Response body handling differs from other runtimes

[chrisfarber]

I've found a case where the behavior of the JS Compute runtime differs from other runtimes.

let res = new Response("ORIGINAL_BODY_CONTENT");

res = new Response(res.body, res);

const body = await res.arrayBuffer();
res = new Response(body, res);

In the other runtimes I’ve tested (node, webkit, chrome), the final res’s body will be "ORIGINAL_BODY_CONTENT", however, in Compute, it will be empty. Here’s a repository that demonstrates this: https://github.com/fastly/cfarber-response-body-loss-repro/

[zkat]

https://github.com/fastly/js-compute-runtime/blob/main/runtime/fastly/builtins/fetch/request-response.cpp#L778-L781

lol

well, that might do it.

I'm gonna keep investigating to make sure this is it.