API在邮递员中工作正常，但在angular2中却不能

Question

I have an API to send an OTP to mobile. It is working fine via PostMan but not via angular2.

I am getting this error "Request header field Access-Control-Allow-Origin is not allowed by Access-Control-Allow-Headers in preflight response."

Any help

Thanks in advance

Answer 1

这是一个后端问题，后端开发人员必须编写代码以允许标头和所有API的来源。

Answer 2

在POST调用中包含Allow-Cross-Origin标头。