Changed code example from Cept to Cest (#4259)
Changed code example from Cept to Cest (#4259)

* Changed code example from Cept to Cest

* Some changes :-)

Question:
* > One of the common issues with functional tests is the use of PHP functions that deal with headers, sessions and cookies."
    By "deal" you probably mean "modify", cause just "reading" them is no problem, right?

* Added how-to for Guzzle

* Please add a link from "You can use Guzzle to open external URL's." to this new section - I don't know how to do that :-)

Questions:

* I'm not 100% if this is the right place, but I think having this info is a good idea, see e.g. https://stackoverflow.com/questions/41546888/externalurlexception-in-laravel5-and-codeception

* In Symfony, you can use Symfony's Crawler to filter the response: `$crawler = new Crawler($response->getBody()->getContents());` Is this possible in other frameworks too?

* Update 04-FunctionalTests.md

Implementing https://github.com/Codeception/Codeception/pull/4259#discussion_r118911314

* Removed Guzzle section

See https://github.com/Codeception/Codeception/pull/4259#pullrequestreview-41927408

Naktibalda/Codeception,Naktibalda/Codeception,Codeception/Codeception,Codeception/base,Codeception/base,tasselchof/Codeception,tasselchof/Codeception,Naktibalda/Codeception,Codeception/Codeception,Codeception/base,tasselchof/Codeception