Unable to execute openapi-generator-cli version[BUG]

Using version 2.3.5 of openapi-generator-cli in the Node environment, I am getting the error shown below. Googling, I found bug #130 in this issue database. This issue states that a solution was put in place, but does not provide any guidance on how to implement the solution.

[rflatau@localhost server]$ npx @openapitools/openapi-generator-cli version
Unable to query repository, because of: "Request failed with status code 501"

Response:
server squid/3.4.8
mime-version 1.0
date Tue, 22 Jun 2021 13:39:33 GMT
content-type text/html
content-length 3484
x-squid-error ERR_UNSUP_REQ 0
vary Accept-Language
content-language en
x-cache MISS from intergate2
x-cache-lookup NONE from intergate2:3132
via 1.1 intergate2 (squid/3.4.8)
connection close

(node:35812) UnhandledPromiseRejectionWarning: TypeError: error.response.data.on is not a function
    at VersionManagerService.printResponseError (/home/rflatau/devel/learning_center-main/api/node_modules/@openapitools/openapi-generator-cli/main.js:922:33)
    at /home/rflatau/devel/learning_center-main/api/node_modules/@openapitools/openapi-generator-cli/main.js:828:18
    at /home/rflatau/devel/learning_center-main/api/node_modules/rxjs/dist/cjs/internal/operators/catchError.js:13:46
    at OperatorSubscriber._this._error (/home/rflatau/devel/learning_center-main/api/node_modules/rxjs/dist/cjs/internal/operators/OperatorSubscriber.js:38:21)
    at OperatorSubscriber.Subscriber.error (/home/rflatau/devel/learning_center-main/api/node_modules/rxjs/dist/cjs/internal/Subscriber.js:80:18)
    at OperatorSubscriber.Subscriber._error (/home/rflatau/devel/learning_center-main/api/node_modules/rxjs/dist/cjs/internal/Subscriber.js:104:30)
    at OperatorSubscriber.Subscriber.error (/home/rflatau/devel/learning_center-main/api/node_modules/rxjs/dist/cjs/internal/Subscriber.js:80:18)
    at OperatorSubscriber.Subscriber._error (/home/rflatau/devel/learning_center-main/api/node_modules/rxjs/dist/cjs/internal/Subscriber.js:104:30)
    at OperatorSubscriber.Subscriber.error (/home/rflatau/devel/learning_center-main/api/node_modules/rxjs/dist/cjs/internal/Subscriber.js:80:18)
    at OperatorSubscriber.Subscriber._error (/home/rflatau/devel/learning_center-main/api/node_modules/rxjs/dist/cjs/internal/Subscriber.js:104:30)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:35812) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)
(node:35812) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

The referenced bug report seems to imply that proxy settings might be the problem. Investigating now how to deal with specifying the proxies. We are behind a corporate proxy. I have tried setting http_proxy and https_proxy environment parameters without success. I believe that there is a way to configure the openapi-generator-cli to deal with proxies, but I have not been able to find this.

I found two configurations within the referenced bug report: here and here. But no details on the structure of the configuration file.

What is the configuration needed to get the command below work? How do I augment the command to use the configuration file:

npx @openapitools/openapi-generator-cli version