Checks that http response header is received only once.
HTTP RFC2616 allows multiple response headers with the same name.
You can check that you didn't accidentally sent the same header twice.
php
seeHttpHeaderOnce('Cache-Control');
?>>
See also:
Codeception\Module\REST::seeHttpHeaderOnce()
public function canSeeHttpHeaderOnce($name)
{
return $this->getScenario()->runStep(new \Codeception\Step\ConditionalAssertion('seeHttpHeaderOnce', func_get_args()));
}