您必须重新使用相同的curl句柄:请参见

You must re-use the same curl handle: see this similar question for more details.

就多接口而言，您还需要显式重用每个句柄以利用摘要访问身份验证请求计数器，即，牢记C API:

As far as the multi interface is concerned you also need to explicitly reuse each handle to leverage the Digest Access Authentication request counter, i.e. with the C API in mind:

1. 使用curl_multi_remove_handle
从多手柄中移除手柄
2. 用curl_easy_reset
重置
3. 设置下一个通话的选项
4. 使用curl_multi_add_handle
将其重新添加到多手柄中

1. remove your handle from the multi handle with curl_multi_remove_handle
2. reset it with curl_easy_reset
3. set the options for the next call
4. re-add it into the multi handle with curl_multi_add_handle