web\Response $format

The response format. This determines how to convert $data into $content when the latter is not set. The value of this property must be one of the keys declared in the $formatters array. By default, the following formats are supported:

• FORMAT_RAW: the data will be treated as the response content without any conversion. No extra HTTP header will be added.
• FORMAT_HTML: the data will be treated as the response content without any conversion. The "Content-Type" header will set as "text/html".
• FORMAT_JSON: the data will be converted into JSON format, and the "Content-Type" header will be set as "application/json".
• FORMAT_JSONP: the data will be converted into JSONP format, and the "Content-Type" header will be set as "text/javascript". Note that in this case $data must be an array with "data" and "callback" elements. The former refers to the actual data to be sent, while the latter refers to the name of the JavaScript callback.
• FORMAT_XML: the data will be converted into XML format. Please refer to yii\web\XmlResponseFormatter for more details.

You may customize the formatting process or support additional formats by configuring $formatters.

See also $formatters.