Postman collection for Avalanche,

My question: I install all environment and collection of avax to postman
[Postman collection for Avalanche
however I have problem in environment elements
protocol
host
port

one avax developer said me I need to change as
protocol:https
host:api.avax.network
port:443

I take the following error

POST https://api.avax.network :443/ext/bc/C/rpc

Error: Invalid character in header content [“Host”]

what is the problem?

sincerely

Details (like screenshots):

How I found the problem:

I’ve already tried: