public function getDefaultHeaders()
    {
        return [
            'User-Agent' => 'plivo-php/' . implode('.',
                    [Version::MAJOR, Version::MINOR, Version::PATCH])
                    . ' (PHP ' . $this->phpVersion . ')',
            'Accept-Encoding' => '*',
            'Content-type' => 'application/json'
        ];
    }
public function getDefaultHeaders()
    {
        return [
            'User-Agent' => 'plivo-php/' . implode('.',
                    [Version::MAJOR, Version::MINOR, Version::PATCH])
                    . ' (PHP ' . $this->phpVersion . ')',
            'Accept-Encoding' => '*',
            'Content-type' => 'application/json'
        ];
    }
public function getDefaultHeaders ( ) { return [ 'User-Agent' => 'plivo-php/' . implode ( '.' , [ Version :: MAJOR , Version :: MINOR , Version :: PATCH ] ) . ' (PHP ' . $ this -> phpVersion . ')' , 'Accept-Encoding' => '*' , 'Content-type' => 'application/json' ] ; }
Return the default headers that every request should use.

@return array
Return the default headers that every request should use .