Adding README.md

README.md

@@ -0,0 +1,152 @@
+# Infor-Request-Response
+
+PHP library for HTTP request/response abstraction. Provides clean, static-style APIs for reading request parameters, building responses, and managing session flash messages.
+
+**Package:** `inforsistemas/rr`
+**Namespace:** `RR`
+**Requires:** PHP 8.1+
+
+---
+
+## Installation
+
+```bash
+composer require inforsistemas/rr
+```
+
+---
+
+## Classes
+
+### `Request` — Reading input parameters
+
+Fully static class. POST always takes precedence over GET.
+
+```php
+use RR\Request;
+use RR\ParamType;
+
+// Required param — throws Exception if missing
+$id = Request::requiredParam('id', ParamType::INT);
+
+// Optional param — returns default if missing
+$search = Request::optionalParam('q', ParamType::ALPHA, '');
+
+// Required array param — throws Exception if missing
+$items = Request::requiredParamArray('items');
+
+// Detect AJAX/fetch/API client requests
+if (Request::detectAjaxRequest()) {
+    // respond with JSON
+}
+```
+
+**`ParamType` enum values:** `INT`, `DOUBLE`, `ALPHA`, `ALPHANUM`
+
+---
+
+### `Response` — Building and sending responses
+
+Singleton accessed via `Response::getInstance()`. All builder methods are chainable and static.
+
+```php
+use RR\Response;
+
+// Send a plain HTML response
+Response::body('<h1>Hello</h1>')->send();
+
+// Append/prepend to the body buffer
+Response::bodyPrepend('<header>...</header>');
+Response::bodyAppend('<footer>...</footer>');
+Response::send();
+
+// Set a custom header
+Response::header('X-Custom', 'value')->send();
+
+// Send a JSON response
+Response::json(['status' => 'ok', 'data' => $result])->send();
+
+// JSONP response
+Response::json($data, 'myCallback')->send();
+
+// Redirect (303 by default)
+// Automatically returns JSON {"location": "..."} for AJAX requests
+Response::redirect('/dashboard');
+Response::redirect('/login', 302);
+
+// Redirect back to the previous page (HTTP_REFERER)
+Response::back();
+
+// Terminate execution after sending
+Response::send()->done();
+```
+
+---
+
+### `Flash` — Session-based flash messages
+
+Singleton accessed via `Flash::getInstance()`. Messages are written to the session and available on the **next** request.
+
+```php
+use RR\Flash;
+use RR\MessageType;
+
+// Add messages (shorthand methods)
+Flash::addInfo('Profile updated.');
+Flash::addSuccess('Order placed successfully!');
+Flash::addWarning('Your session will expire soon.');
+Flash::addError('Invalid credentials.');
+
+// Add a message with an explicit type
+Flash::addMessage('Something happened.', MessageType::INFO);
+
+// Read messages on the next request
+if (Flash::hasMessageType(MessageType::ERROR)) {
+    $errors = Flash::getError();
+}
+
+$infos    = Flash::getInfos();
+$successes = Flash::getSuccess();
+$warnings = Flash::getWarning();
+$errors   = Flash::getError();
+
+// Get all messages of any type
+$messages = Flash::getMessages(MessageType::SUCCESS);
+```
+
+**`MessageType` enum values:** `INFO`, `SUCCESS`, `WARNING`, `ERROR`
+
+---
+
+## Typical usage pattern
+
+```php
+use RR\Request;
+use RR\Response;
+use RR\Flash;
+use RR\ParamType;
+
+// Controller action
+function store(): void
+{
+    try {
+        $name  = Request::requiredParam('name', ParamType::ALPHA);
+        $price = Request::requiredParam('price', ParamType::DOUBLE);
+
+        // ... save to DB ...
+
+        Flash::addSuccess('Item created successfully.');
+        Response::redirect('/items');
+
+    } catch (\Exception $e) {
+        Flash::addError('Missing required fields.');
+        Response::back();
+    }
+}
+```
+
+---
+
+## License
+
+See [composer.json](composer.json) for author information.

src/RR/Flash.php

@@ -1,51 +1,47 @@
 <?php
+
 namespace RR;
 
+/**
+ * Class to handle flash messages.
+ * A Flash message is a message registered in this request and
+ * it's shown in the next request
+ */
 class Flash{
 
     private static $_instance;
 
-    // Message types and shortcuts
+    const FLASH_SESSION_NAME = 'flashes';
-    const FLASH_INFO    = 'i';
-    const FLASH_SUCCESS = 's';
-    const FLASH_WARNING = 'w';
-    const FLASH_ERROR   = 'e';
 
