Sample HAProxy conf with req.body logging

global
    log 127.0.0.1 local0
    user root
    group root
    daemon

defaults
    log     global
    mode    http
    option  httplog
    option  dontlognull
    retries 3
    option redispatch
    timeout connect 5000
    timeout client  120000
    timeout server  90000

frontend www-http
    bind 0.0.0.0:9000

    option http-buffer-request
    declare capture request len 400000
    http-request capture req.body id 0
    log-format {"%[capture.req.hdr(0)]"}

    default_backend node-servers

backend node-servers
    server node google.com:80 maxconn 20

        ## ------ LOG ----------
        #no log  ####this is real line USE THIS to disable log!!! when commented allows log
        mode http
        option http-buffer-request
        declare capture request len 40000000
        http-request capture req.body id 0
        capture request header user-agent len 150
        capture request header Host len 15
        log-format '{"srcIP":"%[src]","backend":"%s","bIP":"%si","bPORT":"%sp","method":"%[capture.req.method]","user-agent":"%[capture.req.hdr(1),json(utf8s)]","uri":"%[capture.req.uri]","body":"%[capture.req.hdr(0)]"}'

        ## --------------------

DONT USE IT IN PRODUCTION! it will kill performance dependent on log method more or less :P Its also not safe and breaks bunch of laws. Remember!

Is it possible to capture all headers?

Anybody got the request body captured ?
I've tried with both haproxy 1.8 and 2.2, and all I get for the captured body is "-"

My frontend looks like

frontend frt_http
    option httplog
    option http-buffer-request
    declare capture request len 400000

    http-request capture req.body id 0
    capture request header user-agent len 150
    capture request header Host len 25
    log-format '{"srcIP":"%[src]","backend":"%s","bIP":"%si","bPORT":"%sp","method":"%[capture.req.method]","user-agent":"%[capture.req.hdr(1),json(utf8s)]","uri":"%[capture.req.uri]","body":"%[capture.req.$

My log output looks like

{"srcIP":"XX.XX.XX.XX","backend":"<NOSRV>","bIP":"-","bPORT":"-","method":"POST","user-agent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/92.0.4515.115 Safari\/537.36","uri":"/index.html","body":"-"}

anyone was able to log body? it return empty body "-"

@lynomet I've success with it, try this:

frontend localhost
...
        http-request capture req.hdr_names len 50
        http-request capture req.hdr len 100
        http-request capture req.body len 8000

        log-format "%r:\n%[capture.req.hdr(0)]\n%[capture.req.hdr(1)]\n%[capture.req.hdr(2)]"
        log /debug-log.socket len 8192 local2 debug

If I understand correctly index of capture.req.hdr refers to each line http-request capture ...

@ValeryDubrava Thanks for the reply
i have tryied your config but i still get empty body "-"
i wounder what haproxy version are you using? i'm using v2.0.29
i think by now i have tried all combinations..nothing works

        ## ------ LOG ----------
        #no log  ####this is real line USE THIS to disable log!!! when commented allows log
        mode http
        option http-buffer-request
        declare capture request len 40000000
        http-request capture req.body id 0
        capture request header user-agent len 150
        capture request header Host len 15
        log-format '{"srcIP":"%[src]","backend":"%s","bIP":"%si","bPORT":"%sp","method":"%[capture.req.method]","user-agent":"%[capture.req.hdr(1),json(utf8s)]","uri":"%[capture.req.uri]","body":"%[capture.req.hdr(0)]"}'

        ## --------------------

DONT USE IT IN PRODUCTION! it will kill performance dependent on log method more or less :P Its also not safe and breaks bunch of laws. Remember!

this works for me on haproxy 2.4, thanks