Question 1

How do I set up distributed load testing with Cassowary?

Accepted Answer

Use Kubernetes by defining a Job with parallelism in a YAML file, as shown in the README. Apply it with kubectl to run multiple Cassowary instances simultaneously across nodes for scaled testing.

Question 2

Cassowary vs k6: which is better for CI/CD integration?

Accepted Answer

Cassowary is simpler with a single binary and direct metric exports to Prometheus or CloudWatch, making it easier to drop into pipelines. k6 offers more scripting flexibility but requires additional setup for similar integrations.

Question 3

Can Cassowary test POST endpoints with JSON payloads?

Accepted Answer

Yes, use the --postfile flag to specify a JSON file containing the payload. Cassowary supports POST, PUT, and PATCH methods with data from files for load testing REST APIs.

Question 4

How to export metrics to Prometheus from Cassowary?

Accepted Answer

Add the -p flag with your Prometheus PushGateway URL during the run command. Cassowary will push metrics like request duration and error rates to the gateway for ingestion.

Question 5

Does Cassowary support authentication with JWT or OAuth?

Accepted Answer

You can add custom HTTP headers using the -H flag to include tokens like JWT, but Cassowary has no built-in support for OAuth flows or automatic token generation, requiring manual setup.

Question 6

How to generate a histogram report after a load test?

Accepted Answer

Include the --histogram flag in your command, and Cassowary will automatically create a hist.png file in the current directory visualizing the distribution of request durations in milliseconds.

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