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HTTP/1.1, HTTP/2 & HTTP/3

Multiplexing, prioritisation and the transport each is built on.

4Questions
11Flashcards
5Terms
Drill this topic All of Networking
Questions

4 to work through

  1. intermediate

    A platform is considering moving customer traffic to HTTP/3. What does it actually improve, for whom, and what does it complicate?

    2 min answer
  2. intermediate Multiple choice

    A team upgrades to HTTP/3 and median page load time is unchanged. Was the upgrade worthless?

    2 min answer
  3. advanced

    A video platform moves from HTTP/2 over TCP to HTTP/3 over QUIC. Which specific problems does this solve for video delivery, and what new operational costs appear?

    2 min answer
  4. advanced

    You migrate a mobile API to HTTP/2 and p99 latency gets worse for users on cellular networks, while p50 improves. Explain and decide what to do.

    1 min answer
Terminology

5 terms in this topic

concept

Head-of-Line Blocking

One delayed item stalling everything queued behind it, even when the rest could have been processed - the failure mode that ordering guarantees create.

 protocol

HTTP Protocol Versions

What each HTTP version changed, which problem it solved, and where the benefit actually shows up.

 protocol

HTTP/2 Multiplexing

Carrying many concurrent request/response streams over a single TCP connection, removing the need for multiple connections per origin.

 concept

Idle Connection Race

The unavoidable window where a server closes a pooled connection just as a client sends a request on it, producing a small error floor that is worst …

 protocol

QUIC

A transport built on UDP that provides streams, encryption and congestion control, removing TCP's head-of-line blocking and reducing connection setup…
Networking

Neighbouring topics

Networking

General material on the network path underneath an architecture.

4 quiz 13 cards 14 terms

TCP/IP

Handshakes, congestion control, head-of-line blocking and connection reuse.

3 quiz 9 cards 2 terms

DNS

Resolution, TTL behaviour, traffic steering and failover latency.

5 quiz 7 cards 3 terms

TLS & Certificates

Encryption, integrity, authentication, termination points and expiry.

6 quiz 7 cards 5 terms

Layer 4 vs Layer 7

Connection-level versus request-level balancing, and what each unlocks.

4 quiz 10 cards 3 terms

Reverse Proxies

One place for TLS, routing, caching, compression and rate limiting.

3 quiz 9 cards 5 terms

Content Delivery Networks

Edge caching, origin offload, spike absorption and dynamic content.

8 quiz 11 cards 6 terms

Firewalls & Security Groups

Default-deny, stateful rules, and restricting egress as well as ingress.

5 quiz 8 cards 3 terms

NAT & Egress

Outbound-only connectivity, its per-gigabyte cost and its zone binding.

4 quiz 11 cards 4 terms

VPC Design

Address planning, peering and the ranges you can never resize.

3 quiz 9 cards 3 terms

Subnetting

Tiering, zone binding, and sizing for an address-hungry platform.

3 quiz 9 cards 3 terms

Routing & BGP

How traffic finds you, anycast, and route withdrawal as a failure mode.

2 quiz 8 cards 5 terms

Service Mesh Networking

Sidecar proxies supplying mTLS, retries and traffic policy.

4 quiz 11 cards 3 terms

WebSockets & Realtime

Persistent bidirectional connections and the capacity model they impose.

6 quiz 13 cards 6 terms

gRPC Transport

HTTP/2 multiplexing, binary encoding and streaming semantics.

4 quiz 12 cards 3 terms

API Gateways

The single entry point, and the business logic that must stay out of it.

3 quiz 10 cards 4 terms

Network Performance

Latency floors, bandwidth-delay product, and what no code change fixes.

5 quiz 13 cards 5 terms

Private Connectivity

Private endpoints, peering and dedicated links to managed services.

4 quiz 7 cards 3 terms

Network Troubleshooting

Flow logs, packet paths, and localising a problem to a hop.

6 quiz 8 cards 3 terms