Hi,
I have 3 backend servers, each accepting different form of HTTP queries: http://backend1.server.tld/service1.php?q=... http://backend1.server.tld/service2.php?q=... http://backend2.server.tld/index.php?query=...&subquery=... http://backend3.server.tld/image/49b8c0d9ff Each backend server returns a different response based on either: - the URI path (the left part of the URI before the question mark) - the query string (the right part of the URI after the question mark) - or the combination of both I wanted to set up a common caching cluster (using 6 Squid servers, each configured as reverse proxy for those 3 backends) and have HAProxy balance the queries among the Squid servers based on URL. I also wanted to achieve hight cache hit ration on each Squid server and send the same queries to the same Squid servers. Initially I was considering using the 'balance uri' algorithm, but that would not work as in case of backend2 all queries would go to only one Squid server. The 'balance url_param' would not work either as it would send the backend3 queries to only one Squid server. So I thought the simplest solution would be to use 'balance uri', but to calculate the hash based on the whole URI (URI path + query string), instead of just the URI path. So I added a new "withquerystring" parameter for the 'balance uri' algorithm which does exactly what I just described. My configuration looks like this: frontend proxy *:8080 default_backend proxy backend proxy balance uri includequerystring server squid1 192.168.1.1 check server squid2 192.168.1.2 check server squid3 192.168.1.3 check server squid4 192.168.1.4 check server squid5 192.168.1.5 check server squid6 192.168.1.6 check The patch enabling this includequerystring "feature" is very simple and is attached to this email. It is backwards compatible, without the 'includequerystring' it still behaves as before. With 'includequerystring' parameter it uses the whole URI instead. Is this something other people could benefit from? If so, please review the pach and include it into HAProxy source base. The patch is based on 1.4.20 source base. Thank you, Happy server load balancing, Oskar
0001-MINOR-balance-uri-include-query-string-to-hash-calcu.patch
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