Section 1
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Common HTTP Methods
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Section 1
(50 cards)
Common HTTP Methods
GET, PUT, DELETE, POST, OPTIONS
What is messaging in RESTful webservices
A client sends a message in form of a HTTP Request and server responds in form of a HTTP Response. This technique is termed as Messaging. These messages contain message data and metadata i.e. information about message itself.
Use Plural Noun
Use plural noun to define resources. For example, we've used users to identify users as a resource.
What are the core components of a HTTP Request
Request has five major parts: Verb, URI, HTTP Version, Request Header, Request Body
What is the purpose of HTTP Verb in REST based webservices
VERB identifies the operation to be performed on the resource.
DELETE
Used to remove a resource
What are the best practices to create a standard URI for a web service
Important points Use Plural Noun, Avoid using spaces, Use lowercase letters, maintain backward compatibility, use HTTP verb
What is the purpose of a URI in REST based webservices
Purpose of an URI is to locate a resource(s) on the server hosting the web service.
POST
Used to update an existing resource or create a new resource
Use lowercase letters
Although URI is case-insensitive, it is good practice to keep url in lower case letters only.
HTTP Response Example of 404
Status/Response Code
core component of a HTTP Response Indicate Server status for the requested resource. For example 404 means resource not found and 200 means response is ok.
What is URI
URI stands for Uniform Resource Identifier. Each resource in REST architecture is identified by its URI.
Completeness
A design best practice Format should be able to represent a resource completely. For example, a resource can contain another resource. Format should be able to represent simple as well as complex structures of resources.
HTTP Request Example of POST
PUT
Used to create a new resource
HTTP Request Specific Header Fields
accept* authorization* cookie expect from host referer user-agent
Response Body
core component of a HTTP Response Response message content or Resource representation.
HTTP Request Example of Get
Request Header
core component of a HTTP Request Contains metadata for the HTTP Request message as key-value pairs. For example, client ( or browser) type, format supported by client, format of message body, cache settings etc.
What are webservices
A web service is a collection of open protocols and standards used for exchanging data between applications or systems. Software applications written in various programming languages and running on various platforms can use web services to exchange data over computer networks like the Internet in a manner similar to inter-process communication on a single computer
Response Header
core component of a HTTP Response Contains metadata for the HTTP Response message as key-value pairs. For example, content length, content type, response date, server type etc.
OPTIONS
Used to get the supported operations on a resource
Understandability
A design best practice Both Server and Client should be able to understand and utilize the representation format of the resource.
What do you mean by idempotent operation
these operations means their result will always be the same no matter how many times these operations are invoked
What is the format of a URI in REST architecture
A URI is of following format − <protocol>://<serviceName>/<ResourceType>/<ResourceID>
HTTP Header Fields
cache-control connection date pragma trailer transfer-encoding upgrade via warning
HTTP Version
core component of a HTTP Request Indicate HTTP version, for example HTTP v1.1
Disadvantage of statelessness
Web services need to get extra information in each request and then interpret to get the client's state in case client interactions are to be taken care of.
What is a resource in REST
REST uses various representations to represent a resource where text, JSON, XML. XML and JSON are the most popular representations of resources.
What are best practices to design a resource representation
Understandability, Completeness, Linkability
HTTP Response Specific Header Fields
age location retry-after server set-cookie content-language content-length* content-location content-type* expires last-modified
REST stands for
REpresentational State Transfer
GET
Provides a read only access to a resource
Maintain backward compatibility
As Web Service is a public service, a URI once made public should always be available. In case, URI gets updated, redirect the older URI to new URI using HTTP Status code, 300.
Advantages of statelessness
Web services can treat each method request independently. Web services need not to maintain client's previous interactions. It simplifies application design. As HTTP is itself a statelessness protocol, RESTful Web services work seamlessly with HTTP protocol.
What are RESTful webservices
Web services based on REST Architecture are known as RESTful web services. These web services use HTTP methods to implement the concept of REST architecture. A RESTful web service usually defines a URI, Uniform Resource Identifier a service, provides resource representation such as JSON and set of HTTP Methods.
HTTP Response Example of 200
What is REST
web standards based architecture and uses HTTP Protocol for data communication. It resolves around resource where ever component is a resource and a resource is accessed by a common interface using HTTP standard methods. In REST architecture, a REST Server simply provides access to resources and REST client accesses and presents the resources. Here each resource is identified by URIs/ global IDs. REST uses various representations to represent a resource like text, JSON and XML. Now a days JSON is the most popular format being used in web services.
Request Body
core component of a HTTP Request Message content or Resource representation.
Avoid using spaces
Use underscore(_) or hyphen(-) when using a long resource name, for example, use authorized_users instead of authorized%20users.
use http verb
Always use HTTP Verb like GET, PUT, and DELETE to do the operations on the resource. It is not good to use operations names in URI.
URI
core component of a HTTP Request Uniform Resource Identifier (URI) to identify the resource on server.
What is statelessness in RESTful webservices
The client's application state should never be stored on the server, but passed around from the client to every place that needs it. That is where the ST in REST comes from, State Transfer. You transfer the state around instead of having the server store it. This is the only way to scale to millions of concurrent users. If for no other reason than because millions of sessions is millions of sessions.
Verb
core component of a HTTP Request Indicate HTTP methods such as GET, POST, DELETE, PUT etc.
Likability
A design best practice A resource can have a linkage to another resource, a format should be able to handles such situations.
HTTP Version
core component of a HTTP Response Indicate HTTP version, for example HTTP v1.1 .
Core components of a HTTP response
Four major parts: Status/Response Code, HTTP Version, Response Header, Response Body
What is addressing in RESTful webservices
Addressing refers to locating a resource or multiple resources lying on the server. It is analogous to locate a postal address of a person.
Which protocol is used by RESTful webservices?
RESTful web services make use of HTTP protocol as a medium of communication between client and server.
Section 2
(39 cards)