bug: graphql post request route matching exception

[AlinsRan]

Current Behavior

Graphql post requests have a probability of causing routing matching exception.

The larger the body, the greater the probability of routing exceptions, which may be affected by other requests in the final result.

• expect
  POST http://test.com/hello -> route a
  POST http://test2.com/hello -> rout b

• actual
  POST http://test.com/hello -> route a
  POST http://test2.com/hello -> route a

Expected Behavior

No response

Error Logs

No response

Steps to Reproduce

1. apisix configure config.yaml

deployment:
  role: data_plane
  role_data_plane:
    config_provider: yaml

apisix:
  router:
    http: radixtree_uri

nginx_config:
  worker_processes: 1

2. apisix.yaml configure

routes:
 - uri: "/hello"
   hosts:
     - test.com
   vars:
     - - "graphql_name"
       - "=="
       - "createAccount"
   priority: 30
   id: "graphql1"
   upstream_id: "invalid"

 - uri: "/hello"
   hosts:
     - test.com
   plugins:
     echo:
       body: "test server\n"
   priority: 20
   id: "graphql2"
   upstream_id: "invalid"
 
 - uri: "/hello"
   hosts:
     - test2.com
   plugins:
     echo:
       body: "test2\n"
   priority: 20
   id: "graphql3"
   upstream_id: "invalid"

upstreams:
 - nodes:
     127.0.0.1:1999: 1
   id: "invalid"
   ```
   
3. request params

```shell
➜  apisix git:(master) ✗ curl -Z http://test.com:9080/hello -H "Content-Type: application/json" -X POST -d @schema.json -Z http://test2.com:9080/hello
test2
test2
➜  apisix git:(master) ✗ curl -Z http://test.com:9080/hello -H "Content-Type: application/json" -X POST -d @schema.json -Z http://test2.com:9080/hello
test2
test server
➜  apisix git:(master) ✗ curl -Z http://test.com:9080/hello -H "Content-Type: application/json" -X POST -d @schema.json -Z http://test2.com:9080/hello
test2
test2
➜  apisix git:(master) ✗ curl -Z http://test.com:9080/hello -H "Content-Type: application/json" -X POST -d @schema.json -Z http://test2.com:9080/hello
test2
test2

Environment

• APISIX version (run apisix version): master/3.5.0
• Operating system (run uname -a):
• OpenResty / Nginx version (run openresty -V or nginx -V):
• 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):