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by kvalekseev 1766 days ago
From HAProxy mailing list about http_buffer_request option https://www.mail-archive.com/haproxy@formilux.org/msg23074.h...

> In fact, with some app-servers (e.g. most Ruby/Rack servers, most Python servers, ...) the recommended setup is to put a fully buffering webserver in front. Due to it's design, HAProxy can not fill this role in all cases with arbitrarily large requests.

A year ago I was evaluating recent version of HAProxy as buffering web server and successfully run slowloris attack against it. Thus switching from NGINX is not a straightforward operation and your blog post should mention http-buffer-request option and slow client problem.