Topic 3

Question 1

What are some actions we can perform with the file_system module?

Answer 1

• Create directories and files
• View directories and files
• Stream files
• Read and write files
• etc.

Question 2

What does it mean when a method is synchronous?

Answer 2

The method stops all other operations until this one is finished.

Question 3

What does it mean when a method is asynchronous?

Answer 3

Other operations/processes can execute while this one completes itself. When complete, a callback function will be called.

Question 4

How to read and write files?

Answer 4

fs.readFile(path, callback(err, data)) and fs.writeFile(etc)

Question 5

How to read a directory?

Answer 5

fs.readdir(path, callback(err, files))

Question 6

What is the general purpose of the URL module?

Answer 6

To parse URls

Question 7

What is the general form of an URL?

Answer 7

Protocol://Domain-name:port/Directory-path/Filename

Question 8

With the URL module we can access information like the…

Answer 8

host, protocol, authentication details, query strings, etc

Question 9

The URL has two main constructors. They are

Answer 9

The URL class, which allows us to access the data of a URL and…
The URLSearchParams.set/get which allows us to manipulate the query string

Question 10

What is HTTP?

Answer 10

A generic, stateless, protocol which can be used for many tasks beyond its use for hypertext, such as name servers and distributed object management systems, through extension of its requests methods ,error codes, and headers.

Question 11

What are the different versions of HTML and when were they introduced and with what features?

Answer 11

1991 v0.9 - process static pages
1992 v0.1 - CSS, video/script/img processing
1994 v1.1 - keep-alive + cookies
2012 v2.0 - collaboration + social media

Question 12

________ ___ _____ are created using server side scripts.

Answer 12

Dynamic web pages. The scripts processes data that comes from user input and databases.

Question 13

The protocol of a URL defines…

Answer 13

the type of protocol used by client and server ex. http, https, ftp

Question 14

The domain name of a URL defines…

Answer 14

the web server

Question 15

The port of a URL defines…

Answer 15

the port used (default 80)

Question 16

The directory path of a URL defines…

Answer 16

the path to the file

Question 17

The filename of a URL defines…

Answer 17

the requested file

Question 18

If there is no specified file name, the server will… (3 things)

Answer 18

• Return an error message
• Provide the default file (usually index.html)
• Redirect to a default location

Question 19

The HTTP request GET is used to…

Answer 19

request a web resource from the server (most common HTTP request)

Question 20

The HTTP request HEAD is used to…

Answer 20

get the header that a GET request would obtain. (Used to check against local cache copy, as it contains the date)

Question 21

The HTTP request POST is used to…

Answer 21

post data up to the web server

Question 22

The HTTP request PUT is used to…

Answer 22

ask the server to store the data

Question 23

The HTTP request DELETE is used to…

Answer 23

ask the server to delete the data

Question 24

Which class of HTTP response status codes refer to informational?

Answer 24

1xx (server is continuing the process)

Question 25

Which class of HTTP response status codes refer to success?

Answer 25

2xx (200 is the all good code)

Question 26

Which class of HTTP response status codes refer to redirection?

Answer 26

3xx (further action needed to complete request)

Question 27

Which class of HTTP response status codes refer to client error?

Answer 27

4xx

Question 28

Which class of HTTP response status codes refer to server error?

Answer 28

5xx

Question 29

A browser distinguishes between different file types using the ____ type.

Answer 29

MIME (Multipurpose Internet Mail Extensions). Usually in the form of “type/subtype” ex “text/html”

Question 30

What is the easiest way to make an process HTTP requests?

Answer 30

Using the HTTP module.

Use http.request(options, callback(res)) to make a request

Question 31

How do you create a file server?

Answer 31

http.createServer(callback(req, res))

Res is the response provided by the server, usually done by using writeHead and end functions.

Question 32

In addition to turning the server on, what other crucial information must you specify?

Answer 32

The server must be given a port to listen to.

server.listen(port)