Maybe I should have started with this one as it's web roots.
A few resources to know more about HTTP :
- "HTTP, the protocol every developper should know" : part 1 and part 2
- Know your HTTP, A series of A0-sized posters about the HTTP protocol :
- A beginner's guide to HTTP Cache Headers : article will present Cache Heads and its impacts when you use CDN (Content Delivery Network such as Akamai). If you are not famillar with CDNs, they are introduced in the article.
And as a bonus : HTTP Strict Transport Security (HSTS) which may interest you as soon as you implement HTTPS urls;
Now you should know more about interactions between your browser and websites