The request headers are set in the Axios wrapper request method and are not present in the Request Headers

service.interceptors.request.use(
    config => {
        config.data = JSON.stringify(config.data);
        config.headers['Authorization'] = getToken();
        config.headers['Content-Type'] = "application/json;charset=utf-8";
        
        return config;
    },
    error => {
        return Promise.reject();
    }
);

The Axios source code under NPM removes the Content-Type setting when RequestData is not set

// Add headers to the request
if ('setRequestHeader' in request) {
    utils.forEach(requestHeaders, function setRequestHeader(val, key) {
    if (typeof requestData === 'undefined' && key.toLowerCase() === 'content-type') {
      // Remove Content-Type if data is undefined
      delete requestHeaders[key];
    } else {
      // Otherwise add header to the request
      request.setRequestHeader(key, val);
    }
  });
}

Solution:
If (typeof requestData === ‘undefined’ & & Key.tolowerCase () === ‘Content-Type ‘)
2. Assign config.data = true to requestData

service.interceptors.request.use(
    config => {
        config.data = JSON.stringify(config.data);
        config.headers['Authorization'] = getToken();

        config.data = true
        config.headers[ 'Content-Type'] = "application/json;charset=utf-8";

        return config;
    },
    error => {
        return Promise.reject();
    }
);

 
Reference data: https://blog.csdn.net/qq_24729895/article/details/80367460