Address on listen and server method

[ehernandez-xk]

Hi Mat

Following your book, I have a question related to the function http.ListenAndSeve()

If you see in my chat project I build and run the app inside a Docker container
but using my address "localhost:8080" in the function does't work inside the container. (it is not visible out of the container)

http.ListenAndServe("localhost:8080", nil)

This way works (ehernandez-xk/bp_app@4d5f9c8)

http.ListenAndServe(":8080", nil)

What does the functions do when ":8080"?

By the way, Your book is awesome!

[matryer]

Thank you, I'm glad you're enjoying it. I'd love a review if you have time.

If you specify localhost:8080 as the endpoint, it will check to ensure the host is localhost. For Docker and other environments (like when it's hosted on another domain) it won't necessarily be bound to the right place.

So :8080 is like saying: Bind to port :8080 regardless of the incoming host name.

You can also do IP addresses too: 123.234.345.456:8080 and it will only work when hosted at that address.

This is more of a TCP thing than Go.

[ehernandez-xk]

Thank you @matryer for the feedback,

I already did the review it was a pleasure.