When I try to update the favicon, I get a 500 response and redirected to the "Oops - an error has occurred" page. These are the headers for the request and response.
Request
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Content-Type: multipart/form-data; boundary=---------------------------135702987313219
Content-Length: 59935
Connection: keep-alive
Upgrade-Insecure-Requests: 1
TE: Trailers
Response
HTTP/2.0 500 Internal Server Error
server: AtlassianProxy/1.15.8.1
cache-control: no-cache, no-store, must-revalidate
content-type: text/html;charset=UTF-8
content-security-policy: frame-ancestors 'self'
strict-transport-security: max-age=315360000; includeSubDomains; preload
date: Fri, 14 Jun 2019 19:26:10 GMT
atl-traceid: 82272033004958b9
expires: Thu, 01 Jan 1970 00:00:00 GMT
x-xss-protection: 1; mode=block
x-content-type-options: nosniff
atl-confluence-via: h:confluence-prod-us-3-2.prod.atl-paas.net
x-confluence-request-time: 1560540370035
x-frame-options: SAMEORIGIN
X-Firefox-Spdy: h2
It's an ico file with transparency at 120x120. I've also tried a PNG with the same result.
