Open source


A HTTP Fault describes the characteristics of the faults to be injected in the HTTP requests served by a target.

A HTTP fault is described by the following attributes:

averageDelaystringaverage delay added to requests represented as a string (default 0)
delayVariationstringvariation in the injected delay (default 0)
errorBodystringbody to be returned when an error is injected
errorCodenumbererror code to return
errorRatenumberrate of requests that will return an error, represented as a float in the range 0.0 to 1.0 (default 0.0)
excludestringcomma-separated list of urls to be excluded from disruption (e.g. /health)
portnumberport on which the requests will be intercepted


averageDelay and delayVariation are applied to all requests affected by the fault, regardless of the value of errorRate. errorCode is returned only to a fraction of requests defined by errorRate.


This example defines a HTTP fault that introduces a delay of 50ms in all requests and returns an error code 500 in 10% of the requests.

const fault = {
  averageDelay: '50ms',
  errorCde: 500,
  errorRate: 0.1,