-    const FLASH_SESSION_NAME   = 'flashes';
+    public $flashes = Array();
-
+    public $nextFlashes = Array();
-    const defaultType = self::INFO;
-
-    protected $msgTypes = [
-        self::ERROR   => 'error',
-        self::WARNING => 'warning',
-        self::SUCCESS => 'success',
-        self::INFO    => 'info',
-    ];
-
-    public $oldMessages = Array();
-    public $newMessages = Array();
-    public $_flashes = Array();
 
     //SINGLETON==============================================
 
-    private function __construct(){
+    private function __construct(): void 
+    {
         if(session_id() == '' || !isset($_SESSION)) {
             session_start();
         }
-        if( isset($_SESSION['flashes']) ){
+
-            $this->oldMessages = $_SESSION['flashes'];
+        if( isset($_SESSION[self::FLASH_SESSION_NAME]) ){
+            $this->flashes = $_SESSION[self::FLASH_SESSION_NAME];
         }
-        unset( $_SESSION[self::SESSION_NAME] );
+
+        // The messages are in memory. So clear the $_SESSION
+        $_SESSION[self::FLASH_SESSION_NAME] = Array();
     }
 
-    private static function newObj(){
+    private static function newObj(): Flash
+    {
         if (!isset( self::$_instance )) {
             self::$_instance = new Flash();
         }
         return self::$_instance;
     }
 
-    public static function getInstance(){
+    public static function getInstance(): Flash
+    {
         if (!isset(self::$_instance)) {
             return self::newObj();
         }
@@ -54,103 +50,189 @@ class Flash{
 
     //=======================================================
 
-    public function merge(){
-        $this->_flashes = array_merge_recursive($this->newMessages, $this->oldMessages);
-    }
-
-    public function loadToSession(){
-        $_SESSION[self::SESSION_NAME] = $this->newMessages;
-    }
-
-    /*
-     *
-     * @ctag Flash:addMessage();
-     * @ctag Flash:addMessage(Flash::FLASH_INFO, '');
-     * @ctag Flash:addMessage(Flash::FLASH_SUCCESS, '');
-     * @ctag Flash:addMessage(Flash::FLASH_WARNING, '');
-     * @ctag Flash:addMessage(Flash::FLASH_ERROR, '');
-     *
-     */
-    public static function addMessage($type = self::defaultType, $message){
-        $instance = self::getInstance();
-        $instance->newMessages[$type] = $message;
-        $instance->loadToSession();
-    }
-    
     /**
+     * Load the stored messages for this session to the $_SESSION varible
+     * to be used on the next request
      *
-     * @ctag Flash::addInfo('');
+     * @return Flash
-     *
      */
-    public static function addInfo($message){
+    private function loadToSession(): Flash
+    {
         $instance = self::getInstance();
-        $instance->newMessages[self::INFO] = $message;
+        $_SESSION[self::FLASH_SESSION_NAME] = array_merge_recursive($_SESSION[self::FLASH_SESSION_NAME], $instance->nextFlashes);
-        $instance->loadToSession();
+        $instance->nextFlashes = Array();
+
+        return $this;
     }
 
     /**
+     * Add a message to the session with the INFO type
      *
-     * @ctag Flash::addError('');
+     * @param string $message
      *
+     * @return Flash
      */
-    public static function addError($message){
+    public static function addInfo(string $message): Flash
+    {
         $instance = self::getInstance();
-        $instance->newMessages[self::ERROR] = $message;
+        $instance->nextFlashes[MessageType::INFO->value][] = $message;
         $instance->loadToSession();
+
+        return $instance;
     }
 
