Networking

Question 1

What are the valid top level types of JSON ?

Answer 1

The valid top level types are dictionary and array.

Question 2

What is HTTP?

Answer 2

HTTP is an internet protocol for allowing client/server communication. The client in this case our iOS app makes a request to a Web API / server and gets a response (json) back that we parse (convert) to Swift objects.

Question 3

What is CRUD ?

Answer 3

Create. Read. Update. Delete. This acronym encapsulated the cycle of object creation and modification.

Question 4

Name some HTTP methods ?

Answer 4

GET, POST, DELETE, PUT, UPDATE.

Question 5

What is a status code and give an example ?

Answer 5

Status codes are received via an http response from a server request to indicate the state and validity of the request. 500 status code implies there’s an issue with the server.

Question 6

What are two ways in which web content is formatted for delivery to a client ?

Answer 6

XML and JSON, the latter being the more popular and easier to understand and parse.

Question 7

Explain RESTFul APIs ?

Answer 7

REST is a standard architecture that web developers use present data to a client.

A REST API is a way for two computer systems to communicate over HTTP in a similar way to web browsers and servers. Sharing data between two or more systems has always been a fundamental requirement of software development

Question 8

What is a MIME type ?

Answer 8

MIME (Multipurpose Internet Mail Extensions) type is a label used to describe the media content of a piece of data.

Question 9

What’s the difference between Websockets and HTTP ?

Answer 9

Websockets allow for a constant two-way stream of data and HTTP transfers data via a request -> response model.

e. g Stock market ticker uses websockets for real time data streaming.
e. g Fetching a new Instagram photo using http protocol, client request, server response.