http-messages

Question 1

What is a client?

Answer 1

anything that connects to the server

Question 2

What is a server?

Answer 2

a piece of computer hardware or software that provides functionality for other programs or devices, called “clients”.

Question 3

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

Answer 3

Browser sends the HTTP request to the server

Question 4

What three things are on the start-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, or the absolute path of the protocol
3. The HTTP version, which defines the structure of the remaining message, acting as an indicator of the expected version to use for the response.

Question 5

What three things are on the start-line of an HTTP response message?

Answer 5

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.

Question 6

What are HTTP headers?

Answer 6

a case-insensitive string followed by a colon (‘:’) and a value whose structure depends upon the type of the header. The whole header, including its value, presents as a single line.

Question 7

Where would you go if you wanted to learn more about a specific HTTP Header?

Answer 7

mdn

Question 8

Is a body required for a valid HTTP request or response message?

Answer 8

NO: Not all responses have one: responses with a status code that sufficiently answers the request without the need for corresponding payload (like 201 Created or 204 No Content) usually don’t.

Question 9

what is a client

Answer 9

anything that connects to the server

Question 10

What is a server?

Answer 10

a piece of computer hardware or software that provides functionality for other programs or devices, called “clients”.

Question 11

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

Answer 11

Browser sends the HTTP request to the server

Question 12

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

Answer 12

usually HTTP/1.1 . A status code, indicating success or failure of the request.

Question 13

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

Answer 13

The status line It consists of three items: The HTTP version number, showing the HTTP specification to which the server has tried to make the message comply. A status code, which is a three-digit number indicating the result of the request

Question 14

What are HTTP headers?

Answer 14

HTTP headers let the client and the server pass additional information with an HTTP request or response

Question 15

Is a body required for a valid HTTP message?

Answer 15

no it is not, at a protocol level, but at the app level you might need it sometimes.