Concurrent API Design - 6.4 Sending HTTP requests

Question 1

What are the steps involved in sending a request an reading a response using the http package?

Answer 1

1. The Do method sends a request using a Request value.
2. It receives a response as a Response value. The Response type represents a response from an HTTP request and contains details such as status code and body in a field called Body.
3. You can use the Body field to stream the server’s response.

Question 2

What is io.Reader?

Answer 2

The Reader type is an interface that can be used to Read a stream of bytes from any resource.

Question 3

What is io.Writer?

Answer 3

The Writer type is an interface that can be used to Write a stream of bytes to any resource (such as file or memory).

Question 4

What is io.Discard?

Answer 4

Discard is a variable that implements Writer such that all Write calls succeed without doing anything.

Question 5

What is io.Copy(dst, src)?

Answer 5

Copies from src to dst until either EOF is reached on src or an error occurs.

Question 6

How many connections does http.DefaultClient keep open and how many are allowed for reuse to the same host?

Answer 6

100 connections can be opened.
2 can be reused to send to the same host.

Question 7

What is http.Transport?

Answer 7

This is the Transport type. The transport establishes TCP connections, sends HTTP requests, and has a connection pool to store idle connections.

Question 8

What is the http.Client?

Answer 8

The Client type provides a nice API and allows you to send HTTP requests, handles cookies, and redirects.