fails on proxy connection but curl succeeds

[KuniyoshiKamimuraCreationline]

Summary

My server needs proxy but I can't connect with Cypress.
However, I can connect without Cypress.

How to reproduce

I ran cy:e2e with the following settings in package.json, which triggered cy.visit('/'), resulting in an error.

{
  "scripts": {
    "": "HTTP_PROXY=${HTTP_PROXY_USER}:${HTTP_PROXY_PASSWORD}@***.***.***.***:8080 && cypress open --config baseUrl=https://example.com"
  },
  ...
}

context('DBM01_01', () => {
  it('retrieve.json', () => {
    cy.visit('/');
    ...
  });
});

What I checked

I confirmed the proxy setting were correctly applied to Cypress by checking the settings screen on Cypress.

Error details

When I checked the network log, there were no requests to my server.
However Cypress log indicated that A connection to the upstream proxy could not be established, suggesting it attempted to connect to my server.

Error message

cy.visit() failed trying to load:

https://example.com/

We attempted to make an http request to this URL but the request failed without a response.

We received this error at the network level:

> Error: A connection to the upstream proxy could not be established: 20514496:error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER:....\third_party\boringssl\src\ssl\tls_record.cc:231:

But the same thing with curl succeeds

C:\test>curl -i -x %HTTP_PROXY_USER%:%HTTP_PROXY_PASSWORD%@***.***.***.***:8080 https://example.com
HTTP/1.1 200 Connection established

HTTP/1.1 302 Moved Temporarily

Accessing with Chrome without Cypress also succeeds

Accessing with Chrome with Cypress fails

When I manually opened a new tab on chrome with Cypress and entered the URL, it fails with ERR_EMPTY_RESPONSE.

Question

What does SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER mean and how can I connect to the proxy?

I've read Cypress' Proxy Configuration but haven't found the solution.

My environment

• Windows 11
• Node.js v20.17.0
• Cypress v13.15.0

Internet settings

My PC uses an auto-configuration script with proxy for my server.