     /**
+     * Add a message from a specific type on the session 
      *
-     * @ctag Flash::getErrors();
+     * @param MessageType $type
+     * @param string $message
      *
+     * @return Flash
      */
-    public static function getErrors(){
+    public static function addMessage(string $message, MessageType $type = MessageType::INFO): Flash
-        if(!self::hasErrors()){
+    {
+        $instance = self::getInstance();
+        $instance->nextFlashes[$type->value][] = $message;
+        $instance->loadToSession();
+
+        return $instance;
+    }
+
+    /**
+     * Add a message to the session with the SUCCESS type
+     *
+     * @param string $message
+     *
+     * @return Flash
+     */
+    public static function addSuccess(string $message): Flash
+    {
+        $instance = self::getInstance();
+        $instance->nextFlashes[MessageType::SUCCESS->value][] = $message;
+        $instance->loadToSession();
+
+        return $instance;
+    }
+
+    /**
+     * Add a message to the session with the WARNING type
+     *
+     * @param string $message
+     *
+     * @return Flash
+     */
+    public static function addWarning(string $message): Flash
+    {
+        $instance = self::getInstance();
+        $instance->nextFlashes[MessageType::WARNING->value][] = $message;
+        $instance->loadToSession();
+
+        return $instance;
+    }
+
+    /**
+     * Add a message to the session with the ERROR type
+     *
+     * @param string $message
+     *
+     * @return Flash
+     */
+    public static function addError(string $message): Flash
+    {
+        $instance = self::getInstance();
+        $instance->nextFlashes[MessageType::ERROR->value][] = $message;
+        $instance->loadToSession();
+
+        return $instance;
+    }
+
+    /**
+     * Check if there is messages from a type on the collection
+     *
+     * @param MessageType $type
+     *
+     * @return bool
+     */
+    public static function hasMessageType(MessageType $type = MessageType::INFO): bool
+    {
+        $instance = self::getInstance();
+
+        if(array_key_exists($type->value, $instance->flashes)){
+            return true;
+        }
+
+        return false;
+    }
+
+
+    /**
+     * Return all messages from a type
+     *
+     * @param MessageType $type
+     */
+    public static function getMessages(MessageType $type = MessageType::INFO): Array
+    {
+        if(!self::hasMessageType($type)){
             return Array();
         }
-        return self::getInstance()->_flashes[self::ERROR];
+
+        return self::getInstance()->flashes[$type->value];
     }
 
     /**
+     * Return all info messages registered on the collection
      *
-     * @ctag Flash::addInfos();
+     * @return Array
-     *
      */
-    public static function getInfos(){
+    public static function getInfos(): Array
-        if(!self::hasInfo()){
+    {
+        if(!self::hasMessageType(MessageType::INFO)){
             return Array();
         }
-        return self::getInstance()->_flashes[self::INFO];
+
+        return self::getInstance()->flashes[MessageType::INFO->value];
     }
 
     /**
+     * Return all success messages registered on the collection
      *
-     * @ctag Flash::addErrors();
+     * @return Array
-     *
      */
-    public static function hasErrors(){
+    public static function getSuccess(): Array
-        $instance = self::getInstance();
+    {
-        $instance->merge();
+        if(!self::hasMessageType(MessageType::SUCCESS)){
-        if( array_key_exists(self::ERROR, $instance->_flashes ) ){
+            return Array();
-            return true;
-        }else{
-            return false;
         }
+
+        return self::getInstance()->flashes[MessageType::SUCCESS->value];
     }
 
     /**
+     * Return all warning messages registered on the collection
      *
-     * @ctag Flash::hasInfo();
+     * @return Array
-     *
      */
-    public static function hasInfo(){
+    public static function getWarning(): Array
-        $instance = self::getInstance();
+    {
-        $instance->merge();
+        if(!self::hasMessageType(MessageType::WARNING)){
-        if( array_key_exists(self::INFO, $instance->_flashes ) ){
+            return Array();
-            return true;
-        }else{
-            return false;
         }
+
+        return self::getInstance()->flashes[MessageType::WARNING->value];
+    }
+
+    /**
+     * Return all error messages registered on the collection
+     *
+     * @return Array
+     */
+    public static function getError(): Array
+    {
+        if(!self::hasMessageType(MessageType::ERROR)){
+            return Array();
+        }
+
+        return self::getInstance()->flashes[MessageType::ERROR->value];
     }
 
 }

src/RR/MessageTypes.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace RR;
+
+enum MessageType: string 
+{
+    case INFO    = 'info';
+    case SUCCESS = 'success';
+    case WARNING = 'warning';
+    case ERROR   = 'error';
+}
+
+enum MessageTypeShort: string
+{
+    case INFO    = 'i';
+    case SUCCESS = 's';
+    case WARNING = 'w';
+    case ERROR   = 'e';
+}

src/RR/ParamType.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace RR;
+
+enum ParamType 
+{
+    case INT;      // integer
+    case DOUBLE;   // double
+    case ALPHA;    // alpha
+    case ALPHANUM; // alphanum
+}

src/RR/Request.php

@@ -2,33 +2,92 @@
 
 namespace RR;
 
-class Request{
+use RR\ParamType;
 
