attempting to change display name results in 403 without any further context

[mdaniel]

1. navigate to Profile
2. attempt to change Display name
3. press save
4. observe the 403 (the request is shown in the PUT below)
5. observe the page reloads without the name changing

I right-clicked on the bogus PUT, said "Copy as cURL", elided the Cookie, changed the UUID in userId but otherwise this is what generated the 403. The response was content-length: 2 with {} so nothing helpful there

curl 'https://www.linen.dev/api/profile' -X PUT  \
  -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:108.0) Gecko/20100101 Firefox/108.0'  \
  -H 'Accept: */*'  \
  -H 'Accept-Language: en-US,en;q=0.5'  \
  -H 'Accept-Encoding: gzip, deflate, br'  \
  -H 'Referer: https://www.linen.dev/s/linen/t/2931844/I-m-also-guessing-my-forum-username-is-based-on-the-portion-'  \
  -H 'Content-Type: application/json'  \
  -H 'Origin: https://www.linen.dev'  \
  -H 'DNT: 1'  \
  -H 'Connection: keep-alive'  \
  -H 'Cookie: __Secure-linen.session-token=eyJhb...' \
  -H 'Sec-Fetch-Dest: empty'  \
  -H 'Sec-Fetch-Mode: cors'  \
  -H 'Sec-Fetch-Site: same-origin'  \
  -H 'Pragma: no-cache'  \
  -H 'Cache-Control: no-cache'  \
  -H 'TE: trailers' \
  --data-raw '{"userId":"cafebabe-aaaa-bbbb-cccc-cafebabe0000","displayName":"mdaniel"}'

[emilos]

Thanks @mdaniel !