Moving lots of spam to Trash gives 414 "Request-URI too large"

[gtandersen]

Describe the bug
When clicking “Move all to trash” on over 1000 messages in the Spam folder an error 414 “Request-URI too large” is generated.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://runbox.com/app
2. Ensure the Spam folder has a large number of messages
3. Click on "Move all to trash" next to the Spam folder
4. Observe the error

Expected behavior
It should be possible to move any number of messages without any error.

A possible solution is to move the message IDs should from the DELETE request URL to the body of the request.

This error does appear when moving a large number of messages between folders.

Ref: https://community.runbox.com/t/moving-lots-of-spam-to-trash-gives-414-request-uri-too-large/1736

See also #1555.

[jez9999]

I now appear to be getting a 400 Bad Request instead when I try this. But, still an error.