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Clarify header count in JA4H #173

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Sep 30, 2024
Merged

Clarify header count in JA4H #173

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f5ef25b
Add technical details file for JA4H
s-spindler Sep 24, 2024
8efe153
Allow max 99 as header count value
s-spindler Sep 24, 2024
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6 changes: 3 additions & 3 deletions python/ja4h.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,14 +24,14 @@ def to_ja4h(x, debug_stream=-1):
unsorted_cookie_values = []

x['headers'] = [ h.split(':')[0] for h in x['headers'] ]
x['headers'] = [ h for h in x['headers']
if not h.startswith(':') and not h.lower().startswith('cookie')
x['headers'] = [ h for h in x['headers']
if not h.startswith(':') and not h.lower().startswith('cookie')
and h.lower() != 'referer' and h ]

raw_headers = x['headers'][:]

#x['headers'] = [ '-'.join([ y.capitalize() for y in h.split('-')]) for h in x['headers'] ]
header_len = '{:02d}'.format(len(x['headers']))
header_len = '{:02d}'.format(min(len(x['headers']), 99))

if 'cookies' in x:
if isinstance(x['cookies'], list):
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9 changes: 9 additions & 0 deletions technical_details/JA4H.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
# JA4H: HTTP Client Fingerprint

![JA4H](https://github.com/FoxIO-LLC/ja4/blob/main/technical_details/JA4H.png)

JA4H fingerprints the HTTP client based on each HTTP request.

### Number of Headers:
2 digit number of headers, not counting Cookie and Referer. For 3 headers the value is "03".
If there are more than 99, the output is 99.