jinnyu opened a new issue, #7352:
URL: https://github.com/apache/apisix/issues/7352
### Current Behavior
`http-logger` lua report error.
### Expected Behavior
Send the request to the configured service correctly
### Error Logs
```
2022/06/29 17:20:13 [error] 49#49: *1586203 failed to run log_by_lua*:
/usr/local/apisix/apisix/utils/log-util.lua:46: attempt to call method 'byte'
(a nil value)
stack traceback:
/usr/local/apisix/apisix/utils/log-util.lua:46: in function
'create_obj_fun'
/usr/local/apisix/apisix/core/lrucache.lua:95: in function
'lru_log_format'
/usr/local/apisix/apisix/utils/log-util.lua:57: in function
'get_custom_format_log'
/usr/local/apisix/apisix/plugins/http-logger.lua:167: in function
'phase_func'
/usr/local/apisix/apisix/plugin.lua:771: in function 'run_plugin'
/usr/local/apisix/apisix/plugin.lua:804: in function
'run_global_rules'
/usr/local/apisix/apisix/init.lua:311: in function 'common_phase'
/usr/local/apisix/apisix/init.lua:710: in function 'http_log_phase'
log_by_lua(nginx.conf:328):2: in main chunk while logging request,
client: 172.17.132.35, server: _, request: "GET /rest/2.0/ocr/v1/idcard
HTTP/1.1", upstream: "https://somehost.com";, host: "10.26.20.220:4006"
```
### Steps to Reproduce
1. enable `http-logger` globally
2. plugin config
```
{
"concat_method": "new_line",
"disable": false,
"include_req_body": true,
"include_resp_body": true,
"uri": "report server"
}
```
`log_format` config
```
{
"log_format": {
"streams": [
{
"stream": {
"serviceName": "$service_name",
"routeName": "$route_name",
"host": "$host",
"balancer": "$balancer_ip:$balancer_port"
},
"values": [
[
"$msec",
"{\"ts\":\"$msec\",\"status\":\"$status\",\"request\":{\"ua\":\"$http_user_agent\",\"body-size\":\"$body_bytes_sent\",\"request\":\"$request\"},\"upstream\":{\"addr\":\"$upstream_addr\",\"host\":\"$upstream_host\",\"uri\":\"$upstream_uri\",\"status\":\"$upstream_status\",\"responseTime\":\"$upstream_response_time\"}}"
]
]
}
]
}
}
```
3. do request to apisix
**if enable plugin only, no `log_format` config, plugin can work correctly
with default format,**
**but when `log_format` is configured, an error will be reported**
### Environment
- APISIX version (run `apisix version`): 2.13.0 and 2.14.1
- Operating system (run `uname -a`): offical docker image
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`): 3.14.8
- APISIX Dashboard version, if relevant: 2.13
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):
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