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fix: Usage of header function
The header function of PHP have only an argument to define the header name and value. This argument need to be a string.
More info: https://www.php.net/header
chore: remove sleep
Removed to test go more fast. Is very strange to have a sleep here and removing the tests worked fine.
fix: type of return
The method getBody can't return null. The return of this method need to be a instance of StreamInterface. To fix this I create a instance of a class that extends StreamInterface.
Reference: https://github.com/php-fig/http-message/blob/1.0/src/MessageInterface.php#L169-L171