Deck 11: Updating Web Pages With Ajax

Question 1

An HTTP response code of 200 indicates that the request was successful.

Answer 1

True

Question 2

____ refers to the temporary storage of data for faster access.

A) Caching
B) Salting
C) Shadowing
D) Hashing

Answer 2

A

Question 3

The first line of an HTTP message specifies the date.

Answer 3

False

Question 4

The ____ header specifies how a web browser should cache any server content it receives.

A) Caching
B) Cache-Control
C) CacheLevel
D) Cached

Question 5

You can use a server-side script as a proxy to access data from  another domain.

Question 6

Every web page is identified by a unique address called the ____.

A) host string
B) host
C) URL
D) HTTP

Question 7

The term ____ refers to the application, usually a web browser, that makes the request.

A) HTTP server
B) host
C) HTTP URL
D) HTTP client

Question 8

A(n)____ is a data source made available on one domain for use on other domains across the web.

A) AJAX request
B) web service
C) HTTP service
D) DHTML service

Question 9

After you instantiate an XMLHttpRequest object, you use the ____ method with the instantiated XMLHttpRequest object to specify the request method (such as GET or POST )and URL.

A) alive()
B) create()
C) instantiate()
D) open()

Question 10

The term ____ refers to a computer system that is being accessed by a remote computer.

A) protocol
B) host
C) client
D) URL

Question 11

HTTP client requests and server responses are both known as HTTP ____.

A) messages
B) scripts
C) strings
D) queries

Question 12

Ajax gets its name from the fact that when it was first used, it was practical only with JavaScript and ____.

A) ActiveX
B) DOM
C) XML
D) HTTPS

Question 13

By combining the ____ object with DHTML techniques, you can update and modify individual portions of your web page with data received from a web server.

A) AjaxRequest
B) XMLHttpRequest
C) HttpRequest
D) XMLRequest

Question 14

You can use a server-side script as a ____ to access data from another domain.

A) proxy
B) switch
C) router
D) firewall

Question 15

The  XMLHttpRequest   object can be used to request and receive data without reloading a web page.

Question 16

The term ____ is another name for a web server and refers to a computer that receives HTTP requests and returns responses to HTTP clients.

A) URL
B) HTTP client
C) HTTP server
D) host

Question 17

The purpose of the ____ policy is to prevent malicious scripts from modifying the content of other windows, tabs, and frames and prevent the theft of private browser information and information displayed on secure web pages.

A) privacy
B) proxy
C) delegation
D) same-origin

Question 18

The XMLHttpRequest object uses ____ to exchange data between a client computer and a web server.

A) HTTP
B) FTP
C) HTTPS
D) SSL

Question 19

____ define information about the request or response message and about the contents of the message body.

A) Queries
B) Tags
C) Headers
D) Labels

Question 20

CORS is supported by all browsers in use today.

Question 22

Why do you need access to a web server when developing an Ajax application?

Question 23

A(n)____________________ request allows JavaScript to continue processing while it waits for a server response.

Question 24

A web server's reply to a request is known as the ____________________.

Question 25

Why is the Cache-Control header important for Ajax applications?

Question 26

Are synchronous or asynchronous responses more resistant to server problems? Why?

Question 27

What are the four steps in using Ajax to update data?

Question 28

How does CORS work?

Question 29

____ requests JSON content using a script element rather than an XMLHttpRequest object.

A)JSON-P
B)CORS
C)proxy
D) XDomainRequest

Question 30

All the information needed to create a JSON-P request is packaged into the URL specified  for the  ____________________   attribute of the script element.

Question 31

To improve performance, you should call the ____ method of the XMLHttpRequest object to cancel any existing HTTP requests before beginning a new one.

A) exit()
B) abort()
C) cancel()
D) delete()

Question 32

Why should you not include an API key in public JavaScript code?

Question 33

How can you create an asynchronous request with JavaScript?

Question 34

The value of the responseText property is almost always a(n)____ string.

A)XML
B)XHTML
C)JSON
D)HTML

Question 35

Why is it important to use JSON-P only with a web service that you trust?

Question 36

How can a proxy be useful with Ajax?

Question 37

____________________ is a set of rules that defines how requests are made by an HTTP client to an HTTP server, and how responses are returned from an HTTP server to an HTTP client.

Question 38

After you have defined the basic request criteria, you use the ____ method with the instantiated XMLHttpRequest object to submit the request to the server.

A) pass()
B) request()
C) send()
D) call()

Question 39

Unlike standard HTTP requests, which usually replace the entire page in a web browser, the ____________________ object can be used to request and receive data without reloading a web page.

Question 40

A(n)____ request stops the processing of the JavaScript code until a response is returned from the server.

A) asynchronous
B) global
C) domain
D) synchronous

Question 41

Why is it generally a good practice to reuse an instantiated XMLHttpRequest object?