Request header field XXXX is not allowed by access control allow headers in preflight response

Error message

This is because the target service does not allow adding... To the request header x-run-as This

terms of settlement

The first one is , The front-end request will send the request header x-run-as Take this out

The second kind , In the backend cross domain configuration Access-Control-Allow-Headers Add this to the request header key

// add x-run-as, Out of commission * Otherwise, it will be treated as an ordinary string 
 response.setHeader("Access-Control-Allow-Headers", "Content-Type,Access-Token,x-run-as"); 

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