I've attempted to add a test for this reuse of the HttpContext, and haven't been able to reproduce any issues yet (although the test case is pretty small) -- so maybe it actually does work?

but still need to look into the other CI failures.

summary of the changes:

• factory can now be passed to ProxyAgent again, which was needed to get tests using MockAgent etc working. By default, it will use something lifted from Agent.js's defaultFactory, which takes options.connections into account to decide whether to creates a Pool or a Client.
• Http1ProxyWrapper no longer reuses the existing connection to the Proxy, but instead creates a new one, and retains it for the life time of the ProxyWrapper. The wrapper is responsible for rewriting requests in the format of HTTP1 non-tunneling proxy requests
• proxyTunnel now defaults to true again, so the non-tunneling becomes opt-in again (was already the case in the last update) -- however now, tests have been updated to explicitly specify the proxyTunnel value, so that it's less of a change needed when flipping the flag.

The backport to v6.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-v6.x v6.x
# Navigate to the new working tree
cd .worktrees/backport-v6.x
# Create a new branch
git switch --create backport-4340-to-v6.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 b7513d4df62e9d1c1ecc34c3a418bd402e3c8432
# Push it to GitHub
git push --set-upstream origin backport-4340-to-v6.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-v6.x

Then, create a pull request where the base branch is v6.x and the compare/head branch is backport-4340-to-v6.x.

The backport to v6.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-v6.x v6.x
# Navigate to the new working tree
cd .worktrees/backport-v6.x
# Create a new branch
git switch --create backport-4340-to-v6.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 b7513d4df62e9d1c1ecc34c3a418bd402e3c8432
# Push it to GitHub
git push --set-upstream origin backport-4340-to-v6.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-v6.x

Then, create a pull request where the base branch is v6.x and the compare/head branch is backport-4340-to-v6.x.