RStudio when launched without Singularity is having strange troubles with authentication

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I to am struggling with this, trying to run rstudio server without using a container or proot. I have the server starting ok, but can’t get this token thing to work at all. Trying to follwo the timeline above and get everything in the right place I have:

view.html.erb:

<script>
  document.cookie = "csrf-token=<%= csrf_token %>; path=/rnode/<%= host %>/<%= port %>; secure";
</script>
<form action="/rnode/<%= host %>/<%= port %>/auth-do-sign-in" method="post" target="_blank">
  <input type="hidden" name="username" value="<%= ENV["USER"] %>">
  <input type="hidden" name="password" value="<%= password %>">
  <input type="hidden" name="staySignedIn" value="1">
  <input type="hidden" name="appUri" value="">
  <input type="hidden" name="csrf-token" value="<%= csrf_token %>"/>
  <button class="btn btn-primary" type="submit">
    <i class="fa fa-registered"></i> Connect to RStudio Server
  </button>
</form>

submit.yml:

conn_params:
    - csrf_token

and before.sh.erb:

<%-
  require 'securerandom'
  csrftoken = SecureRandom.uuid
-%>
export csrf_token="<%= csrftoken %>"

As noted, the server starts fine but when I view the source of the launch bit in firefox developer tools it shows the hidden csrf-token with value="" and auth to the rstudio-server instance fails. What bits am I missing here?