Console error message
Access to XMLHttpRequest at 'http://**/login' from origin 'http://**:9528' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
errError: Network Error
Cause analysis
According to Access-Control-Allow-Origin, it can be seen that it is a cross domain problem. If one address accesses another address, if any of the three places is different in this process, cross domain problems will occur.
1. Access agreement
HTTP, https
2. The port number is different
My error report here is to use 9528 to access 8001
3. Different IP addresses
Solution:
1. Add a comment on the back-end interface controller @CrossOrigin
2. Use the gateway to solve the problem
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