Known differences

As of 1.x release

Topics such as cross-origin, content security policy, mixed content, service workers are ignored, given our server-side context.
Url input must be an absolute url, using either http or https as scheme.
On the upside, there are no forbidden headers, and res.url contains the final url when following redirects.
For convenience, res.body is a transform stream, so decoding can be handled independently.
Similarly, req.body can either be a string or a readable stream.
Also, you can handle rejected fetch requests through checking err.type and err.code.
Only support res.text() and res.json() at the moment, until there are good use-cases for blob.
There is currently no built-in caching, as server-side caching varies by use-cases.

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