xk6-websockets

This extension adds a PoC Websockets API implementation to k6.

This is meant to try to implement the specification as close as possible without doing stuff that don't make sense in k6 like:

1. not reporting errors
2. not allowing some ports and other security workarounds
3. supporting Blob as message

It supports additional k6 specific features such as:

• Custom metrics tags
• Cookie jar
• Headers customization
• Support for ping/pong which isn't part of the specification
• Compression Support (The only supported algorithm currently is deflate)

It is implemented using the xk6 system.

Requirements

• Golang 1.17+
• Git
• xk6 (go install go.k6.io/xk6/cmd/xk6@latest)

Getting started

1. Build the k6's binary:

$ make build

2. Run an example:

$ ./k6 run ./examples/test-api.k6.io.js

Discrepancies with the specifications

• binaryType is "ArrayBuffer" by default instead of "Blob" and will throw an exception if it's tried to be changed as "Blob" is not supported by k6.