-    const PARAM_ALPHA = 'alpha';
+/**
-    const PARAM_ALPHANUM = 'alphanum';
+ * Class to abstract the input (GET PARAMS, POST, etc...) value grabbing
+ * POST always have precedence
+ */
+class Request
+{
 
-    const PARAM_INT = 'integer';
+    /**
-    const PARAM_DOUBLE = 'double';
+     * Search a param on the GET/POST array
-
+     * If the key is not found we throw a `required_param_not_found` Exception
-    public static function requiredParam($parname, $type, $default = '', $options = Array()){
+     *
-        // POST has precedence.
+     * @param strig $paramname
+     * @param ParamType $type
+     * @param Array $options
+     *
+     * @return mixed
+     * @throws \Exception
+     */
+    public static function requiredParam(
+        string $parname,
+        ParamType $type = ParamType::INT,
+        $options = Array()
+    ): mixed {
         if (isset($_POST[$parname])) {
             $param = $_POST[$parname];
         } else if (isset($_GET[$parname])) {
             $param = $_GET[$parname];
         } else {
-            return $default;
+            throw new \Exception('required_param_not_found');
         }
         /*$param = self::filter($type, $param);
-        
+
         foreach ($options as $key => $option){
             self::$key($param, $option);
         }*/
         return $param;
     }
 
-    public static function requiredParamArray($parname, $type, $default = '', $options = Array() ){
+    /**
-		// POST has precedence.
+     * Search a array param on the GET/POST array
+     * If the key is not found, we throw a `required_param_not_found` Exception
+     *
+     * @param strig $paramname
+     * @param ParamType $type
+     * @param Array $options
+     *
+     * @return mixed
+     * @throws \Exception
+     */
+    public static function requiredParamArray(
+        string $parname,
+        $options = Array()
+    ): mixed {
+        if (isset($_POST[$parname])) {
+            $param = $_POST[$parname];
+        } else if (isset($_GET[$parname])) {
+            $param = $_GET[$parname];
+        } else {
+            throw new \Exception('required_param_not_found');
+        }
+      	return $param;
+    }
+
+    /**
+     * Search a array param on the GET/POST array
+     * If the key is not found we return the default value
+     *
+     * If the default $value type is not the same of the $type
+     * Wwe throw a `default_value_type_missmatch` Exception
+     *
+     * @param strig $paramname
+     * @param ParamType $type
+     * @param mixed $default
+     * @param Array $options
+     *
+     * @return mixed
+     * @throws \Exception
+     */
+    public static function optionalParam(
+        string $parname,
+        ParamType $type = ParamType::INT,
+        mixed $default = "",
+        $options = Array(),
+    ): mixed {
         if (isset($_POST[$parname])) {
             $param = $_POST[$parname];
         } else if (isset($_GET[$parname])) {
@@ -39,52 +98,134 @@ class Request{
       	return $param;
     }
 
-    public static function optionalParam($parname, $type, $default = '', $options = Array()){
+    /**
-        // POST has precedence.
+     * NOT IMPLEMENTED YET
-        if (isset($_POST[$parname])) {
+     * Search a array param on the GET/POST array
-            $param = $_POST[$parname];
+     *
-        } else if (isset($_GET[$parname])) {
+     * @param strig $paramname
-            $param = $_GET[$parname];
+     * @param Array $default
-        } else {
+     * @param Array $options
-            return $default;
+     *
+     * @todo Implement
+     *
+     * @return Array
+     */
+    public static function optionalParamArray(
+        string $parname,
+        Array $default = Array(),
+        $options = Array()
+    ): Array{
+        // Not implemented yet
+        return $default;
+    }
+
+    /**
+    * Try to detect if the request came from AJAX/FETCH/POSTMAN 
+    * in this cases, we might want to return something else
+    *
+    * @return bool
+    */
+    public static function detectAjaxRequest(): bool
+    {
+        if (
+            isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&
+            strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest'
+        ) {
+            return true;
         }
-      	return $param;
+
+        if (
+            isset($_SERVER['CONTENT_TYPE']) &&
+            str_contains(
+                strtolower($_SERVER['CONTENT_TYPE']),
+                'application/json'
+            )
+        ) {
+            return true;
+        }
+
+        // Detecta ferramentas conhecidas
+        $userAgent = strtolower($_SERVER['HTTP_USER_AGENT'] ?? '');
+
+        if (
+            str_contains($userAgent, 'postman') ||
+            str_contains($userAgent, 'curl') ||
+            str_contains($userAgent, 'insomnia') ||
+            str_contains($userAgent, 'python') ||
+            str_contains($userAgent, 'java')
+        ) {
+            return true;
+        }
+
+        // Headers comuns de navegadores modernos
+        if (
+            isset($_SERVER['HTTP_SEC_FETCH_SITE']) ||
+            isset($_SERVER['HTTP_SEC_FETCH_MODE']) ||
+            isset($_SERVER['HTTP_REFERER'])
+        ) {
+            return false;
+        }
+
+        return false;
     }
 
