vue中axios post FormData如何强制设置请求头为application/octet-stream
vue中axios post FormData 默认格式为multipart/form-data，
代码改为
仍旧是默认的，改怎么解决
axios.defaults.headers['Content-Type'] = 'application/json;charset=utf-8'
vue中axios post FormData 默认格式为multipart/form-data，
代码改为
axios.defaults.headers['Content-Type'] = 'application/json;charset=utf-8'