Support Network.setCacheDisabled command for Firefox

[shwarcu]

What would you like?

I googled a bit and it looks like that Firefox should also support following workaround for cached requests

  Cypress.automation('remote:debugger:protocol', {
    command: 'Network.enable',
    params: {},
  });
  Cypress.automation('remote:debugger:protocol', {
    command: 'Network.setCacheDisabled',
    params: { cacheDisabled: true },
  });

Mozilla documentation https://wiki.mozilla.org/WebDriver/RemoteProtocol
provides a list of supported commands
https://docs.google.com/spreadsheets/d/e/2PACX-1vRqKh563C0b0pnJruf85REpviTERnEoNEITEH3v9RvSCpkLzu9vw8c8_PAIgJoUpnUviVHV93u4V8V_/pubhtml?gid=108099026&single=true
and Network.setCacheDisabled is listed there as supported (experimental).
You can also find commits that added support for this command in the Firefox.

However when trying to run above workaround on Firefox, we get such error

Event:      uncaught exception [index.347a0a6e.js:98212:13](https://127.0.0.1:8080/__/assets/index.347a0a6e.js)
Caught by:  "unhandledrejection" handler [index.347a0a6e.js:98212:13](https://127.0.0.1:8080/__/assets/index.347a0a6e.js)
Error:      Error: No handler registered for: 'remote:debugger:protocol'
     automation cypress_runner.js:163965
     ./cypress/support/e2e.ts e2e.ts:35
    Webpack 15

Issue related to #14459

Why is this needed?

Cypress does not provide a solution for not-working cy.intercept when request is cached by a Browser,
We are forced to use workaround from issue #14459.
But Cypress did not implement handler (?) for this remote debugger protocol command for Firefox. So we can't use that workaround when running tests on Firefox

Other

No response

[flotwig]

Related: #7942

For now, the automation.use invocation in firefox-util.ts can be updated to pass remote:debugger:protocol commands to the FF CDP client, since we already connect to it.

[shwarcu]

I will take a look and try to contribute if I don't leave my place for the weekend

[Havrin]

just noticed this error in our tests only in firefox. +1 to fix it!

[MDG-JHowley]

Can possibly be resolved with user prefs e.g.

// in Cypress config, `setupNodeEvents`
on('before:browser:launch', (browser, launchOptions) => {
    if (browser.family === 'firefox') {
      launchOptions.preferences['browser.cache.disk.enable'] = false;
      launchOptions.preferences['browser.cache.memory.enable'] = false;

      return launchOptions;
    }
  });