PR-URL: #203

The function now directly returns the existing buffer if the input is already a buffer,
eliminating the need for a negated condition. This improves code readability and
maintains functionality by ensuring that non-buffer inputs are converted to a buffer
using the specified encoding.

* fix: change usage of _header to headersSernt

* improve logic

* update history

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Co-authored-by: Sebastian Beltran <bjohansebas@gmail.com>

* Add failing tests for http2

* Add support for http2
The change just removes the usage of undocumented http API and instead uses the proper writeHead method

* Remove arrow function in tests

* Conditionally run http2 tests if http2 is available

* Fix port in tests to be assigned automatically

* Change http2 test usage to describe.skip if no http2 available

* Fix closing the http2 connections to prevent possible exceptions

* Fix closing the request first, then the client, then the server

* Fix closing for v8.x and v9.x

* fix tests not draining data for http2 requests, resulting in timeouts in node v10.4 onwards

* fix: 🐛 assert.equal error

* fix: 🐛 remove console.log's and timeout, let build fail

* Apply suggestions from code review

Co-authored-by: Lam Wei Li <lam_wei_li@hotmail.com>

* fixed lint

* fix: an issue where test hangs when assertion fails in http2 as http2server is not closed

* refactor: use http2.constants instead of hard-coded strings in http2 test

* Node.js 0.8 compatible

* fix lint issue

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Co-authored-by: Moritz Peters <maritz.peters@gmail.com>
Co-authored-by: Moritz Peters <moritz@mpeters.biz>
Co-authored-by: Lam Wei Li <lam_wei_li@hotmail.com>
Co-authored-by: Sebastian Beltran <bjohansebas@gmail.com>

* add test for default encoding

* add functionality

* support *

* add docs

* fix logic

* change defaultEncoding to enforceEnconding

* sort conditional

* Added support for brotli ('br') content-encoding

* Update README.md

* Update README.md

* Update README.md

* Apply default value also when params is specified

* Increase coverage for specifying params

* Updated brotli detection method

* Prefer br over gzip and deflate

* feat: use "koa-compress" logic to determine the preferred encoding

* test: adding one more test case br/gzip with quality params

* chore: fix linting errors

* fix: hand write encodings lib to be compatible with node 0.8

* Fix: fixing lint errors in new lib

* Fix: fixing lint errors in new lib

* implemented required encoding negotiator without 3rd party dependency

* fix

* use negotiator

* improve negotiateEnconding

* fix support

* update history

* add new test

* add new test

* Update test/compression.js

Co-authored-by: Wes Todd <wes@wesleytodd.com>

* improve parse options

* don't directly manipulate the object.

* remove .npmrc

* use object assign in params

* test: add test for enforceEnconding

* deps: remove  object-assign

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Co-authored-by: Daniel Cohen Gindi <danielgindi@gmail.com>
Co-authored-by: Nick Randall <nicksrandall@gmail.com>
Co-authored-by: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Co-authored-by: Wes Todd <wes@wesleytodd.com>

* docs: improve readme

* funding?

* some work

* remove some things

* docs: add funding and keywork field

* remove funding