It looks good to me testing with the above [Test Case].

# apt-get update
Hit:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
==> Hit:2 https://packages.microsoft.com/repos/azure-cli bionic InRelease       
Hit:3 http://archive.ubuntu.com/ubuntu bionic InRelease                         
Hit:4 http://archive.ubuntu.com/ubuntu bionic-updates InRelease                
Hit:5 http://archive.ubuntu.com/ubuntu bionic-backports InRelease               
Hit:6 http://archive.ubuntu.com/ubuntu bionic-proposed InRelease                
Reading package lists... Done

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Touch seeded packages, which is subscribed to apt in Ubuntu.

  http:Fix Host header in proxied https connections

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Bionic:
  Fix Committed
Status in apt source package in Disco:
  Fix Committed

Bug description:

  Currently CONNECT requests use the name of the proxy as Host value,
  instead of the origin server's name.

  According to RFC 2616 "The Host field value MUST represent the naming
  authority of the origin server or gateway given by the original URL."

  The current implementation causes problems with some proxy vendors. This
  commit[0] fixes this.

  [0] - https://salsa.debian.org/apt-

  [Test Case]

  Here's one reproducer an impacted user brought to my attention:

  # /etc/environment

  To support application development activities in-house, I had to
  configure Azure CLI APT repository following the instructions from

  $ sudo apt-get update
  $ sudo apt-get install curl apt-transport-https lsb-release gnupg
  $ curl -sL https://packages.microsoft.com/keys/microsoft.asc | \
  $ gpg --dearmor | \
  $ sudo tee /etc/apt/trusted.gpg.d/microsoft.asc.gpg > /dev/null
  $ AZ_REPO=$(lsb_release -cs)
  $ echo "deb [arch=amd64] https://packages.microsoft.com/repos/azure-cli/ $ $ 
AZ_REPO main" | \
  $ sudo tee /etc/apt/sources.list.d/azure-cli.list
  $ sudo apt update

  In the final "apt update" command, APT respects system-wide network
  proxy variables and successfully fetched Canonical repository data
  over HTTP.

  However, it was unable to fetch the newly added Microsoft packages
  repository served via HTTPS.

  By using Wireshark to examine the HTTPS request made by APT, the
  request body reveals as:

  CONNECT packages.microsoft.com:443 HTTP/1.1\r\n
  Host: internal:8080\r\n
  User-Agent: Debian APT-HTTP/1.3 (1.6.11)\r\n

  There also is an automated test case in the package that runs as part
  of autopkgtest that tests a scenario like this, see the commit.

  [Regression Potential]

  * Fix already in debian, and Eoan
  * Has been reviewed/approved by juliank
  * A test package (pre-sru) has been provided to an impacted user, and he 
confirms it solves the situation.

  [Other Info]

  # salsa
  $ git describe --contains 86d4d98060f36c7e71c34af20a1193a75496ef72

  # rmadison apt
  => apt | 1.6.11 | bionic-updates | source, amd64, arm64, armhf, i386, 
ppc64el, s390x
  => apt | 1.8.1 | disco-updates | source, amd64, arm64, armhf, i386, ppc64el, 
  apt | 1.9.1 | eoan | source, amd64, arm64, armhf, i386, ppc64el, s390x

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