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Dumping HTTP header with ngrep – the network grep

To get the HTTP Header informations for specific clients connections use ngrep and a pattern or a regular expression that will match the packets.

install ngrep (example for debian / ubuntu):

apt-get install ngrep

These examples dumps HTTP header for any connection matching the string “images” on port 80.

user@host:~# ngrep -qi -W normal '/images/'  port 80
interface: lo (
match: /images/

T -> [AP]
GET /images/globe_blogs.gif HTTP/1.1..Host: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; de; rv: Gecko/20101026 Firefox/3
.6.12..Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8..Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3..Accept-Encoding: gzip,deflate..Ac
cept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7..Keep-Alive: 115..Connection: keep-alive..Cookie: …
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