Payload display incorrect format

Hi, My Irule: when RULE_INIT { Log debug to /var/log/ltm? 1=yes, 0=no set static::payload_dbg 1 set static::log_local 0 Limit payload collection to 5Mb set static::max_collect_len 5368709120 HSL pool name set static::hsl_pool "ABC" Max characters to log locally (must be less than 1024 bytes) https://clouddocs.f5.com/api/irules/log.html set static::max_chars 900 } when CLIENT_ACCEPTED { set hsl [HSL::open -proto UDP -pool $static::hsl_pool] set clientip [IP::remote_addr] } when CLIENTSSL_HANDSHAKE { Identify the Client and negotiated cipher. } when SERVERSSL_HANDSHAKE { Identify the connected server and negotiated cipher. } when HTTP_REQUEST { set uri [HTTP::uri] set clientip [IP::client_addr] set host [HTTP::host] set method [HTTP::method]

 

     log each Header.
    if {[HTTP::method] eq "PUT"} {
        set req_payload [HTTP::payload]
        set a $req_payload
    }
    if {[HTTP::method] eq "POST"} {
        if {[HTTP::header exists "Content-Length"] && [HTTP::header "Content-Length"] <= 1048000} {
            set content_length [HTTP::header "Content-Length"]
        } else {
            set content_length 1048000
        }
        if { $content_length > 0 } {
            HTTP::collect $content_length
        }
    }
     Prevent the server from sending a compressed response
     remove the compression offerings from the client
    HTTP::header remove "Accept-Encoding"
     Don't allow response data to be chunked   
    if { [HTTP::version] eq "1.1" } {
        HTTP::version "1.0"
    }
}
when HTTP_REQUEST_DATA {

    if {[HTTP::method] eq "POST"} {
        set req_payload [HTTP::payload]
    }
    HSL::send $hsl "$clientip $host $uri $method $req_payload"
}

Thanks