Got one server with multiple HTTP services?

Want a scheme like:

    myhost.net/
      -> 127.0.0.1:8080
    myhost.net/app1
      -> 127.0.0.1:8081
    myhost.net/app2
      -> 127.0.0.1:8082
 
OKAY!

Assuming haproxy.cfg's global and defaults sections to be stock:

    frontend http-in
            bind *:80
            # our hosts
            acl match_default path_beg /
            acl match_app1 path_beg /app1
            acl match_app2 path_beg /app2
            ## map our hosts to the appropriate backends
            use_backend host_app1 if match_app1
            use_backend host_app2 if match_app2
            use_backend host_default if match_default
    
    backend host_default
            server node0 127.0.0.1:8080
    backend host_app1
            server node0 127.0.0.1:8081
            reqrep ^([^\ ]*\ /)app1[/]?(.*)     \1\2
    
    backend host_app2
            server node0 127.0.0.1:8082
            reqrep ^([^\ ]*\ /)app2[/]?(.*)     \1\2


There ya go!

How about a scheme like:

    request for *
      -> 10.0.0.1:8081
    request for app1.net
      -> 10.0.0.2:80
    request for app2.net
      -> 10.0.0.3:80

Try this!

    frontend http-in
            bind *:80
            # our hosts
            acl match_app1 hdr(host) -i app1.net
            acl match_app2 hdr(host) -i app2.net
            ## map our hosts to the appropriate backends
            use_backend host_default
            use_backend host_app1 if match_app1
            use_backend host_app2 if match_app2
    
    backend host_default
            server node0 10.0.0.1:8081
    backend host_app1
            server node0 10.0.0.2:80
    
    backend host_app2
            server node0 10.0.0.3:80