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Showing content from https://www.yiiframework.com/doc/api/2.0/yii-filters-httpcache below:

HttpCache, yii\filters\HttpCache | API Documentation for Yii 2.0

Class yii\filters\HttpCache

HttpCache implements client-side caching by utilizing the Last-Modified and ETag HTTP headers.

It is an action filter that can be added to a controller and handles the beforeAction event.

To use HttpCache, declare it in the behaviors() method of your controller class. In the following example the filter will be applied to the index action and the Last-Modified header will contain the date of the last update to the user table in the database.

public function behaviors()
{
    return [
        [
            'class' => 'yii\filters\HttpCache',
            'only' => ['index'],
            'lastModified' => function ($action, $params) {
                $q = new \yii\db\Query();
                return $q->from('user')->max('updated_at');
            },



        ],
    ];
}

Property Details

Hide inherited properties

A value indicating whether this filter should be enabled.

The name of the cache limiter to be set when session_cache_limiter() is called. The default value is an empty string, meaning turning off automatic sending of cache headers entirely. You may set this property to be public, private, private_no_expire, and nocache. Please refer to session_cache_limiter() for detailed explanation of these values.

If this property is null, then session_cache_limiter() will not be called. As a result, PHP will send headers according to the session.cache_limiter PHP ini setting.

Method Details

Hide inherited methods

Defined in: yii\base\BaseObject::__call()

Calls the named method which is not a class method.

Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked.

                public function __call($name, $params)
{
    throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
}

Defined in: yii\base\BaseObject::__construct()

Constructor.

The default implementation does two things:

Initializes the object with the given configuration $config.
Call init().

If this method is overridden in a child class, it is recommended that

the last parameter of the constructor is a configuration array, like $config here.
call the parent implementation at the end of the constructor.

public void __construct ( $config = [] ) $config array

Name-value pairs that will be used to initialize the object properties

                public function __construct($config = [])
{
    if (!empty($config)) {
        Yii::configure($this, $config);
    }
    $this->init();
}

Defined in: yii\base\BaseObject::__get()

Returns the value of an object property.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $value = $object->property;.

See also __set().

                public function __get($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter();
    } elseif (method_exists($this, 'set' . $name)) {
        throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);
}

public boolean __isset ( $name ) $name string

The property name or the event name

return boolean

Whether the named property is set (not null).

                public function __isset($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter() !== null;
    }
    return false;
}

Defined in: yii\base\BaseObject::__set()

Sets value of an object property.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $object->property = $value;.

See also __get().

                public function __set($name, $value)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter($value);
    } elseif (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    } else {
        throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
    }
}

Defined in: yii\base\BaseObject::__unset()

Sets an object property to null.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing unset($object->property).

Note that if the property is not defined, this method will do nothing. If the property is read-only, it will throw an exception.

See also https://www.php.net/manual/en/function.unset.php.

                public function __unset($name)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter(null);
    } elseif (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Unsetting read-only property: ' . get_class($this) . '::' . $name);
    }
}

public mixed afterAction ( $action, $result ) $action yii\base\Action

The action just executed.

$result mixed

The action execution result

return mixed

The processed action result.

                public function afterAction($action, $result)
{
    return $result;
}

                public function afterFilter($event)
{
    $event->result = $this->afterAction($event->action, $event->result);
    $this->owner->off(Controller::EVENT_AFTER_ACTION, [$this, 'afterFilter']);
}

Defined in: yii\base\ActionFilter::attach()

Attaches the behavior object to the component.

The default implementation will set the $owner property and attach event handlers as declared in events(). Make sure you call the parent implementation if you override this method.

                public function attach($owner)
{
    $this->owner = $owner;
    $owner->on(Controller::EVENT_BEFORE_ACTION, [$this, 'beforeFilter']);
}

This method is invoked right before an action is to be executed (after all possible filters.) You may override this method to do last-minute preparation for the action.

                public function beforeAction($action)
{
    if (!$this->enabled) {
        return true;
    }
    $verb = Yii::$app->getRequest()->getMethod();
    if ($verb !== 'GET' && $verb !== 'HEAD' || $this->lastModified === null && $this->etagSeed === null) {
        return true;
    }
    $lastModified = $etag = null;
    if ($this->lastModified !== null) {
        $lastModified = call_user_func($this->lastModified, $action, $this->params);
    }
    if ($this->etagSeed !== null) {
        $seed = call_user_func($this->etagSeed, $action, $this->params);
        if ($seed !== null) {
            $etag = $this->generateEtag($seed);
        }
    }
    $this->sendCacheControlHeader();
    $response = Yii::$app->getResponse();
    if ($etag !== null) {
        $response->getHeaders()->set('Etag', $etag);
    }
    $cacheValid = $this->validateCache($lastModified, $etag);
    
    if ($lastModified !== null && (!$cacheValid || ($cacheValid && $etag === null))) {
        $response->getHeaders()->set('Last-Modified', gmdate('D, d M Y H:i:s', $lastModified) . ' GMT');
    }
    if ($cacheValid) {
        $response->setStatusCode(304);
        return false;
    }
    return true;
}

                public function beforeFilter($event)
{
    if (!$this->isActive($event->action)) {
        return;
    }
    $event->isValid = $this->beforeAction($event->action);
    if ($event->isValid) {
        
        
        $this->owner->on(Controller::EVENT_AFTER_ACTION, [$this, 'afterFilter'], null, false);
    } else {
        $event->handled = true;
    }
}

Defined in: yii\base\BaseObject::canGetProperty()

Returns a value indicating whether a property can be read.

