"An error occurred while attempting to save your data."

[dhicks]

I see this error message frequently when I'm updating a list. I have uBlock and Privacy Badger browser extensions running, but neither is reporting that it's blocking anything. (Privacy Badger is preventing fonts.gstatic.com from setting cookies, but the error message still appears when this protection is disabled.)

Checking the console, here's what the response headers look like:

XHRPOSThttps://lighterpack.com/saveLibrary/
[HTTP/1.1 400 Bad Request 363ms]

	
POST
	https://lighterpack.com/saveLibrary/
Status400
Bad Request
VersionHTTP/1.1
Transferred339 B (69 B size)
Referrer Policyno-referrer-when-downgrade

    	
    HTTP/1.1 400 Bad Request

    Date: Wed, 24 Mar 2021 00:03:59 GMT

    Server: Apache/2.4.7 (Ubuntu)

    X-Powered-By: Express

    Content-Type: application/json; charset=utf-8

    Content-Length: 69

    ETag: W/"45-u6oeQtZyO5ZwgWsefQDlMV7hY1o"

    Vary: Accept-Encoding

    Connection: close

And the request:

    POST /saveLibrary/ HTTP/1.1

    Host: lighterpack.com

    User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:86.0) Gecko/20100101 Firefox/86.0

    Accept: */*

    Accept-Language: en-US,en;q=0.5

    Accept-Encoding: gzip, deflate, br

    Referer: https://lighterpack.com/

    Content-Type: application/json

    Origin: https://lighterpack.com

    Content-Length: 50522

    DNT: 1

    Connection: keep-alive

    Cookie: lp=cc8141d86a237ba29af4a144a1f079f879bb69ca926f60d0afb6428f283726287c609bc77a79c7b6ace3621b52708e13

    Sec-GPC: 1

    Pragma: no-cache

    Cache-Control: no-cache