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awk -F ',' 'NR == 1{for(i=1; i<=NF; i++) a[$i] = i; next}
$0 ~ "^" proxy {print $(a[field])}' proxy="main,FRONTEND" field="slim" socat.txt

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Try (untested): $0 ~ "^" proxy FS {...

awk -F ',' 'NR == 1{for(i=1; i<=NF; i++) a[$i] = i; next}
/^main,FRONTEND/ {print $(a["slim"])}
/^apache2,elb4/ {print $(a["ereq"])}' socat.txt