Problems hitting requests in localhost

[jmcanache]

Current behavior:

I have a backend application running locally with xampp, this application have some API endpoints and the host of the application is http://testapi.localhost

For other side I have a html+js app runing with webpack-dev-server and runs in http://localhost:3000 , when this app load for the first time it makes a request to the API, something like "GET - http://testapi.localhost/user/1". This request is inside the javascrtip app code, is not inside in the Cypress test code.

Now this is the problem, outside Cypress the app works perfectly in any browser, the request is made succesfully but inside Cypress the request fail with the next error message: "net::ERR_EMPTY_RESPONSE"

I found some sort of "solution" but its not perfect, setting the variable HTTP_PROXY = localhost the app works inside Cypress but sometimes I receive this error in the console: "MaxListenersExceededWarning: Possible EventEmitter memory leak detected" and Cypress close.

Desired behavior:

Make a succesfully request locally that is not in the Cypress test but in the Application code

Versions

Cypress: 3.7.0
system: Windows 10
Browser: Chrome 78, Canary 80

[jmcanache]

After I change the end point of my API from http://testapi.localhost to http://testapi.anything the request started working properly. The word "localhost" was the problem, I don't know why

[obedparla]

Having the same issue, my mock servers work but Cypress gets an empty response in Cypress

[flotwig]

Having the same issue, my mock servers work but Cypress gets an empty response in Cypress

Are you also requesting a subdomain of localhost like http://foo.localhost?

[obedparla]

No, in my case I'm trying to hit localhost:10008 directly. This is the exact command in my package.json:

"cypress": "./node_modules/.bin/cypress run --config baseUrl=http://localhost:10008",

[WouterSioen]

For me it worked by hosting the API I was fetching locally on 0.0.0.0:8080 instead of on localhost:8080

[obedparla]

That's an interesting idea @WouterSioen

[JacobCrofts]

@WouterSioen that worked for me as well. My setup is very similar to OP's:

• Ruby on Rails application hosted on localhost:3000 that serves JavaScript via webpack
• Sinatra API hosted on localhost:9070 that hosts most API endpoints

The JS browser client makes AJAX requests to localhost:9070:

const makeRequestToSinatra = (path, method, data) => {
  $.ajax({
    url: `http://localhost:9070/api/v1${path}`,
    type: method,
    data: JSON.stringify(data),
    headers: {
      "X-Requested-With": "XMLHttpRequest",
      "Content-Type": "application/json",
      Accept: "application/json",
    },

    // and so on
  });
};

Simply switching my Sinatra app to be hosted on 0.0.0.0 allowed Cypress to interact with the Sinatra API. I did not need to change anything else about my environment and applications:

# code specific to Sinatra http://sinatrarb.com/configuration.html#bind---server-hostname-or-ip-address
set :bind, '0.0.0.0' if cypress_environment?

[aeneasr]

We are encountering this issue as well, the URL http://local.oryapis.localhost:8080/ works but cy.request to http://pensive-diffie-cptl5ycy7k.projects.local.oryapis.localhost:8080/api/kratos/admin/health/alive fail within the cypress chrome window, but do not fail in the normal Chrome.

Tried the recommended approaches for HTTP_PROXY=localhost and also looked into NO_PROXY (which does not support wildcards?) without effect.

[aeneasr]

My bad, in fact, Google Chrome properly resolve the host, even if it is not explicitly set in /etc/hosts, but Safari, curl - and Cypress Chrome - do not resolve that host. Is there an option to enable in Cypress the same behaviour as in Google Chrome?

[PhatNguyen213]

My bad, in fact, Google Chrome properly resolve the host, even if it is not explicitly set in /etc/hosts, but Safari, curl - and Cypress Chrome - do not resolve that host. Is there an option to enable in Cypress the same behaviour as in Google Chrome?

Did you find any solutions?

[Klausmd5]

Interesting enough, I have the exact same error, but my API is running on AWS.
Are there any workarounds?

[qortex]

Hit the same here, puma server is hosted on 0.0.0.0:9292. Hitting localhost:9292 when run in cypress does not work ECONNREFUSED (although it works usually in chrome). Switching to hit exactly 0.0.0.0:9292 fixes the issue and the requests work ok.

[cypress-app-bot]

This issue has not had any activity in 180 days. Cypress evolves quickly and the reported behavior should be tested on the latest version of Cypress to verify the behavior is still occurring. It will be closed in 14 days if no updates are provided.