Re: [whatwg/fetch] Request with GET/HEAD method cannot have body. (#551)

HTTP allows a request body on GETs syntactically so that message parsing is generic; it doesn't say that a body has any meaning on a GET. 

So, anyone using a body on a GET is effectively "off the reservation"; they're not longer using HTTP, but defining their own private protocol.  Since Fetch is an API for HTTP, it's entirely reasonable for it not to allow this.

More practically, using bodies on GETs tends to trigger interop problems with proxies, CDNs, servers, etc. While it might work in the lab or even on the Internet under controlled conditions, using it at scale is very likely to bump into this. For example, users who have virus scanning proxies are likely to have problems, since they tend to have very conservative implementations.


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