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Protocols

Out of the box k6 comes with support for the following protocols:

k6 will use HTTP/1.1 by default when it contacts a server. If, after connection, the server reports to k6 that it supports HTTP/2, k6 will upgrade the connection to HTTP/2 instead. This is all automatic - both the use of HTTP/1.1 initially and the potential protocol upgrade, and you don't have to do anything special when using k6 to enable either HTTP/1.1 or HTTP/2. You might want to verify which protocol is actually being used for a transaction though, which requires an extra step.

WebSockets is a little bit different, the structure of the test and the VU lifecycle is different.