"Hostname" fields absent from http requests for connectivity checking

The Nextcloud android apps has some feature break. The problem coming from the connectivity checking who donā€™t send the hostname.
Example of HaProxy (frontend) logs :
In this config, <NOSRV> indicate a bad or absent hostname in the http request. If the server donā€™t know which virtualhost the user want to speak, itā€™s not possible, :stuck_out_tongue:.

Sep 30 18:28:36 FrontendMachine haproxy[22666]: 192.168.42.42:43681 [30/Sep/2019:18:28:36.009] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 8/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:29:01 FrontendMachine haproxy[22666]: 192.168.42.42:47003 [30/Sep/2019:18:29:01.442] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 8/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:29:02 FrontendMachine haproxy[22666]: 192.168.42.42:39120 [30/Sep/2019:18:29:02.104] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 1/-1/-1/-1/1 403 197 - - PR-- 9/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:29:02 FrontendMachine haproxy[22666]: 192.168.42.42:34332 [30/Sep/2019:18:29:02.132] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 9/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:29:21 FrontendMachine haproxy[22666]: 192.168.42.42:44188 [30/Sep/2019:18:29:21.078] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 7/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:29:22 FrontendMachine haproxy[22666]: 192.168.42.42:41739 [30/Sep/2019:18:29:22.161] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 7/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:29:47 FrontendMachine haproxy[22666]: 192.168.42.42:52800 [30/Sep/2019:18:29:47.869] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 7/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:29:48 FrontendMachine haproxy[22666]: 192.168.42.42:44679 [30/Sep/2019:18:29:48.446] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 7/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:29:52 FrontendMachine haproxy[22666]: 192.168.42.42:47619 [30/Sep/2019:18:29:52.933] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 6/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"
Sep 30 18:31:27 FrontendMachine haproxy[22666]: 192.168.42.42:46080 [30/Sep/2019:18:31:27.709] Frontend_HTTP~ Frontend_HTTP/<NOSRV> 0/-1/-1/-1/0 403 197 - - PR-- 5/3/0/0/0 0/0 "GET /index.php/204 HTTP/1.1"

Result : streaming and access to files working, but automated sending (contacts backup & images/pics) are break, when click on the pics for manuallyforce sending it, the software indicate ā€œConnexion errorā€ just under the title of the pics.

PS : posted on github via tmp account : https://github.com/nextcloud/android/issues/4588