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I have made this article to show how to rate limit the file upload HTTP requests on the file upload URL for a source IP address.
The first condition matches the URL path for file uploads, with a qualifier for the POST method, which is typically used for file uploads.
The second condition matches the "Content-Type" header value, which is usually "multipart/form-data" for file uploads.
Optional: To limit only successful file uploads, you can add an extra condition that checks the HTTP response code. I found it easier using "http-rsp-reason" with matching "OK" which is returned after the 200 response. This signature is in direction of server to client as it is in the response and you just add it to the combination signature. You can try adding this under the file upload signature with direction set to "both" but I saw some issues doing that (During testing, it was observed that the "time" option appears to evaluate each individual signature within the combination signature separately. For example, to achieve a rate limit of 5 requests per minute, a rate of 15 might be required).
I hope this guide helps you implement effective rate-limiting policies for file uploads on your network.
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08-11-2025
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