A property is readable if:

the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
the class has a member variable with the specified name (when $checkVars is true);

See also canSetProperty().

                public function canGetProperty($name, $checkVars = true)
{
    return method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name);
}

Defined in: yii\base\BaseObject::canSetProperty()

Returns a value indicating whether a property can be set.

A property is writable if:

the class has a setter method associated with the specified name (in this case, property name is case-insensitive);
the class has a member variable with the specified name (when $checkVars is true);

See also canGetProperty().

public boolean canSetProperty ( $name, $checkVars = true ) $name string

The property name

$checkVars boolean

Whether to treat member variables as properties

return boolean

Whether the property can be written

                public function canSetProperty($name, $checkVars = true)
{
    return method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name);
}

Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

                public static function className()
{
    return get_called_class();
}

Defined in: yii\base\ActionFilter::detach()

Detaches the behavior object from the component.

The default implementation will unset the $owner property and detach event handlers declared in events(). Make sure you call the parent implementation if you override this method.

                public function detach()
{
    if ($this->owner) {
        $this->owner->off(Controller::EVENT_BEFORE_ACTION, [$this, 'beforeFilter']);
        $this->owner->off(Controller::EVENT_AFTER_ACTION, [$this, 'afterFilter']);
        $this->owner = null;
    }
}

Defined in: yii\base\Behavior::events()

Declares event handlers for the $owner's events.

Child classes may override this method to declare what PHP callbacks should be attached to the events of the $owner component.

The callbacks will be attached to the $owner's events when the behavior is attached to the owner; and they will be detached from the events when the behavior is detached from the component.

The callbacks can be any of the following:

method in this behavior: 'handleClick', equivalent to [$this, 'handleClick']
object method: [$object, 'handleClick']
static method: ['Page', 'handleClick']
anonymous function: function ($event) { ... }

The following is an example:

[
    Model::EVENT_BEFORE_VALIDATE => 'myBeforeValidate',
    Model::EVENT_AFTER_VALIDATE => 'myAfterValidate',
]

public array events ( ) return array

Events (array keys) and the corresponding event handler methods (array values).

                public function events()
{
    return [];
}

Generates an ETag from the given seed string.

                protected function generateEtag($seed)
{
    $etag = '"' . rtrim(base64_encode(sha1($seed, true)), '=') . '"';
    return $this->weakEtag ? 'W/' . $etag : $etag;
}

                protected function getActionId($action)
{
    if ($this->owner instanceof Module) {
        $mid = $this->owner->getUniqueId();
        $id = $action->getUniqueId();
        if ($mid !== '' && strpos($id, $mid) === 0) {
            $id = substr($id, strlen($mid) + 1);
        }
    } else {
        $id = $action->id;
    }
    return $id;
}

Defined in: yii\base\BaseObject::hasMethod()

Returns a value indicating whether a method is defined.

The default implementation is a call to php function method_exists(). You may override this method when you implemented the php magic method __call().

                public function hasMethod($name)
{
    return method_exists($this, $name);
}

Defined in: yii\base\BaseObject::hasProperty()

Returns a value indicating whether a property is defined.

A property is defined if:

the class has a getter or setter method associated with the specified name (in this case, property name is case-insensitive);
the class has a member variable with the specified name (when $checkVars is true);

See also:

public boolean hasProperty ( $name, $checkVars = true ) $name string

The property name

$checkVars boolean

Whether to treat member variables as properties

return boolean

Whether the property is defined

                public function hasProperty($name, $checkVars = true)
{
    return $this->canGetProperty($name, $checkVars) || $this->canSetProperty($name, false);
}

Defined in: yii\base\BaseObject::init()

Initializes the object.

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

                public function init()
{
}

                protected function isActive($action)
{
    $id = $this->getActionId($action);
    if (empty($this->only)) {
        $onlyMatch = true;
    } else {
        $onlyMatch = false;
        foreach ($this->only as $pattern) {
            if (StringHelper::matchWildcard($pattern, $id)) {
                $onlyMatch = true;
                break;
            }
        }
    }
    $exceptMatch = false;
    foreach ($this->except as $pattern) {
        if (StringHelper::matchWildcard($pattern, $id)) {
            $exceptMatch = true;
            break;
        }
    }
    return !$exceptMatch && $onlyMatch;
}

Validates if the HTTP cache contains valid content.

If both Last-Modified and ETag are null, returns false.

protected boolean validateCache ( $lastModified, $etag ) $lastModified integer|null

The calculated Last-Modified value in terms of a UNIX timestamp. If null, the Last-Modified header will not be validated.

$etag string|null

The calculated ETag value. If null, the ETag header will not be validated.

return boolean

Whether the HTTP cache is still valid.

                protected function validateCache($lastModified, $etag)
{
    if (Yii::$app->request->headers->has('If-None-Match')) {
        
        
        return $etag !== null && in_array($etag, Yii::$app->request->getETags(), true);
    } elseif (Yii::$app->request->headers->has('If-Modified-Since')) {
        return $lastModified !== null && @strtotime(Yii::$app->request->headers->get('If-Modified-Since')) >= $lastModified;
    }
    return false;
}

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