Unable access to webex desktop app using tcp mode

Hi
I’m running haproxy 2.4 and when the haproxy is configured in http mode, i can’t access to webex desktop app, says connecting but instead pass to logon page, back to “select webex website”.
Switching to tcp mode, everything work correctly.
Also, this problems continues on haproxy 2.5

Config file in HTTP mode:

#  1,5
# CPU(s) 11
global
	log	127.0.0.1 local0
	maxconn	200000
	nbproc           11
	cpu-map           1 0
	cpu-map           2 1
	cpu-map           3 2
	cpu-map           4 3
	cpu-map           5 4
	cpu-map           6 5
	cpu-map           7 6
	cpu-map           8 7
	cpu-map           9 8
	cpu-map           10 9
	cpu-map           11 10
	uid	0
	gid	0
	chroot	/tmp
	pidfile /var/run/haproxy.pid
	stats socket /var/run/haproxy.stat mode 600 level admin
	stats bind-process 1
	daemon
#	debug
#	quiet

defaults
	log	global
	log-format	HASTATS:::%{+Q}o:::client_ip=%ci:::client_port=%cp:::datetime_of_request=[%tr]:::frontend_name_transport=%ft:::backend_name=%b:::server_name=%s:::time_to_receive_full_request=%TR:::Tw=%Tw:::Tc=%Tc:::response_time=%Tr:::active_time_of_request=%Ta:::status_code=%ST:::bytes_read=%B:::captured_request_cookie=%CC:::captured_response_cookie=%CS:::termination_state_with_cookie_status=%tsc:::actconn=%ac:::feconn=%fc:::beconn=%bc:::srv_conn=%sc:::retries=%rc:::srv_queue=%sq:::backend_queue=%bq:::captured_request_headers_default_style=%hr:::captured_response_headers_default_style=%hs:::server_ip=%si:::server_port=%sp:::frontend_name=%f:::http_method=%HM:::http_request_uri_without_query=%HP:::http_request_query_string=%HQ:::http_request_uri=%HU:::bytes_uploaded=%U:::ssl_ciphers=%sslc:::ssl_version=%sslv:::%[capture.res.hdr(0)]
	mode	http
	option	dontlognull
	retries	3
	option	redispatch
	maxconn	200000
	timeout connect	5000
	timeout client	50000
	timeout server	50000

frontend ddsds
	bind	:3128 name ddsds
	capture request header Host len 1024
	capture request header Content-Type len 1024
	capture request header User-Agent len 1024
	capture request header Referer len 1024
	capture request header X-Forwarded-For len 1024
	capture response header Content-Type len 1024
	capture cookie Cookie_2 len 100
	http-request set-header mode mode:tcp
	http-request capture hdr(mode)  len 10
	mode http
	option	httplog
#	http-keep-alive: * 1 *
	option http-keep-alive
	timeout http-keep-alive 15000
	option prefer-last-server
	option redispatch
	no option httpclose
	option http-tunnel
	timeout client	15000
	timeout http-request	50000
	timeout queue	50000

	default_backend default_ddsds

backend default_ddsds
	mode http
	balance leastconn
#	http-keep-alive: * 1 *
	option http-keep-alive
	timeout http-keep-alive 15000
	option prefer-last-server
	option redispatch
	no option httpclose
	option http-tunnel
	timeout connect	4000
	timeout server	50000
	timeout http-request	50000
	timeout queue	50000
	retries	3

	server normal_port 192.168.58.12:50877 weight 1 maxconn 10000 check inter 60000 rise 2 fall 3 source 192.168.58.13

# ddsds no result
frontend admin_page
	bind	127.0.0.1:64741
	mode http
	stats enable
	stats refresh 10s
	stats uri /stats

Config file in TCP mode:

#  1,5
# CPU(s) 11
global
	log	127.0.0.1 local0
	maxconn	200000
	nbproc           11
	cpu-map           1 0
	cpu-map           2 1
	cpu-map           3 2
	cpu-map           4 3
	cpu-map           5 4
	cpu-map           6 5
	cpu-map           7 6
	cpu-map           8 7
	cpu-map           9 8
	cpu-map           10 9
	cpu-map           11 10
	uid	0
	gid	0
	chroot	/tmp
	pidfile /var/run/haproxy.pid
	stats socket /var/run/haproxy.stat mode 600 level admin
	stats bind-process 1
	daemon
#	debug
#	quiet

defaults
	log	global
	log-format	HASTATS:::%{+Q}o:::client_ip=%ci:::client_port=%cp:::datetime_of_request=[%tr]:::frontend_name_transport=%ft:::backend_name=%b:::server_name=%s:::time_to_receive_full_request=%TR:::Tw=%Tw:::Tc=%Tc:::response_time=%Tr:::active_time_of_request=%Ta:::status_code=%ST:::bytes_read=%B:::captured_request_cookie=%CC:::captured_response_cookie=%CS:::termination_state_with_cookie_status=%tsc:::actconn=%ac:::feconn=%fc:::beconn=%bc:::srv_conn=%sc:::retries=%rc:::srv_queue=%sq:::backend_queue=%bq:::captured_request_headers_default_style=%hr:::captured_response_headers_default_style=%hs:::server_ip=%si:::server_port=%sp:::frontend_name=%f:::http_method=%HM:::http_request_uri_without_query=%HP:::http_request_query_string=%HQ:::http_request_uri=%HU:::bytes_uploaded=%U:::ssl_ciphers=%sslc:::ssl_version=%sslv:::%[capture.res.hdr(0)]
	mode	http
	option	dontlognull
	retries	3
	option	redispatch
	maxconn	200000
	timeout connect	5000
	timeout client	50000
	timeout server	50000

frontend ddsds
	bind	:3128 name ddsds
	capture request header Host len 1024
	capture request header Content-Type len 1024
	capture request header User-Agent len 1024
	capture request header Referer len 1024
	capture request header X-Forwarded-For len 1024
	capture response header Content-Type len 1024
	capture cookie Cookie_2 len 100
	http-request set-header mode mode:tcp
	http-request capture hdr(mode)  len 10
	mode tcp
	option	httplog
	option	dontlognull
	option http-tunnel
	timeout client	15000
	timeout http-request	50000
	timeout queue	50000

	default_backend default_ddsds

backend default_ddsds
	mode tcp
	balance leastconn
	option http-tunnel
	timeout connect	4000
	timeout server	50000
	timeout http-request	50000
	timeout queue	50000
	retries	3

	server normal_port 192.168.58.12:50877 weight 1 maxconn 10000 check inter 60000 rise 2 fall 3 source 192.168.58.13

# ddsds no result
frontend admin_page
	bind	127.0.0.1:64741
	mode http
	stats enable
	stats refresh 10s
	stats uri /stats

Anyone can help me to fix this issue.
Thanks in advance.

Fixed by using option accept-invalid-http-request in frontend.