griffenliu opened a new issue #1667:
URL: https://github.com/apache/apisix/issues/1667
### Issue description
I customized a plug-in for global rules,When I set the configuration
enable_debug=true, i got the follow error:
```
2020/06/08 11:40:56 [error] 15825#0: *330 failed to run body_filter_by_lua*:
/usr/local/share/lua/5.1/apisix/plugin.lua:260: headers have already been sent
stack traceback:
[C]: in function 'error'
/usr/local/share/lua/5.1/apisix/core/response.lua:90: in function
'set_header'
/usr/local/share/lua/5.1/apisix/plugin.lua:260: in function 'filter'
/usr/local/share/lua/5.1/apisix/init.lua:456: in function
'common_phase'
/usr/local/share/lua/5.1/apisix/init.lua:470: in function
'http_body_filter_phase'
body_filter_by_lua:2: in main chunk, client: ::1, server: , request:
"GET /config HTTP/1.1", host: "localhost:9080"
```
### Environment
* apisix version (cmd: `apisix version`): 1.2
* OS: Ubuntu 18.04
### Minimal test code / Steps to reproduce the issue
1. config.yaml
```
apisix:
enable_debug: true
plugins:
- my_custom_plugin
```
2. my_custom_plugin.lua
```
local core = require("apisix.core")
local plugin_name = "my_custom_plugin"
local schema = {}
local _M = {
version = 0.1,
priority = 0,
name = plugin_name,
schema = schema,
}
function _M.access(conf, ctx)
-- core.response.exit(200, "测试！！！")
-- return 200, "测试！！！"
end
return _M
```
3. set global rule:
```
curl -X PUT \
http://localhost:9080/apisix/admin/global_rules/1 \
-H 'Content-Type: application/json' \
-H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' \
-d '{
"plugins": {
"my_custom_plugin": {}
}
}'
```
### What's the actual result? (including assertion message & call stack if
applicable)
```
➜ ~ curl http://localhost:9080/config
curl: (52) Empty reply from server
```
### What's the expected result?
➜ ~ curl http://localhost:9080/config
{"error_msg":"failed to match any routes"}
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