Use http_proxy enviroment variable for ProxyConfiguration

[Jakob-em]

Describe the Feature

The ProxyConfiguration should take the values from the http_proxy/https_proxy environment variables. As seen here: aws/aws-sdk-java#1959

Is your Feature Request related to a problem?

I was running into some issues when using a proxy for the connection to s3 and then realised that the system http_proxy was not used for the connection.

• I may be able to implement this feature request

[debora-ito]

Thank you for reaching out @Jakob-em. This is a reasonable ask, since it's supported in V1.

[mjeffrey]

We just had the same issue for KMS (we use "https" rather than "http")

-Dhttps.proxyHost and -Dhttps.proxyPort

The problem appears to be in the ProxyConfiguration.resolvePort() and ProxySystemSetting.

If both https.proxy* and http.proxy* are set then you should prefer the https values (I assume all calls are https 😃 ).

A workaround is to set the http.proxy* properties as well.

I'm willing to make a PR if you agree with what I wrote above.

[github-actions]

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