Clicking attachment would result nginx 500 Internal Server Error

Hi @KajMagnus, after the last deployment (on premise, v0.6.9-WIP-3-75eef8fa4), we are no longer able to open/save attachments. Following the attachment link would throw an internal server error.

Here's what I see in the console (domain name edited)

Error calling /-/pubsub/subscribe/1-100?reqNr=1: {"xhr":{}}, details:  slim-bundle.min.js:10:269972
	c/< https://domain.com/-/assets/266/slim-bundle.min.js:10:269972

The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol.

nginx error log entry

2018/08/09 10:25:34 [error] 12#12: *2604 lua entry thread aborted: runtime error: access_by_lua(server-locations.conf:162):2: http2 requests not supported yet
stack traceback:
coroutine 0:
        [C]: in function 'capture'
        access_by_lua(server-locations.conf:162):2: in function <access_by_lua(server-locations.conf:162):1>, client: 80.146.228.71, server: _, request: "GET /-/u/uzwt435xvo/4/w/6a/7rtdl45lvs57sexqwlvv75hpui5fxx.pdf HTTP/2.0", host: "domain.com", referrer: "https://domain.com/-21/topic"