After the request, the server returns the request. However, the front-end browser does not post the request. You need to check whether the headers set in the background is *. Ios13 / android 10 browser can not recognize the background allows the existence of custom headers.

So the background will request the header address
Access-Control-Allow-Headers: *
Copy the code
Modified to
Access-Control-Allow-Headers: accept, content-type, origin, userid, token
Copy the code

You can solve this problem by writing out both the custom and default headers