When attempting to add an additional project to our list of applicable projects, we ran into a HTTP 400 error.
On doing some investigation, the problem was tracked down to the fact that the URL being attempted was sufficiently long as to be hitting the Tomcat maxHttpHeaderSize (defaults to 8192).
It seems like appending "&applicableProjects=12345" or similar, for each project, makes this prone to this kind of error, as once you get to sufficiently many projects, further additions will fail.
I didn't find anything in docs about this, so figured it might be worth raising this with you.
Is/was this a known issue?