how haproxy define dynamic backend server - dynamic

Question

Recently I have a project that need use haproxy,after I readed the config doc I found the acl.
with the acl I can filter some backends by the request url,that's cool.
But not enough,I want generate a dynamic backend server by the url params which I matched,for example:
acl dynamic_ser url_reg /*.(10.0.0.1|10.0.0.2)$
use_backend dynamic_server if dynamic_ser
backend dynamic_server
balance leastconn
option httpclose
server node1 10.0.0.1:8080
server node2 10.0.0.2:8080
and for my question,the url is dynamic sometimes may be /path?ip=10.0.0.1 and
sometimes may like this /path?ip=10.0.0.1&10.0.0.2 and may /path?ip=10.0.0.1&10.0.0.2&10.0.0.3 also.
and everytime I want get the backend server depend on the matched,of couse I can define these servers once a time.but I don't think it's good,any method can I use?

Answer 1

Remember that & is a delimiter between key-value pairs, so /path?ip=10.0.0.1&10.0.0.2 is mapped to {'ip':'10.0.0.1','10.0.0.2':null}