-    public static function optionalParamArray(){
+    /**
-
+     *
-    }
+     * @param string $paramname
-
+     * @param ParamType $type
-    private static function filter($type, $paramname){
+     * @param bool $cast
+     *
+     * @todo Implement casting
+     * @todo Review this logic, I don'r remember what it does
+     *
+     * @return mixed
+    private static function filter(
+        $paramname = "", 
+        ParamType $type = ParamType::INT,
+        $cast = true
+    ): mixed {
         switch ($type){
-            case 'integer':
+            case ParamType::INT:
                 if(is_integer($paramname)){
                     return $paramname;
                 }
                 break;
-            case 'double':
+            case ParamType::DOUBLE:
                 if(is_double($paramname)){
                     return $paramname;
                 }
                 break;
-            case 'alpha':
+            case ParamType::ALPHA:
                 return $paramname;
                 break;
-            case 'alphanum':
+            case ParamType::ALPHANUM:
                 return $paramname;
                 break;
         }
     }
+    */
 
-    /*
+    /**
-     *  Validations
+     * NOT IMPLEMENTED YET
+     * Check if the numeric value is in a number range
+     *
+     * Examples:
+     * From 10 to 35 = inRange($value, "10-35") 
+     * From 45 to infinity = inRange($value, "45-") 
+     * All numbers below 0 = inRange($value, "-0") 
+     *
+     * @todo Not Implemented yet
+     *
+     * @param int|float $value
+     * @param string $range
+     *
+     * @return bool
      */
-    private static function minVal(){
+    private static function inRange(
-
+        int|float $value,
+        string $range
+    ): bool {
+        return true;
     }
 
-    private static function maxVal(){
+}
-
-    }
-
-}

src/RR/Response.php

@@ -1,42 +1,35 @@
 <?php
 namespace RR;
 
-/*
+/**
- *
+ * Class to handle the return the content/buffer and properties of a request
- *
  */
 class Response{
 
     private static $_instance;
 
-    /*
-     *
-     */
     public $_headers = Array();
 
-    /*
+    public $_body = "";
-     *
-     */
-    public $_body = Array();
 
-    /*
-     *
-     */
     public $_code = 200;
 
     //SINGLETON==============================================
 
-    private function __construct(){
+    private function __construct()
+    {
     }
 
-    private static function newObj() : Response {
+    private static function newObj() : Response
+    {
         if (!isset( self::$_instance )) {
             self::$_instance = new Response();
         }
         return self::$_instance;
     }
 
-    public static function getInstance() : Response {
+    public static function getInstance() : Response
+    {
         if (!isset(self::$_instance)) {
             return self::newObj();
         }
@@ -46,22 +39,29 @@ class Response{
     //=======================================================
 
     /**
+     * Add a parameter to what would be sent on the PHP header response
      *
-     * @ctag Response::header($key, $value);
+     * @param string $key
+     * @param string $value
      *
+     * @return Response
      */
-    public static function header($key, $value){
+    public static function header(string $key, string $value): Response
-        $istance = self::getInstance();
+    {
-        $istance->_headers[$key] = $value;
+        $instance = self::getInstance();
-        return $istance;
+        $instance->_headers[$key] = $value;
+        return $instance;
     }
 
     /**
+     * Add content before the current content buffer
      *
-     * @ctag Response::bodyPrepend($value);
+     * @param string|null $body
      *
+     * @return Response
      */
-    public static function bodyPrepend($body = null){
+    public static function bodyPrepend(string|null $body = null): Response
+    {
         $instance = self::getInstance();
         if (null !== $body) {
             $instance->_body = (string) $body . $instance->_body;
@@ -71,11 +71,14 @@ class Response{
     }
 
     /**
+     * Set or replace the body content buffer
      *
-     * @ctag Response::body($value);
+     * @param string|null $body
      *
+     * @return Response
      */
-    public static function body($body = null){
+    public static function body(string|null $body = ""): Response
+    {
         $instance = self::getInstance();
         if (null !== $body) {
             $instance->_body = (string) $body;
@@ -85,11 +88,14 @@ class Response{
     }
 
