http Logs Viewer can be used to open Amazon AWS Load Balancer (NLB/ELB) Logs
Use the following Custom log format for NLB/ELB logs
LogFormat "type %t elb %h target request_processing_time target_processing_time response_processing_time elb_status_Code %>s received_bytes sent_bytes \"%r\" \"%{User-Agent}i\" ssl_cipher ssl_protocol target_group_arn trace_id %v chosen_cert_arn"
or
LogFormat "%t elb %h target request_processing_time target_processing_time response_processing_time elb_status_Code %>s received_bytes sent_bytes \"%r\" \"%{User-Agent}i\" ssl_cipher ssl_protocol %tls"
More information on Amazon Application Load Balancer Logs is found here
