WAF 390616

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Rule ID



Active rule currently published.

Alert Message

Atomicorp.com WAF Rules: POST request must have a Content-Length header


This rule detects to see if a POST request has a Content-Length header. Per the RFC, a valid Content-Length is required on all HTTP POST requests.

False Positives

No known false positives. If you see this behavior it is caused by either a buggy, non-compliant application, or it may be part of an attack.

It is not recommended that you disable this rule if you have a false positive. If you believe this is a false positive, please report this to our security team to determine if this is a legitimate case, or if its clever attack on your system. Instructions to report false positives are detailed on the Reporting False Positives wiki page. If it is a false positive, we will fix the issue in the rules and get a release out to you promptly.

Tuning Guidance

If you know that this behavior is acceptable for your application, you can disable this rule for that application. Please see the Tuning the Atomicorp WAF Rules page for basic information.

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