SAML authentication integration b/w UI and Backend

[minaksheej]

I am new to SAML authentication I am trying to build saml authentcation, where my front-end is using react and bank-end as spring boot application . I am able to authenticate api's of backend but when I am integrating with UI I am getting error.......I want to understand what does this line "start": "ng serve -o --proxy-config proxy.config.json --port 3000"," does in package.json I have tried proxying in my application but its not working. Please help me to understand this