I'm trying to upload activities to Strava. I've made sure the user I'm doing it with has the right permissions (`activity:write`). When I perform the uploaded, using a gzipped tcx file as content, I get a 500 Internal Server from the Strava API.
The body just contains:
500 Internal Server Error
If you are the administrator of this website, then please read this web application's log file and/or the web server's log file to find out what went wrong.
Has anybody seen this before (and been able to fix it)?