     /**
+     * Add content on the end of the body buffer
      *
-     * @ctag Response::bodyAppend($value);
+     * @param string|null $body
      *
+     * @return Response
      */
-    public static function bodyAppend($body = null){
+    public static function bodyAppend(string|null $body = null): Response
+    {
         $instance = self::getInstance();
         if (null !== $body) {
             $instance->_body .= (string) $body;
@@ -98,14 +104,26 @@ class Response{
         return $instance;
     }
 
-    private function sendHeaders(){
+    /**
+     * Send the header properties to the browser
+     *
+     * @return Response
+    */
+    private function sendHeaders(): Response
+    {
         foreach ($this->_headers as $key => $value) {
             header($key .': '. $value, true);
         }
         return $this;
     }
 
-    private function sendBody(){
+    /**
+     * Print the body buffer to the browser
+     *
+     * @return Response
+     */
+    private function sendBody(): Response
+    {
         if(!empty($this->_body)){
             echo (string) $this->_body;
         }
@@ -114,25 +132,15 @@ class Response{
     }
 
     /**
+     * Formats and print a json object/array with the adequate headers
      *
-     * @ctag Response::bodySend();
+     * @param mixed $object
+     * @param string|null $jsonPrefix
      *
+     * @return Response
      */
-    public static function send(){
+    public static function json(mixed $object = Array(), string|null $jsonPrefix = null): Response
-        $instance = self::getInstance();
+    {
-        $instance->sendHeaders();
-        $instance->sendBody();
-        http_response_code($instance->_code);
-        return $instance;
-    }
-
-    /**
-     *
-     * @ctag Response::json($object);
-     * @ctag Response::json($object, $prefix);
-     *
-     */
-    public static function json($object, $jsonPrefix = null): Response{
         $instance = self::getInstance();
 
         $instance->body('');
@@ -154,45 +162,89 @@ class Response{
     }
 
     /**
+     * Redirect the request to another URL
      *
-     * @ctag Response::redirect($url);
+     * @param string $url
-     * @ctag Response::redirect($url, $code);
+     * @param int $code
-     *
      */
-    public static function redirect($url, $code = 303){
+    public static function redirect(string $url, int $code = 303): void
+    {
         $instance = self::getInstance();
 
         $instance->_code = $code;
 
-        if(is_ajax_request()){
+        if(Request::detectAjaxRequest()){
-            return $instance->json(['location' => $url])->send();
+            $instance->json(['location' => $url])->send();
+            die;
         }
 
-        ## TODO
+        ## TODO - Try to use the header location with the class dispatch method
         header("Location: $url");
         die;
 
-        $instance->header('Location: ', $url)->send();
+        //$instance->header('Location: ', $url)->send();
-
+        //$instance->send()->done();
-        return $instance->send()->done();
 
     }
 
     /**
+     * Try to return to the previos page (HTTP_REFERER)
      *
-     * @ctag Response::back();
+     * I don't think is working, and might not make sense, return to a post endpoint with GET?
      *
+     * @param int $code
+     *
+     * @return void
      */
-    public static function back(){
+    public static function back(int $code = 303): void
+    {
         $instance = self::getInstance();
 
-        $instance->header('Location: ', $_SERVER['HTTP_REFERER']);
+        $instance->_code = $code;
+
+        if(isset($_SERVER['HTTP_REFERER'])){
+            $instance->header('Location', $_SERVER['HTTP_REFERER']);
+        } else {
+            $instance->header(
+                'Location',
+                (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] 
+                    === 'on' ? "https" : "http") . 
+                    "://" . $_SERVER['HTTP_HOST'] . 
+                    $_SERVER['REQUEST_URI']
+            );
+        }
 
         $instance->body('');
         $instance->send();
+        die;
     }
 
-    public function done(){
+    /**
+     * Send all the info stored on the object
+     *  - Send headers
+     *  - Send body
+     *  - Set response code
+     *
+     * @return Response
+     */
+    public static function send(): Response
+    {
+        $instance = self::getInstance();
+        http_response_code($instance->_code);
+        $instance->sendHeaders();
+        $instance->sendBody();
+        return $instance;
+    }
+
+    /**
+    * Kill the current execution.
+    * 
+    * After all the content is sent, there is no sense on keep the process
+    *
+    * @return void
+    */
+    public function done(): void
+    {
         die;
     }
 }