Problem description

When using a grpc_proxy with @grpc/grpc-js@1.13.0, connections to vision.googleapis.com fail to establish. No issue with @grpc/grpc-js@1.12.6.

Reproduction steps

create a grpc request to vision.googleapis.com over squid proxy (6.x).

$> npm install @google-cloud/vision

import {ImageAnnotatorClient} from '@google-cloud/vision';
import {readFile} from 'fs/promises';

process.env.GOOGLE_APPLICATION_CREDENTIALS = './credentials.json';
process.env.grpc_proxy = "http://proxy:port";

const visionClient = new ImageAnnotatorClient();
const imageBuffer = await readFile('./image.jpg');

const [response] = await visionClient.textDetection({image: {content: imageBuffer.toString('base64')}});
console.log(response);

By default @grpc/grpc-js@1.13.1 is installed as a dependency. The code above will loop for 10 minutes making connection attempts to the proxy service.

$> npm i @grpc/grpc-js@1.12.6
Downgrading to 1.12.6 allows the connection over proxy to succeed as expected.

Environment

• MacOS 15.3/Alpine Linux 3.20
• 20/22
• node:alpine-20 image, homebrew.
• @grpc/grpc-js@1.13.0

Additional context

Looks like a workaround for TLS proxying over http proxy was removed between 1.12.6 and 1.13.0, perhaps related? #1369