Atomicorp.com WAF Rules: Content-Length HTTP header is not numeric
A valid Content-Length header must contain a numeric valid. If this rule was triggered it means a non-numeric and therefore invalid value was found. This can be indicative of an attack.
There are no known False Positives for this. Any request that includes a non-numeric valid in this field would never work correctly.
If you believe this is a false positive, it is recommended that you report this to our security team can 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.