Retry certain requests on failure

[flotwig]

Closes #4013
Closes #898
Closes #1013
Closes #4232

• Retry cy.visit(), cy.request(), and all requests that go through Cypress under the hood
  • If options.retryOnNetworkFailure is true (default) or it's a Cypress proxy request, ECONNREFUSED, ECONNRESET, EPIPE, EHOSTUNREACH, and EAI_AGAIN errors will be retried
  • If options.retryOnStatusCodeFailure is true, requests will be retried on non-successful status codes
  • Retries will happen 4 times at increasing intervals: 0s, 1s, 2s, 2s
  • ECONNREFUSED retries and proxied retries happen at shorter intervals: 0s, 100ms, 200ms, 200ms
  • Proxied request bodies will be buffered in memory as they are streamed in so that we can re-send them in the event of a network error
• Set { timeout: null } on proxied requests so the only timeout is the eventual OS timeout, since Chrome won't timeout
• Retry https-proxy connections in proxied mode and in direct mode using same rules
• Retry the baseUrl check in run mode at 0s, 1s, 2s, 2s intervals, then fail if it is unsuccessful
• Update documentation: Document changes to network retries cypress-documentation#1648

[flotwig]

New baseurl check output in run mode:

Cypress could not verify that the server set as your `baseUrl` is running: http://never-gonna-exist.invalid

Your tests likely make requests to this `baseUrl` and these tests will fail if you don't boot your server.

We will retry 3 more times in 1 second...

Cypress could not verify that the server set as your `baseUrl` is running: http://never-gonna-exist.invalid

Your tests likely make requests to this `baseUrl` and these tests will fail if you don't boot your server.

We will retry 2 more times in 2 seconds...

Cypress could not verify that the server set as your `baseUrl` is running: http://never-gonna-exist.invalid

Your tests likely make requests to this `baseUrl` and these tests will fail if you don't boot your server.

We will retry 1 more time in 2 seconds...
Cypress could not verify that the server set as your `baseUrl` is running:

  > http://never-gonna-exist.invalid

Your tests likely make requests to this `baseUrl` and these tests will fail if you don't boot your server.

Please start this server and then run Cypress again.

[brian-mann]

• didn't get a chance to clean up some of the retrying proxy stuff in the packages/agent but otherwise LGTM!

[YOU54F]

Hey @flotwig / @brian-mann , I just pulled this commit into my fork whilst testing microsoft edge and I can't load any browsers now in gui or cli mode, I get the error in the terminal output below.

Just removed pulling master into my fork (this pr and it has resolved it for all browsers, just a friendly fyi 👍

I am running a mbp 2018 with mojave 10.14.4

➜  cypress git:(feat/msEdge) ✗ npm run start
Alias tip: npmR start

> [email protected] prestart /Users/you54f/dev/saftest/githubrepos/forks/cypress
> npm run check-deps-pre


> [email protected] check-deps-pre /Users/you54f/dev/saftest/githubrepos/forks/cypress
> node ./scripts/check-deps.js --verbose --prescript


> [email protected] start /Users/you54f/dev/saftest/githubrepos/forks/cypress
> node ./cli/bin/cypress open --dev --global

GET /__/ 200 23.792 ms - -
TypeError: connect.createRetryingSocket is not a function
    at Server._makeConnection (/Users/you54f/dev/saftest/githubrepos/forks/cypress/packages/https-proxy/lib/server.coffee:144:20)
    at Server._makeDirectConnection (/Users/you54f/dev/saftest/githubrepos/forks/cypress/packages/https-proxy/lib/server.coffee:103:6)
    at Server._onFirstHeadBytes (/Users/you54f/dev/saftest/githubrepos/forks/cypress/packages/https-proxy/lib/server.coffee:71:17)
    at Socket.<anonymous> (/Users/you54f/dev/saftest/githubrepos/forks/cypress/packages/https-proxy/lib/server.coffee:62:8)
    at Object.onceWrapper (events.js:315:30)
    at emitOne (events.js:116:13)
    at Socket.emit (events.js:211:7)
    at addChunk (_stream_readable.js:263:12)
    at readableAddChunk (_stream_readable.js:250:11)
    at Socket.Readable.push (_stream_readable.js:208:10)
    at TCP.onread (net.js:594:20)

[flotwig]

@YOU54F try deleting all of the .js files from packages/network/lib, you have an old version of a TS file transpiled

[YOU54F]

Spot on @flotwig , sorted it, thank you for that!