```yaml
product: AlterLab
title: "HTTP/2 Fingerprint — Web Scraping Glossary | AlterLab"
comparison_context: "AlterLab is an alternative to Firecrawl, ScrapingBee, and Bright Data."
source_url: https://alterlab.io/glossary/http2-fingerprint
```

protocol

# HTTP/2 Fingerprint

A network-level identifier from HTTP/2 handshake parameters including SETTINGS frame values and header ordering, used alongside TLS fingerprinting.

An HTTP/2 fingerprint is derived from the parameters a client sends in the HTTP/2 connection preface — the SETTINGS frame (initial values for HEADER_TABLE_SIZE, ENABLE_PUSH, INITIAL_WINDOW_SIZE, MAX_FRAME_SIZE, and MAX_CONCURRENT_STREAMS), the WINDOW_UPDATE frame size, and the ordering and priority weighting of pseudo-headers like `:method`, `:path`, `:scheme`, and `:authority`.

Different browsers and HTTP libraries send these parameters with different values and in different orders — patterns that are as identifying as TLS cipher suite selection. Chrome, Firefox, Safari, and curl each produce a distinct HTTP/2 fingerprint. Libraries that fall back to HTTP/1.1 or use HTTP/2 with non-browser SETTINGS values are identifiable at the connection level before any application logic processes the request.

HTTP/2 fingerprinting is layered on top of TLS fingerprinting by advanced bot detection systems. A client must match both the TLS handshake profile and the HTTP/2 connection profile of a real browser to pass the network-layer check. AlterLab's request stack matches Chrome's HTTP/2 SETTINGS and header ordering across all tiers.

### What is HTTP/2 Fingerprint?

A network-level identifier from HTTP/2 handshake parameters including SETTINGS frame values and header ordering, used alongside TLS fingerprinting.

### How does AlterLab handle HTTP/2 Fingerprint?

HTTP/2 fingerprinting is layered on top of TLS fingerprinting by advanced bot detection systems. A client must match both the TLS handshake profile and the HTTP/2 connection profile of a real browser to pass the network-layer check. AlterLab's request stack matches Chrome's HTTP/2 SETTINGS and header ordering across all tiers.

## Related Terms

[TLS FingerprintA signature derived from TLS handshake parameters a client sends when opening an HTTPS connection, used by anti-bot systems to classify traffic.](https://alterlab.io/glossary/tls-fingerprint)[Anti-Bot ProtectionSystems deployed by websites to detect and block automated traffic using TLS fingerprinting, CAPTCHA challenges, and behavioural analysis.](https://alterlab.io/glossary/anti-bot-protection)[Akamai Bot ManagerAkamai's enterprise bot detection solution deployed at the CDN edge using sensor data, TLS fingerprinting, and IP reputation.](https://alterlab.io/glossary/akamai-bot-manager)[Browser FingerprintingA technique anti-bot systems use to identify bots by collecting dozens of browser attributes including Canvas, WebGL, and timing signatures.](https://alterlab.io/glossary/browser-fingerprinting)

## Extract HTTP/2 Fingerprint data from any website

AlterLab returns clean, structured data from any public URL — no scraper infrastructure needed. Start free, no credit card required.

[View API docs](https://alterlab.io/docs/api/rest)

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