postman Could not get any response

具体错误提示如下：
Could not get any response
There was an error connecting to http://127.0.0.1:10886/smart-...

Why this might have happened:

The server couldn't send a response:
Ensure that the backend is working properly
Self-signed SSL certificates are being blocked:
Fix this by turning off 'SSL certificate verification' in Settings > General
Proxy configured incorrectly
Ensure that proxy is configured correctly in Settings > Proxy
Request timeout:
Change request timeout in Settings > General

错误原因可能如下图所示：