jiang4357291 opened a new issue #1204:
URL: https://github.com/apache/incubator-brpc/issues/1204
**Describe the bug (描述bug)**
利用brpc实现了的http server，然后用client去访问，发现有时候client拿到的response attachment为空，
但是service处却发现response不为空，具体代码依赖较多也不便展示，想请问下可以从什么思路去排查？
**To Reproduce (复现方法)**
**Expected behavior (期望行为)**
**Versions (各种版本)**
OS:debian 9
Compiler:g++ 6.3.0
brpc:
protobuf:
**Additional context/screenshots (更多上下文/截图)**
service侧接口最后调用os.move_to(cntl->response_attachment())后打印cntl->response_attachment()->to_string()有如下内容：{"err_msg":"","err_code":0}
channel侧打印cntl.response_attachment().to_string()为空
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