Don't set connection close headers when they are already set on the Response #143

	name: CI

	on:
	push:
	branches: ["master"]
	pull_request:
	branches: ["master"]

	jobs:
	tox:
	runs-on: ubuntu-latest
	strategy:
	max-parallel: 7
	matrix:
	python-version:
	- 3.8
	- 3.9
	- "3.10"
	- "3.11"
	- "3.12"
	- pypy-3.9
	- pypy-3.10

	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	allow-prereleases: true
	- name: Install tox
	run: \|
	python -m pip install --upgrade pip setuptools
	pip install --upgrade tox tox-gh-actions
	- name: Initialize tox envs
	run: \|
	tox --parallel auto --notest
	- name: Test with tox
	run: \|
	tox --parallel 0
	- uses: codecov/codecov-action@v3
	with:
	file: ./coverage.xml

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