'Failed to fetch' error when calling fetch in `cypress run`

Current behavior:

Getting Failed to fetch error when running cypress run and visiting a website in https. I’m not getting this error when running in cypress open and also not when running in http websites.

Desired behavior:

Not to get this error.

Steps to reproduce:

I made one commit to demonstrate the problem in the following fork and branch: https://github.com/amitzur/cypress-test-tiny/tree/fetch_issue

I’m calling fetch inside a custom command to a local webserver launched in a cypress plugin.

Versions

This happens on both Cypress version 2.1.0 and 3.0.1

[jennifer-shehane]

Honestly, I’m not sure about where the difference originates. I believe you should be able to set chromeWebSecurity to false in your cypress.json if you want to ignore this error in your tests though.

{
  "chromeWebSecurity": false
}

[VigneshTrantor]

Why was this closed? It doesn’t seem like the original bug was fixed. I’m experiencing this issue as well and would like to avoid disabling chromeWebSecurity if possible.

Have you managed to solve it ? I am facing the same problem too