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Why HTTP?

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Building Cloud Services with the Java Spring Framework

Université Vanderbilt

4.6 (13 notes) | 4.1K étudiants inscrits

This MOOC describes by example how to build cloud services via the use of object-oriented design techniques; Java programming language features; Java Servlets, the Java Spring Framework; and cloud computing platforms, such as Amazon Web Services. Due to the importance of building secure and scalable mobile/cloud platforms, this MOOC will not only show you how to build cloud services, but how to do so securely, scalably, and efficiently. Security and scalability topics will be woven into discussions of cloud service creation so that students learn, from the start, how to create robust cloud services.

Visualiser le programme de cours

Compétences que vous apprendrez

Hypertext Transfer Protocol (HTTP), Servlets, Cloud Services, Web Application, Java Spring Framework

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4.6 (13 notes)

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À partir de la leçon

Week One

The description goes here

Introduction 3:06

What are Communication Protocols? 4:14

Intro to HTTP 5:16

What is a Cloud Service? 7:45

HTTP Request Methods 4:45

HTTP Request Anatomy 4:40

URLs & Query Parameters 8:45

Mime Types & Content Type Headers 7:54

Request Body Encoding 5:55

HTTP Response Anatomy 5:36

HTTP Response Codes 7:22

Protocol Layering & HTTP Design Methodologies 6:39

HTTP Polling 13:19

Push Messaging 9:54

Enseigné par

Dr. Jules White
Associate Professor of Computer Science
Dr. Douglas C. Schmidt
Professor of Computer Science and Associate Chair of the Computer Science and Engineering Program

Transcription

[MUSIC]

So why are we using a web browser

protocol to integrate mobile clients with cloud services?

Why do we want to use HTTP to talk to the cloud?

Well HTTP provides us a number of nice properties.

One is, we've got a uniform interface that we can provide via

HTTP to the services or resources that are sitting on the server.

And, for example, if a client is a Browser

and sends a request over HTTP and that Server

rec, receives that request, the request is exactly the

same as if a mobile device had sent it.

So, if this is a Mobile device that's sending that request, either way

on the other side, on the server side, that request still has to conform

to the same requirements and specifications of the HTTP protocol.

So we can have a common interface.

This is one of the big advantages of

using HTTP to interact with cloud resources and services.

Is we don't have to go and rewrite

everything from scratch and figure out a whole

new way of having our servers accessible and

having mobile devices able to communicate with them.

We can reuse what we're already building and providing

to our browser based clients and the web is ubiquitous.

Everybody's building websites, everybody's supporting web service as it is.

Why not reuse this infrastructure for mobile?

And so that's one of the big reasons behind using

HTTP to support mobile and cloud interactions.

Now, we get a number or of other great things as well.

There's already all kinds of stuff on the server side from a

framework and programmatic perspective that we can use to process HTTP requests.

So there's things for doing stuff like sessions

or remembering when people request something, who that

person is and what they previously requested or

what other data is associated with their current login.

We also get things like Data marshalling.

This is very important when you want to convert from the format of

the HTTP request to some other format that you need to process.

And there's a huge amount of infrastructure that's already

been developed, in terms of libraries and frameworks, that

you can use to program if you use HTTP

as your underlying protocol for your interaction with the cloud.

But there's also a number of other reasons that it's really nice to use HTTP.

There's also infrastructure that decides, how do we

load balance and distribute requests across our servers?

So for example, if you have a million people accessing your, your

service simultaneously, how are you going

to distribute those requests across those servers?

So, Load Balancing infrastructure for HTTP can be reused

if we're using HTTP as the communication mechanism with the cloud.

So there's such a significant investment both in the existing frameworks and

libraries, the load balancing and other

management infrastructure that's been developed for HTTP.

It's natural to use HTTP as an interaction mechanism with the cloud.

Now, as we'll see later in the class, there's some challenges to

using HTTP, particularly when things that we would like to do with

our mobile services don't fit into the client server model where the

client is always the mobile device requesting some resource from the server.

So maybe an email comes into the server

and your client needs to be notified about it.

Well that's difficult to fit into the HTTP model.

But we'll talk about how we overcome some of those challenges later in the lessons.

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