opds login broken?

[josh.p.23]

I am using the latest calibre 3.2.1 under apache2 on Ubuntu 16.04 fully updated. I'm serving calibre-server with mod_rewrite, the relevant section of my virtual host looks like this:

	RewriteEngine on
	RewriteCond %{REQUEST_URI} !/\.well-known/.*
	RewriteRule ^(.*) http://localhost:8080/$1 [proxy]
	RewriteCond %{REQUEST_URI} !/\.well-known/.*
	RewriteRule ^ http://localhost:8080 [proxy]
#	SetEnv force-proxy-request-1.0 1
#	SetEnv proxy-nokeepalive 1

I load calibre-server with a systemd service file that contains this

[Unit]
Description=Calibre Service
After=network.target

[Service]
Type=forking
PIDFile=/var/run/calibre-server.pid
ExecStart=/usr/bin/calibre-server \
        --daemonize \
	--disable-use-bonjour \
	--enable-auth \
	--listen-on 127.0.0.1 \
	--log=/var/log/calibre-server.log \
	--max-request-body-size=65 \
        --max-opds-items=30 \
        --max-opds-ungrouped-items=100 \
        --port=8080 \
        --pidfile=/var/run/calibre-server.pid \
	--userdb /home/username/lib/users.sqlite \
	/home/username/lib/default/ \
	/home/username/lib/pdf/
[Install]
WantedBy=multi-user.target

This seems to work well with the browser, but when I attempt to load the opds catalog at http://example.com/opds/ in fbreader or moon + in android I get the error:
length=1;index=1
This only happens when I have auth on. If I try to run without auth, the opds feed loads right up, and when I access the auth protected feed in a browser the login prompt appears, and there is no problem.

So... help?

[kovidgoyal]

1) If you are using an SSL enabled reverse proxy which you seem to be, then use --auth-mode=basic

2) length=1;index=1 isn't an actual error so unless you can get better error messages, I'm not sure how to help you. OPDS has no separate authentication from the rest of the server.

3) You can try using curl to test the authentication outside a browser.

[josh.p.23]

auth-mode=basic

did the trick.
I don't know how I missed that, I poured over

$ caliber-server --help

after upgrading to v3.

Time to go read the docks a bit closer.

Thank you.