2 replies

random 403 errors on workers outgoing fetch requests

We've been investigating a big issue on our platform for a few weeks. We're integrating with multiple accounting systems and sending a lot of data out to them. With our most popular integration

quickbooks

quickbooks

, we've been starting to receive a lot of 403 responses, seemingly randomly, since start of may.

Randomly means, we perform the request multiple times, 4x it fails with 403, then it just works with 200.

We've escalated the issue up to their internal tech team, but they assure us that our requests are not hitting their API. They've checked logs on multiple parts of their infrastructure.

This is how a response looks like. They say they don't use cloudflare services, so it must be our outbound request made from a cloudflare worker failing.

The server: https://quickbooks.api.intuit.com

{
    "body": "<html>\r\n<head><title>403 Forbidden</title></head>\r\n<body>\r\n<center><h1>403 Forbidden</h1></center>\r\n</body>\r\n</html>\r\n",
    "headers": {
      "cf-cache-status": "DYNAMIC",
      "cf-ray": "891beeccb61e9d54-DME",
      "connection": "keep-alive",
      "content-type": "text/html",
      "date": "Mon, 10 Jun 2024 19:57:51 GMT",
      "server": "cloudflare",
      "transfer-encoding": "chunked"
    },
    "status": 403,
    "statusText": "Forbidden"
  }

{
    "body": "<html>\r\n<head><title>403 Forbidden</title></head>\r\n<body>\r\n<center><h1>403 Forbidden</h1></center>\r\n</body>\r\n</html>\r\n",
    "headers": {
      "cf-cache-status": "DYNAMIC",
      "cf-ray": "891beeccb61e9d54-DME",
      "connection": "keep-alive",
      "content-type": "text/html",
      "date": "Mon, 10 Jun 2024 19:57:51 GMT",
      "server": "cloudflare",
      "transfer-encoding": "chunked"
    },
    "status": 403,
    "statusText": "Forbidden"
  }

Are we somehow hitting a limitation of cloudflare workers? Does someone have an advice on how we can further debug this? I've tried looking for the cf-ray in the security events with no avail. I'm pretty lost with this issue.

Bildschirmfoto_2024-06-11_um_12.31.03.png

random 403 errors on workers outgoing fetch requests

We've been investigating a big issue on our platform for a few weeks. We're integrating with multiple accounting systems and sending a lot of data out to them. With our most popular integration

quickbooks

quickbooks

{
    "body": "<html>\r\n<head><title>403 Forbidden</title></head>\r\n<body>\r\n<center><h1>403 Forbidden</h1></center>\r\n</body>\r\n</html>\r\n",
    "headers": {
      "cf-cache-status": "DYNAMIC",
      "cf-ray": "891beeccb61e9d54-DME",
      "connection": "keep-alive",
      "content-type": "text/html",
      "date": "Mon, 10 Jun 2024 19:57:51 GMT",
      "server": "cloudflare",
      "transfer-encoding": "chunked"
    },
    "status": 403,
    "statusText": "Forbidden"
  }

{
    "body": "<html>\r\n<head><title>403 Forbidden</title></head>\r\n<body>\r\n<center><h1>403 Forbidden</h1></center>\r\n</body>\r\n</html>\r\n",
    "headers": {
      "cf-cache-status": "DYNAMIC",
      "cf-ray": "891beeccb61e9d54-DME",
      "connection": "keep-alive",
      "content-type": "text/html",
      "date": "Mon, 10 Jun 2024 19:57:51 GMT",
      "server": "cloudflare",
      "transfer-encoding": "chunked"
    },
    "status": 403,
    "statusText": "Forbidden"
  }

random 403 errors on workers outgoing fetch requests

random 403 errors on workers outgoing fetch requests

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