OWASP HTTP Post Tool
From OWASP
The OWASP Testing Guide v3 4.9 Denial of Service Testing outlines numerous areas of Denial of Service. In version 4.0 additional updates will be made. This QA tool was created to allow you to test your web applications to test availability concerns from HTTP GET and HTTP POST denial of service attacks - This tool is GPLv3
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Excellent write up of the issue(s) and some of the mitigation options ModSecurity Blog
