Hello Sander,

make sure you use "option http-keep-alive" as http mode, specifically
httpclose will cause issue with H2.

If that's not it, please share the configuration; also you may want to
try enabling proxy_ignore_client_abort in the nginx backend [1].



cheers,
lukas


[1] 
http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_ignore_client_abort

On 21 February 2018 at 15:29, Sander Klein <roe...@roedie.nl> wrote:
> Hi All,
>
> Today I tried enabling http/2 on haproxy 1.8.4. After enabling all requests
> to a certain backend started to give 400's while requests to other backend
> worked as expected. I get the following in haproxy.log:
>
> Feb 21 14:31:35 localhost haproxy[22867]:
> 2001:bad:coff:ee:cd97:5710:4515:7c73:52553 [21/Feb/2018:14:31:30.690]
> backend-name/backend-04 1/0/1/-1/4758 400 1932 - - CH-- 518/215/0/0/0 0/0
> {host.name.tld|Mozilla/5.0
> (Mac||https://referred.name.tld/some/string?f=%7B%22la_la_la%22:%7B%22v%22:%22thingy%22%7D%7D}
> {} "GET /some/path/here/filename.jpg HTTP/1.1"
>
> The backend server is nginx which proxies to a nodejs application. When
> looking at the request on nginx it gives an HTTP 499 error.
>
> Is this a known issue? Or, is this a new H2 related issue?
>
> Anyway I can do some more troubleshooting?
>
> Greets,
>
> Sander

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