api: YAML JSON TOON Database
version: 1.0.0
format: toon
dataset:
  id: 2824
  slug: http2-http3-features
  title: HTTP/2 and HTTP/3 Features
  description: Key features and improvements introduced in HTTP/2 and HTTP/3 over HTTP/1.1.
  summary: "The features that distinguish HTTP/2 and HTTP/3 from HTTP/1.1, each tagged with the version it belongs to and the problem it addresses: multiplexing, header compression, transport changes in QUIC and connection behavior on mobile networks."
  use_when[2]: You are explaining why HTTP/2 or HTTP/3 helps a particular workload.,You are deciding which protocol version to enable or what to measure after enabling it.
  caveats[2]: "Gains depend on the workload and network; a single large download changes little, many small requests on a lossy network gain the most.","Server push saw little adoption and was removed from major browsers, so treat it as a historical feature."
  related[3]: http-protocol-evolution,network-ports-reference,http-content-negotiation
  entry_count: 13
  fields[4]{section,field,type,example}:
    data,feature,string,Multiplexing
    data,version,string,HTTP/2
    data,description,string,Multiple requests and responses over a single T…
    data,benefit,string,Eliminates head-of-line blocking.
  category: Networking
  category_slug: networking
  tags: "networking,http2,http3,protocols,performance"
  view_count: 45
  created_at: 1793403093
  updated_at: 1793403093
data[13]{feature,version,description,benefit}:
  Multiplexing,HTTP/2,Multiple requests and responses over a single TCP connection.,Eliminates head-of-line blocking.
  Header Compression (HPACK),HTTP/2,Compressed headers using a static and dynamic table.,Reduces overhead on every request.
  Server Push,HTTP/2,Server can push resources before the client requests them.,Reduces round trips for related resources.
  Stream Prioritization,HTTP/2,Requests can be assigned weight and dependency for ordering.,Critical resources can be delivered first.
  QUIC Transport,HTTP/3,Built on UDP instead of TCP for connection establishment.,Eliminates TCP handshake + TLS round trips.
  0-RTT Resumption,HTTP/3,Can resume connections with data from the first packet.,Faster page loads for returning users.
  Connection Migration,HTTP/3,"Connections survive network changes (e.g., WiFi to LTE).",Seamless experience on mobile devices.
  Binary Framing Layer,HTTP/2,Messages are split into binary frames carried on numbered streams instead of text lines.,"Enables multiplexing and cheaper, less ambiguous parsing."
  Flow Control,HTTP/2,Per-stream and per-connection windows limit how much data a sender may transmit.,Prevents one stream from starving others on a shared connection.
  QPACK Header Compression,HTTP/3,Header compression redesigned to work with out-of-order streams.,Keeps compression gains without HPACK's head-of-line blocking.
  No Transport Head-of-Line Blocking,HTTP/3,"Streams are independent in QUIC, so a lost packet delays only its own stream.",Fewer stalls on lossy networks.
  Built-in TLS 1.3,HTTP/3,QUIC integrates the TLS 1.3 handshake into connection setup.,"Fewer round trips before data flows, and encryption is mandatory."
  Alt-Svc Discovery,HTTP/3,A server advertises HTTP/3 availability through the Alt-Svc header or an HTTPS DNS record.,Lets clients upgrade from TCP-based HTTP without a separate port.