What component might emit 'Request max total header size exceeded'
I am posting documents into paperless-ngx via REST api. For some pdf documents the API reliably responds with
{"detail":"Multipart form parse error - Request max total header size exceeded."}
I checked one of the offending documents and found it to be a normal, valid PDF of about 180 kb size. There should not be too much fuss about it, yet I have that error.
Now I am wondering where this error might come from and how to get around it. Does it come from GUnicorn, Django or maybe the application itself?