[REQ] Add proxy support via environment variables

[apyrgio]

Is your feature request related to a problem? Please describe.

Most programs detect that they must use a proxy by checking the http_proxy / https_proxy environment variables. See for example this section of requests on proxying: https://github.com/request/request#controlling-proxy-behaviour-using-environment-variables.

This is not the case here though, as the user must explicitly override the .proxy argument of the Configuration class, in order to enable proxying.

Describe the solution you'd like

The Configuration class should auto-detect the appropriate environment variables and pass them to urllib3, given that urllib3 has chosen not to do it (urllib3/urllib3#1785). If this proposal makes sense, I could open a PR.

(This issue was originally opened in kubernetes-client/python#1175)

[zeraphin21]

Agree with that, I figured out the same problem and was forced to override the proxy attribute.
We should have the possibility to set proxy when init Configuration class.

[JohannesHoppe]

As a workaround, you can can try setting the networking properties using -D: https://docs.oracle.com/javase/7/docs/api/java/net/doc-files/net-properties.html

e.g.

java -Dhttps.proxyHost=internal-proxy.mycompany.com -Dhttps.proxyPort=8080 -jar openapi-generator.jar generate -i https://api.mycompany.com/swagger.json -g typescript-angular -o ./api

The -D arguments must be placed before the -jar option!

[AlissonLorscheiterTR]

same problem with python3 using uvicorn project, calling requests method with urllib3 dependencies.