help request: proxy-rewrite plugin does not support grpc header rewrite?

[jujiale]

Description

hello
I want to use proxy-rewrite to rewrite grpc header "host", then proxy it to gprc service in upstream. but I find that proxy-rewrit does not support

the config is below:
`

{
  "uri": "/helloworld.Greeter/SayHello",
  "name": "grpc-grpc",
  "methods": [
    "POST",
    "GET"
  ],
  "plugins": {
    "proxy-rewrite": {
      "headers": {
        "host": "111.222.333.444"
      },
      "host": "111.222.333.444"
    }
  },
  "upstream": {
    "nodes": [
      {
        "host": "172.25.xxx.xxx",
        "port": 50051,
        "weight": 1
      }
    ],
    "timeout": {
      "connect": 6,
      "send": 6,
      "read": 6
    },
    "type": "roundrobin",
    "scheme": "grpc",
    "pass_host": "pass",
    "keepalive_pool": {
      "idle_timeout": 60,
      "requests": 1000,
      "size": 320
    }
  },
  "status": 1
}

`

Environment

• APISIX version (run apisix version):2.12.0
• Operating system (run uname -a):Linux 3.10.0-957.21.3.el7.x86_64
• OpenResty / Nginx version (run openresty -V or nginx -V):openresty/1.21.4.1
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):3.5.0
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):

[tzssangglass]

fixed by: #7939

[jujiale]

fixed by: #7939

@tzssangglass Thanks very much