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

> 
> 
> > So imagine if the fetch API added this capability to have a body with a GET request. It might not even work on some operating systems anyway, so browsers would be forced to not support it for the sake of consistency.
> 
> This is not true, it's the other way around.
> If The Fetch API added this capability, browsers and other frameworks would have to start supporting it eventually. Yes, it would be a somewhat painful time at first, but not more painful than it currently is now limiting peoples applications for arbitrary reasons.

Exact !

What we can be certain of is that browsers, OS, proxies, ... will never bother implementing something that is explicitly forbidden by the standard.

The way it works is :

1) Standard says something is fine
2) It is slowly implemented on some products
3) It's implemented enough that it become used with a polyfill/compatibility wrapper
4) As it is more and more used, it gets implemented on every products
5) It is used raw without a polyfill/compatibility wrapper

Being allowed by the standard is the first step.

The only reverse situation is when you have a step 0)
=> A nice missing feature that is not mentioned in the standard is added to some products

But it will never happen if that feature is forbidden by the standard.

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