cod-soap opened a new issue, #10450:
URL: https://github.com/apache/apisix/issues/10450
### Current Behavior
在ext-plugin-post-resp 中注册了一个golang插件，来捕获下载请求，在下载文件较大时会报错，代码片段：
（Registered a golang plugin in ext-plugin-post-resp to capture download
requests and report errors when downloading large files, code snippet）
```
func (f FileRetentionPlugin) ResponseFilter(conf interface{}, w
pkgHTTP.Response) {
...
retentionConfig := conf.(FileRetentionConfig)
if !retentionConfig.Enable {
return
}
contentType := w.Header().Get("Content-Type")
w.Header().Set("X-Content-Type", contentType)
body, err := w.ReadBody()
if err != nil {
log.Errorf("get body err:%v", err)
return
}
if !ifDownload(contentType, body) {
return
}
...
}
```
### Expected Behavior
_No response_
### Error Logs
2023-11-06T03:14:23.587Z INFO server/server.go:115 Client
connected (unix)
2023-11-06T03:14:23.587Z INFO server/server.go:115 Client
connected (unix)
2023-11-06T03:14:23.588Z INFO server/server.go:131 receive rpc
type: 4 data length: 544
2023-11-06T03:14:23.588Z INFO plugin/plugin.go:185 run plugin
file_retention_plugin
2023-11-06T03:14:23.693Z INFO http/response.go:97 receive rpc
type: 3 data length: 5680672
2023-11-06T03:14:23.696Z ERROR util/msg.go:56 read: truncated, only
get the first 219260 bytes
github.com/apache/apisix-go-plugin-runner/internal/util.ReadErr
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/util/msg.go:56
github.com/apache/apisix-go-plugin-runner/internal/http.(*Response).askExtraInfo
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/http/response.go:101
github.com/apache/apisix-go-plugin-runner/internal/http.(*Response).ReadBody
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/http/response.go:182
asdsec.com/asec/platform/app/dynamic_strategy_engine/biz/download_retained.FileRetentionPlugin.ResponseFilter
F:/code/go/src/asec-platform/asec-platform/app/dynamic_strategy_engine/biz/download_retained/retained_plugin.go:77
github.com/apache/apisix-go-plugin-runner/internal/plugin.(*responsePhase).filter
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/plugin/plugin.go:187
github.com/apache/apisix-go-plugin-runner/internal/plugin.HTTPRespCall
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/plugin/plugin.go:222
github.com/apache/apisix-go-plugin-runner/internal/server.glob..func3
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/server/server.go:55
github.com/apache/apisix-go-plugin-runner/internal/server.dispatchRPC
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/server/server.go:85
github.com/apache/apisix-go-plugin-runner/internal/server.handleConn
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/server/server.go:139
2023-11-06T03:14:23.698Z ERROR download_retained/retained_plugin.go:79
get body err:The connection is closed
asdsec.com/asec/platform/app/dynamic_strategy_engine/biz/download_retained.FileRetentionPlugin.ResponseFilter
F:/code/go/src/asec-platform/asec-platform/app/dynamic_strategy_engine/biz/download_retained/retained_plugin.go:79
github.com/apache/apisix-go-plugin-runner/internal/plugin.(*responsePhase).filter
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/plugin/plugin.go:187
github.com/apache/apisix-go-plugin-runner/internal/plugin.HTTPRespCall
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/plugin/plugin.go:222
github.com/apache/apisix-go-plugin-runner/internal/server.glob..func3
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/server/server.go:55
github.com/apache/apisix-go-plugin-runner/internal/server.dispatchRPC
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/server/server.go:85
github.com/apache/apisix-go-plugin-runner/internal/server.handleConn
F:/code/go/pkg/mod/github.com/apache/[email protected]/internal/server/server.go:139
### Steps to Reproduce
1.docker部署apisix 3.6.0
2.golang插件(0.5.0) 注册到路由
3.插件代码片段如上
4.在文件较小时，代码能够正常工作，文件较大时就会报错
（1.docker deployment apisix 3.6.0
2.golang plugin (0.5.0) register to the route
3.plugin code snippet as above
4. In the file is small, the code can work properly, when the file is large,
it will report errors）
### Environment
- APISIX version (run `apisix version`):3.6.0
- Operating system (run `uname -a`):Linux d58a11eab144 5.15.0-78-generic
Ubuntu SMP Fri Jul 7 15:25:09 UTC 2023 x86_64 GNU/Linux
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`):
- APISIX Dashboard version, if relevant:
- Plugin runner version, for issues related to plugin runners:0.5.0
- LuaRocks version, for installation issues (run `luarocks --version`):
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