I explicitly tested this with a 50KiB limit on beta EDDN service:
1. 49973 byte message does make it through, in plain text.
2. 51312 byte message, no compression, 413.
3. Same message, with gzip compression, 200
4. The 149242 byte file I based those extra ones on also makes it
through when compressed.
Indeed the Gateway logging cites the compressed-body size. `bottle`
isn't looking at the message and magically decompressing it in order to
check plain-text size.