Sn0rt commented on issue #9661:
URL: https://github.com/apache/apisix/issues/9661#issuecomment-1630201684

   # the test case for reproduce 
   
   ```lua
   #
   # Licensed to the Apache Software Foundation (ASF) under one or more
   # contributor license agreements.  See the NOTICE file distributed with
   # this work for additional information regarding copyright ownership.
   # The ASF licenses this file to You under the Apache License, Version 2.0
   # (the "License"); you may not use this file except in compliance with
   # the License.  You may obtain a copy of the License at
   #
   #     http://www.apache.org/licenses/LICENSE-2.0
   #
   # Unless required by applicable law or agreed to in writing, software
   # distributed under the License is distributed on an "AS IS" BASIS,
   # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   # See the License for the specific language governing permissions and
   # limitations under the License.
   #
   use t::APISIX;
   
   my $nginx_binary = $ENV{'TEST_NGINX_BINARY'} || 'nginx';
   my $version = eval { `$nginx_binary -V 2>&1` };
   
   if ($version !~ m/\/apisix-nginx-module/) {
       plan(skip_all => "apisix-nginx-module not installed");
   } else {
       plan('no_plan');
   }
   
   $ENV{TEST_NGINX_REDIS_PORT} ||= 1985;
   
   add_block_preprocessor(sub {
       my ($block) = @_;
   
       if (!$block->extra_yaml_config) {
           my $extra_yaml_config = <<_EOC_;
   xrpc:
     protocols:
       - name: redis
   _EOC_
           $block->set_value("extra_yaml_config", $extra_yaml_config);
       }
   
   
       if (!defined $block->request) {
           $block->set_value("request", "GET /t");
       }
   
       $block;
   });
   
   worker_connections(1024);
   run_tests;
   
   __DATA__
   
   === TEST 1: init
   --- config
       location /t {
           content_by_lua_block {
               local t = require("lib.test_admin").test
               local code, body = t('/apisix/admin/stream_routes/1',
                    ngx.HTTP_PUT,
                    [[{
                       "plugins": {
                           "limit-conn": {
                               "conn": 2,
                               "burst": 1,
                               "default_conn_delay": 0.1,
                               "key": "$remote_port $server_addr",
                               "key_type": "var_combination"
                           }
                       },
                       "upstream": {
                           "type": "none",
                           "nodes": {
                             "127.0.0.1:6379": 1
                           }
                         },
                         "protocol": {
                           "name": "redis"
                         }
                   }]]
                   )
   
               if code >= 300 then
                   ngx.status = code
               end
               ngx.say(body)
           }
       }
   --- response_body
   passed
   
   
   
   === TEST 2: hit
   --- config
       location /t {
           content_by_lua_block {
               local redis = require "resty.redis"
               local red = redis:new()
   
               local ok, err = red:connect("127.0.0.1", $TEST_NGINX_REDIS_PORT)
               if not ok then
                   ngx.say("failed to connect: ", err)
                   return
               end
   
               local res, err = red:hmset("animals", "dog", "bark", "cat", 
"meow")
               if not res then
                   ngx.say("failed to set animals: ", err)
                   return
               end
               ngx.say("hmset animals: ", res)
   
               local res, err = red:hmget("animals", "dog", "cat")
               if not res then
                   ngx.say("failed to get animals: ", err)
                   return
               end
               ngx.say("hmget animals: ", res)
   
               ok, err = red:close()
               if not ok then
                   ngx.say("failed to close: ", err)
                   return
               end
           }
       }
   --- error_log
   attempt to perform arithmetic on field 'request_time'
   --- stream_conf_enable
   
   ```
   
   and 
   
   ```shell
   $ prove -I. -I../test-nginx/inc -I../test-nginx/lib -r 
t/stream-plugin/limit-conn2.t
   t/stream-plugin/limit-conn2.t .. ok
   All tests successful.
   Files=1, Tests=5,  1 wallclock secs ( 0.01 usr  0.00 sys +  0.21 cusr  0.08 
csys =  0.30 CPU)
   Result: PASS
   ```


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