Notes/UNB/Year 4/Semester 2/CS3873/2024-01-29.md

Lecture Topic: HTTP

Conditional Get

Last-Modified

You can check the Last-Modified header to only get contents if the contents are newer than the contents of the cache

ETag

Use the hash of an object to check for modification to solve cache invalidation problem

TCP and HTTP

HTTP runs on top of TCP

• Client initiates TCP request to server
• Server accepts TCP connection
• Clint confirms request
• Three way handshake

Non-persistent HTTP

RTT = Round trip time