Re: [whatwg/fetch] Add proxy support to obtain a connection (#1259)

> I'm not sure what if anything we need to write to handle complex cases like when `FindProxyForURL()` returns something like `"PROXY proxy:3128; PROXY proxy2:8080; DIRECT"`. In this case
> 
> 1. Try `proxy:3128` for "example.com"
> 2. If connection failed, try `proxy2:8080` for "example.com"
> 3. If connection failed, do a host lookup on "example.com"
> 4. Attempt connection to one or more of the IPs returned by the host lookup.



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