Adding Brotli Support - #598

Thx for the PR, I will into merging it.

Just one request: could you change the tests to use skip on nodejs version without brotil support, instead of faking a pass by fallback to gzip?

Seems like "should ignore invalid headers" test gone wrong in Node 12 @bitinn .

• gzip/skip Request has been completed.

@hlthi I suspect node 12 has changed how they handle invalid headers, so this test now fails on test/server.js, do you have node 12 installed, can you verify the issue exists on your local machine?

The PR itself looks good, but I will need to fix the node 12 issue first.

Possible problems

1. Switch default parser to llhttp

   Maybe new http parser dont know what to do invalid characters :(

2. HTTP2 doesnt support invalid header

Header field-names must only contain one or more of the following ASCII characters: a-z, A-Z, 0-9, !, #, $, %, &, ', *, +, -, ., ^, _, (backtick), |, and ~.
`
But it isn't http2 so I eliminate that.

Debug err

{
  "bytesParsed": 171,
  "code": "HPE_INVALID_HEADER_TOKEN",
  "reason": "Invalid header value char"
}

Investigate in LLHTTP,

https://github.com/nodejs/llhttp/blob/7596c6456d38bfa8a60fddddf162212527462b45/src/llhttp/http.ts#L494-L499

LLHTTP waiting \r and \n ; but show \x07 and boom.

I try on macOS mojave with node 12

$ npm version | grep http_parser
http_parser: '2.8.0',

@bitinn

thx for the PR, released as 2.4.0