[Gows] - POST /api/sendFile to send a PDF document via WAHA, the API returns 500 Internal Server Error #1916
Description
When calling POST /api/sendFile to send a PDF document via WAHA, the API returns 500 Internal Server Error with a gRPC error:
2 UNKNOWN: failed to execute request:
Post "https://media-bom2-1.cdn.whatsapp.net/mms/document/...":
write tcp <internal-ip>:<port>-><remote-ip>:443:
write: connection reset by peer
Important:
- Sending image files works correctly.
- The issue occurs only when sending PDF documents.
Version
Output of GET /api/version:
{
"version": "2026.1.4",
"engine": "GOWS",
"tier": "PLUS",
"browser": null,
"platform": "linux/x64",
"worker": {
"id": null
}
}Request Payload
POST /api/sendFile
{
"chatId": "<redacted>@c.us",
"file": {
"mimetype": "application/pdf",
"filename": "filename.pdf",
"url": "https://<my-domain-redacted>/path/to/file.pdf"
},
"reply_to": null,
"caption": "string",
"session": "<redacted>"
}Response
{
"statusCode": 500,
"exception": {
"message": "2 UNKNOWN: failed to execute request: Post \"https://media-bom2-1.cdn.whatsapp.net/...\": write: connection reset by peer",
"code": 2,
"details": "connection reset by peer"
}
}Stack Trace Location
Failure occurs during:
WhatsappSessionGoWSPlus.sendMediaWhatsappSessionGoWSPlus.sendFile
Expected Behavior
PDF file should upload successfully to WhatsApp CDN and return a valid message response (same behavior as image uploads).