BTSync / BitTorrent Sync behind nginx

gistfile1.nginxconf

# take one

# subdirectory (one server, multiple services)
location /btsync/ {
         rewrite ^/btsync/gui(.*) /btsync$1 last;
         proxy_pass http://127.0.0.1:8888/gui/;
         proxy_redirect /gui/ /btsync/;
         proxy_buffering off;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
}

# standalone (one server, one service)
location / {
         proxy_pass http://127.0.0.1:8888/;
         proxy_buffering off;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
}

Warning: broken since 1.1.69!

I changed mine to just use the /gui/ as the root and it works fine:

    # btsync
location /gui/ {
            proxy_pass http://192.168.1.31:38888/gui/;
        proxy_buffering off;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

I added

location /btsync/ {
         rewrite ^/btsync/gui(.*) /btsync$1 last;
         proxy_pass http://127.0.0.1:8888/gui/;
         proxy_redirect /gui/ /btsync/;
         proxy_buffering off;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
}

location /gui/ {
        proxy_pass http://127.0.0.1:8888/gui/;
        proxy_buffering off;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

I can open btsync with http://ip:port/btsync

Ver 2.7.2 work with

location /btsync/ {
    proxy_pass http://127.0.0.1:8888/gui/;
    proxy_buffering off;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
}