HTTP/2 Fingerprinting: The Next Frontier in Bot Detection for Ad Traffic

IP rotation and browser spoofing are old news. HTTP/2 fingerprinting reveals what bots can't hide.

What is HTTP/2 Fingerprinting?

HTTP/2 connections have unique characteristics:

SETTINGS frame values
WINDOW_UPDATE patterns
PRIORITY frame behavior
Header order

Why Bots Fail at HTTP/2

class HTTP2Fingerprint:
    KNOWN_SIGNATURES = {
        'chrome': {'settings': [65536, 1000, 6291456], 'priority': True},
        'python': {'settings': [4096, 100, 65535], 'priority': False},
        'golang': {'settings': [4096, 250, 1048576], 'priority': False}
    }

    def analyze(self, conn):
        fp = self.extract(conn)
        for name, sig in self.KNOWN_SIGNATURES.items():
            if self.match(fp, sig) > 0.9:
                return {'client': name, 'confidence': 0.95}
        return {'client': 'unknown'}