2023-09-19

Introduction

Summary

keywords

TODO

HW

Exercise*

Next time

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Recap

Application Layer

HTTP messages, response messages, status codes, stateless, cookies, web caches, conditional GET

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Different Versions of HTTP

HTTP/1.1

introduced multiple, pipelined GETS over single TCP

• first-come-first-served

• has a problem of HOL blocking (HTTP/2 resolves it)

What is HOL blocking?

Big size files blocks the following small files. The transmission looks paused.

How to solve HOL blocking? By dividing files into frames. Small

HTTP/2

solved HOL blocking.

HTTP/3

support for security, conjestion control and more pipelineing over UDP

REST framework

HTTP is a protocol, REST is a architecture.

REST

• Representational State Transfer.

• An idea, architecture, style for distributing hypermedia systems.

• specification of software architecture for the WWW.

• leverages HTTP to transfer data over the internet

memo. other software architecture for WWW RPC, SOAP, GraphQL API, HTTP API, ...

REST API

Have advantages on collaboration with third-party applications.

• Can communicate form another app

• creating new channels for partnership

• building new revenue streams

• creating automated testing suits

https://realpython.com/python-https/

Assn #1

Weather forecast no more than 100 lines.

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we don't study smtp. skip it

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DNS