Setting max concurrent HTTP requests per frontend

Hello,

I have 2+ servers running on one VM, and I want to only process one HTTP request at a time across all of them (they’re performing brief, mem and CPU-intensive work).

Protect Servers with HAProxy Connection Limits and Queues - HAProxy Technologies says if mode http is set, “the maxconn parameter on a server line … relates to the number of concurrent HTTP requests.”

That’s close to what I need, but maxconn in frontend or global seems to mean connections, not requests.

Is there some way to achieve this? Thanks-

Two configs I’ve tried:

global
 	maxconn 1

frontend MyFrontend1
	bind	127.0.0.1:3001
	default_backend	rpc_1

backend rpc_1
   mode http
   server s1 127.0.0.1:31234

frontend MyFrontend2
	bind	127.0.0.1:3002
	default_backend	rpc_2

backend rpc_2
   mode http
   server s2 127.0.0.1:31235

frontend rpc
	mode http
	bind :3001
	bind :3002
	maxconn 1
	use_backend rpc_1 if { dst_port 3001 }
	use_backend rpc_2 if { dst_port 3002 }

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