.NET SDK should support environment variables http_proxy and https_proxy (as AWS CLI does)

[o7g8]

I want AWS .NET SDK to fetch proxy settings from environment variables http_proxy and https_proxy in the same way as AWS CLI does, see https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-proxy.html.

Is your Feature Request related to a problem?

I'm always frustrated that I don't get consistent behaviour of AWS toolchain in proxy handling, esp. proxies which require user/password authorization. Currently I need to specify https_proxy variable to get AWS CLI working, and then I need to craft an app.config file for every .NET application as described in https://docs.aws.amazon.com/sdk-for-net/v3/developer-guide/net-dg-config-ref.html#net-dg-config-ref-elements-proxy .
Situation gets even worse when I need to distribute my apps to other users or organizations, which need to learn the AWS-specific format of the aws section in the app.config and adjust it to their conditions. A simple and straight environment variable would solve the issue.

Here is the way I have discovered the http_proxy and https_proxy env. variables don't work with AWS .NET SDK:

• installed a Telerik Fiddler Classic on my machine
• enabled the Fiddler's rule Require Proxy Authentication (implies user=1, password=1)
• set the https_proxy=http://1:1@127.0.0.1:8888

My .NET Framework-based (not .NET Core) app didn't work (AWS .NET SDK 3.7.5.9).
When I created an app.config following https://docs.aws.amazon.com/sdk-for-net/v3/developer-guide/net-dg-config-ref.html#net-dg-config-ref-elements-proxy it did work, but I don't think the config file should be necessary.

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This is a 🚀 Feature Request

[ashishdhingra]

This needs review with the team. Also need to check on how other SDK(s) (e.g. Java) handle HTTP_PROXY and HTTPS_PROXY environment variables.

[dscpinheiro]

Today's release of AWSSDK.Core (3.7.301) includes #2991, which added support for the http_proxy and https_proxy environment variables.