/local/openresty/openssl111/lib' --add-module=/tmp/tmp.xYfSxgSEeh/openresty-1.21.4.1/../mod_dubbo-1.0.2 --add-module=/tmp/tmp.xYfSxgSEeh/openresty-1.21.4.1/../ngx_multi_upstream_module-1.1.1 --add-module=/tmp/tmp.xYfSxgSEeh/openresty-1.21.4.1/../apisix-nginx-module-1.12.0 --add-module=/tmp/tmp.xYfSxgSEeh/openresty-1.21.4.1/../apisix-nginx-module-1.12.0/src/stream --add-module=/tmp/tmp.xYfSxgSEeh/openresty-1.21.4.1/../apisix-nginx-module-1.12.0/src/meta --add-module=/tmp/tmp.xYfSxgSEeh/openresty-1.21.4.1/../wasm-nginx-module-0.6.4 --add-module=/tmp/tmp.xYfSxgSEeh/openresty-1.21.4.1/../lua-var-nginx-module-v0.5.3 --add-module=/tmp/tmp.xYfSxgSEeh/openresty-1.21.4.1/../grpc-client-nginx-module-v0.4.2 --with-poll_module --with-pcre-jit --with-stream --with-stream_ssl_module --with-stream_ssl_preread_module --with-http_v2_module --without-mail_pop3_module --without-mail_imap_module --without-mail_smtp_module --with-http_stub_status_module --with-http_realip_module --with-http_addition_module --with-http_auth_request_module --with-http_secure_link_module --with-http_random_index_module --with-http_gzip_static_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-threads --with-compat --with-stream --with-http_ssl_module
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):

[Ikalinichev]

That works for me
#8996