Support Package fails to download if proxy is in use

After successfully testing the HelloWorld application using briefcase dev I attempted to move on to tutorial 3 and got the following error: Using support package https://briefcase-support.org/python?platform=windows&version=3.6&arch=amd64 Unable to downloading support package; is your computer offline?

I am behind a Proxy but I configured the git config --global http.proxy and https.proxy using the same proxy configurations I use for pip behind the proxy but it still resulted in the same error. Please advise.

[freakboy3742]

Thanks for the report!

In this case, the problem isn’t with git or pip (Briefcase does use those two services as well); it’s with the https://briefcase-support.org website that hosts our pre-build Python support packages. In your particular case, the URL that is listed will be redirecting to download https://www.python.org/ftp/python/3.6.8/python-3.6.8-embed-amd64.zip

We don’t currently have any proxy support baked in for accessing that service - it sounds like we may need to add support for proxies.

To help us work out what is required: What configuration would you need in briefcase to allow:

curl -L "https://briefcase-support.org/python?platform=windows&version=3.6&arch=amd64" -o python-3.6.8-embed-amd64.zip

to successfully download the ZIP file?

As a workaround; if you can manually download that file, you can add support_package = 'path\to\python-3.6.8-embed-amd64.zip' to the MSI section of your pyproject.toml - that will circumvent Briefcase’s attempt to download the support package and use the local version.

[CJRobey]

Just as a note for anyone who may be having the following issue when building for linux behind a proxy:

Sending build context to Docker daemon  527.4kB
Step 1/17 : FROM ubuntu:18.04
 ---> 329ed837d508
Step 2/17 : WORKDIR /app
 ---> Using cache
 ---> 5f258402fbb4
Step 3/17 : ARG PY_VERSION
 ---> Using cache
 ---> a743e1568346
Step 4/17 : ARG SYSTEM_REQUIRES
 ---> Using cache
 ---> b63e3081971c
Step 5/17 : ENV DEBIAN_FRONTEND="noninteractive"
 ---> Using cache
 ---> f28a77e17016
Step 6/17 : RUN apt-get update -y &&     apt-get install -y         software-properties-common         dirmngr         apt-transport-https         lsb-release         ca-certificates
 ---> Running in 3d0852eca36e
Err:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
  Could not connect to webproxy.ext.ti.com:80 (23.202.231.168), connection timed out Could not connect to webproxy.ext.ti.com:80 (23.217.138.109), connection timed out
Err:2 http://archive.ubuntu.com/ubuntu bionic InRelease
  Could not connect to webproxy.ext.ti.com:80 (23.202.231.168), connection timed out Could not connect to webproxy.ext.ti.com:80 (23.217.138.109), connection timed out
Err:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
  Unable to connect to webproxy.ext.ti.com:80:
Err:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
  Unable to connect to webproxy.ext.ti.com:80:
Reading package lists...
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease  Could not connect to webproxy.ext.ti.com:80 (23.202.231.168), connection timed out Could not connect to webproxy.ext.ti.com:80 (23.217.138.109), connection timed out
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Unable to connect to webproxy.ext.ti.com:80:
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  Unable to connect to webproxy.ext.ti.com:80:
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease  Could not connect to webproxy.ext.ti.com:80 (23.202.231.168), connection timed out Could not connect to webproxy.ext.ti.com:80 (23.217.138.109), connection timed out
W: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists...
Building dependency tree...
Reading state information...
Package ca-certificates is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Unable to locate package software-properties-common
E: Unable to locate package dirmngr
E: Unable to locate package lsb-release
E: Package 'ca-certificates' has no installation candidate
The command '/bin/sh -c apt-get update -y &&     apt-get install -y         software-properties-common         dirmngr         apt-transport-https         lsb-release         ca-certificates' returned a non-zero code: 100

Error building Docker container for batchccm.

This is a docker proxy issue that can be solved here: https://docs.docker.com/config/daemon/systemd/