How to Output Custom HTTP Body Contents in CakePHP 3.4?

Outputting Custom HTTP Body Contents with CakePHP 3.4

Unlike in previous versions, CakePHP 3.4 strictly enforces the separation of data manipulation and presentation in controllers. Echoing data directly can lead to unexpected errors.

To output custom HTTP body contents, CakePHP recommends using either the PSR-7 compliant response object or serialized views.

Configuring the Response Object

PSR-7 Compliant Interface:

<code class="php">$content = json_encode(['method' => __METHOD__, 'class' => get_called_class()]);

$this->response = $this->response->withStringBody($content);
$this->response = $this->response->withType('json');

return $this->response;</code>

Deprecated Interface (CakePHP < 3.4.3):

<code class="php">$content = json_encode(['method' => __METHOD__, 'class' => get_called_class()]);

$this->response->body($content);
$this->response->type('json');

return $this->response;<h3>Using Serialized Views</h3>
<pre class="brush:php;toolbar:false"><code class="php">$content = ['method' => __METHOD__, 'class' => get_called_class()];

$this->set('content', $content);
$this->set('_serialize', 'content');</code>

This requires you to enable the request handler component and configure the router to extend parsing for JSON requests (with .json appended to URLs) or use an appropriate request with an application/json accept header.

Conclusion

Echoing data directly in controllers is discouraged in CakePHP 3.4. Instead, use the response object or serialized views to reliably output custom HTTP body contents.

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