502 Bad Gateway from nginx

[unforgettableid]

Hi!

I stumbled across your bike-share personal heatmap website (https://imadm.ca/bikeshare/personal_heatmap/). It looks useful, but it doesn't seem to work for me. No matter what I put into the box -- whether it's my Trips page's full outerHTML or simply the word test -- I get the same error message:

502 Bad Gateway

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nginx/1.14.2

I think the response headers may be completely irrelevant, but here they are in case you need them:

HTTP/1.1 502 Bad Gateway
Server: nginx/1.14.2
Date: Sun, 14 Jun 2020 13:50:54 GMT
Content-Type: text/html
Content-Length: 575
Connection: keep-alive

I'm using Chromium 83.x on 32-bit Xubuntu 18.04.x. I tried disabling uBlock Origin, but this didn't help.

Thank you for reading this!