how to configure haproxy to publish website with substring to real backend server

Question

the real published website of the backend server is 192.168.1.6:8888/abc and 192.168.1.7:8888/abc , The ip of haproxy is 192.168.1.5 , how can I set in haproxy that user visit 192.168.1.5:8888/abc, the http request will be forwarded to the real backend server(192.168.1.6:8888/abc and 192.168.1.7:8888/abc) ? the default backend server is 192.168.1.8:8088 and 192.168.1.9. (a default nginx website)

+++++++++++++ My configuration is +++++++++++++++

frontend case3
bind 192.168.1.5:8888

acl abc path_beg -i /abc use_backend abc_servers if abc default_backend nginx1 

backend abc_servers

mode tcp balance roundrobin server abc1 192.168.1.6:8888 cookie server abc2 192.168.1.7:8888 cookie 

backend nginx1

balance roundrobin server master1 192.168.1.8:8888 maxconn 1024 weight 5 check server master2 192.168.1.9:80 maxconn 1024 weight 5 check 

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

after it take effect, when i visit 192.168.1.5:8888 , it can visit the first server of nginx1. but when i visit 192.168.1.5:8888/abc, it reports :

////////////////////////////////////////////////////////

 404 Not Found nginx/1.17.9 

////////////////////////////////////////////////////////

Answer 1

A rudimentary configuration would look as follows:

frontend web.jerrywang.org bind 192.168.1.5:8888 use_backend api_servers if { path_beg /abc/ } # default_backend web_servers # The users will get 503 for anything else backend api_servers balance roundrobin cookie SERVERUSED insert indirect nocache option httpchk HEAD / default-server check maxconn 20 server server1 192.168.1.6:8888 cookie server1 server server2 192.168.1.7:8888 cookie server2