nanamikon opened a new issue #3565:
URL: https://github.com/apache/apisix/issues/3565
### Issue description
Relate to #3528
I think we can add a feature to customize the body when response exits.
For example, different format of json, even html
or xml , can be use to display the exit message
Refer to apisix/core/response.lua, resp_exit will be called when response
exits, I think it is a global handle for response exiting, we can't use plugin
extension here。 What about redirecting to a new uri to do the actual work ？
Add method
```
function _M.register_exit_handle_uri(uri){
handle_uri = uri
}
```
Modify apisix/core/response.lua
Add exec to redirect to error handle
```
if handle_uri then
ngx.exec(handle_uri, {code=xxx, body=yyy});
else
if idx > 0 then
ngx_print(concat_tab(t, "", 1, idx))
end
if code then
return ngx_exit(code)
end
end
```
Add new config to change this behavior
```
apisix:
exit_handle_uri:"/error_handle"
```
New uri for error handle，added by http_server_configuration_snippet
```
location = /error_handle {
content_by_lua '
local args = ngx.req.get_uri_args()
ngx.print(args.body)
return ngx.exit(args.code)
';
}
```
Some discussion about kong
1 Kong error response
https://github.com/Kong/kong/issues/3192
2 Upstream error response
https://github.com/Kong/kong/issues/972
### Environment
* apisix version (cmd: `apisix version`):2.2
* OS (cmd: `uname -a`):ubuntu 16
* OpenResty / Nginx version (cmd: `nginx -V` or `openresty -V`): 1.19
* etcd version, if have (cmd: run `curl
http://127.0.0.1:9090/v1/server_info` to get the info from server-info
API):3.4.17
* apisix-dashboard version, if have:
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