HyperText Transfer Protocol (HTTP)

Question 1

HTTP is stateless, what does that mean?

Answer 1

The server does not know the previous HTTP request

Question 2

In HTTP everything is sent and received in…

Answer 2

Clear text

Question 3

HTTPS

Answer 3

HTTP over a secured TLS connection (HTTPS)

Question 4

HTTP request content

Answer 4

HTTP Method -> GET, PUT, PATCH, POST, DELETE

Target -> URL

Protocol Version -> HTTP/1.1, HTTP/2

Headers -> meta information

Body -> data

Question 5

HTTP Request Header Fields

Answer 5

Accept -> what kind of response resource type to accept

User-Agent -> the product sending the request

Cookie -> Sends a cookie to the server

Authorization -> Authorization method and credentials…

Question 6

HTTP Response content

Answer 6

Protocol Version -> HTTP/1.1, HTTP/2

Status Code -> e.g., 200, 404

Status Text -> e.g., OK, Not Found

Headers -> meta information

Body -> e.g., the requested resource or an error page

Question 7

HTTP Response Header Fields

Answer 7

Age: estimate of seconds since the response was generated

Expires: at what date/time is the response considered “stale” (=outdated)

Allow: list of http methods allowed for this resource

Content-Type: media type of the resource

Set-Cookie: saves a cookie on client side

Question 8

What does URL stand for?

Answer 8

Uniform Resource Locator

Question 9

HTTP Methods (Verbs)

Answer 9

9 different kinds of requests

Common:
GET -> request a representation of the specified resource

POST-> submit an entity to the specified resource

PUT-> replaces the target resource with the request payload

PATCH-> apply partial modifications to a resource

DELETE-> Delete the specified resource

Question 10

HTTP Method Properties

Answer 10

Safe -> Does not cause any side effect on the server(GET)

Idempotent-> the effect on the server is the same, no matter how many times it is executed (DELETE, PUT)

Cacheable-> the response to the request can be stored for future re-use (GET, POST)

Question 11

HTTP response codes

Answer 11

1xx -> Informational
2xx -> Success
3xx -> Redirection
4xx -> Client error
5xx -> Server error

Question 12

Cookies

Answer 12

NOT EVIL >:)
Text saved on the client side (in browser)

The server sets the cookie, the client returns it

Can be modified

Can be deleted