A system for automatic stability determination and deployment of discrete parts of a profile representing normal behavior to provide fast protection of web applications is disclosed. The system, in response to a sensor collecting from HTTP requests sent by the clients to the web application installed on the protected device, automatically creates for a web application a profile with discrete parts that will represent normal behavior so that deviations from the profile can be considered anomalous. The system automatically determines that a first of the discrete parts of the profile has become stable. The system then automatically deploys the first discrete part of the profile to the sensor that now will compare with the first discrete part of the profile subsequent HTTP requests sent by the clients to the web application to detect deviations from the normal behavior represented by the first discrete part.