http-messages-recap

Question 1

What is a client?

Answer 1

a client is a service requester.

Question 2

What is a server?

Answer 2

a server is the provider of a resource of service.

Question 3

Which HTTP method does a browser issue to a web server when you visit a URL?

Answer 3

an HTTP GET request

Question 4

What is on the first line of an HTTP request message?

Answer 4

1. An HTTP method, a verb (like GET, PUT or POST) or a noun (like HEAD or OPTIONS), that describes the action to be performed.
2. The request target, usually a URL
3. The HTTP version
   Ex: GET / HTTP / 1.1

Question 5

What is on the first line of an HTTP response message?

Answer 5

The start line of an HTTP response, called the status line, contains the following information:

1. The protocol version, usually HTTP/1.1.
2. A status code, indicating success or failure of the request. Common status codes are 200, 404, or 302
3. A status text. A brief, purely informational, textual description of the status code to help a human understand the HTTP message.

A typical status line looks like: HTTP/1.1 200 OK

Question 6

What are HTTP headers?

Answer 6

HTTP headers are used to pass additional information between client and server through an HTTP request or response. (meta information)

Question 7

Is a body required for a valid HTTP message?

Answer 7

no.