HPACK isn’t actually an acronym – it’s just the name given to HTTP/2’s header compression format. Think of HPACK like a smart dictionary system for website data:
- Common Phrases Dictionary
- Instead of sending full phrases like “show me the webpage” each time, it uses shortcodes
- Like texting omw instead of on my way
- Learning New Phrases
- As you browse, HPACK remembers new information you exchange with websites
- Future visits use these shortcuts automatically
- Like how your phone remembers email addresses you’ve typed before
- Extra Compression
- Takes the remaining text and makes it even smaller
- Similar to zipping a file before sending it
Real Business Impact:
- Faster website loading for customers
- Lower bandwidth costs
- Better mobile experience
- Reduced server costs
Without HPACK, websites send the same information repeatedly. With HPACK, they send it once and then just use quick references—like having a conversation where you say, Like I mentioned before, instead of repeating the whole story.