jagerzhang opened a new issue #6188:
URL: https://github.com/apache/apisix/issues/6188
### Issue description
APISIX配置中默认开启了keepalive提高性能：
```
upstream:
keepalive: 320
keepalive_requests: 1000
keepalive_timeout: 60s
```
开启后，想在特定的 upstream 中关闭keepalive, 比如尝试在upstream里面添加如下配置：
```
"keepalive_pool": {
"idle_timeout": 0,
"requests": 1000,
"size": 320
}
```
添加后，idle_timeout 会被过滤掉，最终还是用的配置里面的keepalive_timeout。
**请问下，APISIX本身就是这样设计的么？有没有办法在全局开启keepalive的情况下关闭指定upstream的keepalive？**
目前看只能反过来实现，全局关闭keepalive:
```
upstream:
keepalive: 320
keepalive_requests: 1000
keepalive_timeout: 0s # 设置为0
```
然后在需要开启的upstream中打开keepalive。
### Environment
- apisix version (cmd: `apisix version`): 2.11.0
- OS (cmd: `uname -a`): docker-centos
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