Live dump of HTTP request/response headers

Run on the machine in question:

live HTTP response headers
tcpdump -v -n -S -s 0 -A 'tcp src port 80'

live HTTP request headers
tcpdump -v -n -S -s 0 -A 'tcp dst port 80'

In case of nginx being the proxy use ‘lo’ interface:
tcpdump -v -n -S -s 0 -A 'tcp src port 80' -i lo

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