FingerprintPluginV10 engine: POST /scripts/FingerprintPluginV10/last/data returns 502 Bad Gateway

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  • playwright-with-fingerprints v1.6.3 (engine 27.8.1, script FingerprintPluginV10)
    fails on every plugin.fetch() with "Json parse error : illegal value".

    Root cause found (verified by MITM capture + direct requests from our machine):

    The engine script POSTs to
    https://bablosoft.com/scripts/FingerprintPluginV10/last/data
    (multipart/form-data, fields: email, scriptsign) during startup and expects a
    JSON response. The server currently responds:

    HTTP/1.1 502 Bad Gateway
    Server: nginx/1.18.0 (Ubuntu)
    <html><head><title>502 Bad Gateway</title>...

    The engine then fails to JSON.parse() this HTML page, producing
    "Json parse error : illegal value".

    Direct reproduction from our side (same endpoint, same POST):
    3 attempts -> 502, 502, 502 (latency 18.7s / 1.0s / 19.3s - backend unstable).

    Other service endpoints are healthy: /checkkey returns valid:true,
    /preview returns valid fingerprint JSON.

    This looks like a server-side (nginx upstream) outage on your side, affecting
    all users of the plugin, not specific to our key/IP (key is valid, IP is
    whitelisted).

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