diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60fb9e53f..23ce18779 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+# v1.7.12
+## 04/15/2021
+
+1. [](#improved)
+    * Improve JSON support for the request
+1. [](#bugfix)
+    * Fixed absolute path support for Windows [#3297](https://github.com/getgrav/grav/issues/3297)
+    * Fixed adding tags in admin after upgrading Grav [#3315](https://github.com/getgrav/grav/issues/3315)
+
 # v1.7.11
 ## 04/13/2021
 
@@ -9,7 +18,7 @@
 1. [](#improved)
     * Better GPM detection of unauthorized installations
 1. [](#bugfix)
-  * **IMPORTANT** Fixed security vulnerability with Twig allowing dangerous PHP functions by default (GHSA-g8r4-p96j-xfxc)[https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc]
+  * **IMPORTANT** Fixed security vulnerability with Twig allowing dangerous PHP functions by default [GHSA-g8r4-p96j-xfxc](https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc)
     * Fixed nxinx appending repeating `?_url=` in some redirects
     * Fixed deleting page with language code not removing the folder if it was the last language [#3305](https://github.com/getgrav/grav/issues/3305)
     * Fixed fatal error when using markdown links with `image://` stream [#3285](https://github.com/getgrav/grav/issues/3285)
diff --git a/composer.lock b/composer.lock
index 47909abbe..64e3f269f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -2135,16 +2135,16 @@
         },
         {
             "name": "rockettheme/toolbox",
-            "version": "1.5.8",
+            "version": "1.5.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/rockettheme/toolbox.git",
-                "reference": "531b2c333d024becabc67b13ae819d92708c5e5f"
+                "reference": "2d6693235aaca2efaadb61c84dac927aaf4eabfa"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/rockettheme/toolbox/zipball/531b2c333d024becabc67b13ae819d92708c5e5f",
-                "reference": "531b2c333d024becabc67b13ae819d92708c5e5f",
+                "url": "https://api.github.com/repos/rockettheme/toolbox/zipball/2d6693235aaca2efaadb61c84dac927aaf4eabfa",
+                "reference": "2d6693235aaca2efaadb61c84dac927aaf4eabfa",
                 "shasum": ""
             },
             "require": {
@@ -2185,9 +2185,9 @@
             ],
             "support": {
                 "issues": "https://github.com/rockettheme/toolbox/issues",
-                "source": "https://github.com/rockettheme/toolbox/tree/1.5.8"
+                "source": "https://github.com/rockettheme/toolbox/tree/1.5.9"
             },
-            "time": "2021-04-12T20:11:43+00:00"
+            "time": "2021-04-14T19:52:40+00:00"
         },
         {
             "name": "seld/cli-prompt",
diff --git a/system/defines.php b/system/defines.php
index 59e7d9754..af8d2a0be 100644
--- a/system/defines.php
+++ b/system/defines.php
@@ -9,7 +9,7 @@
 
 // Some standard defines
 define('GRAV', true);
-define('GRAV_VERSION', '1.7.11');
+define('GRAV_VERSION', '1.7.12');
 define('GRAV_SCHEMA', '1.7.0_2020-11-20_1');
 define('GRAV_TESTING', false);
 
@@ -68,7 +68,7 @@ unset($path);
 
 // INTERNAL: Do not use!
 define('USER_DIR', GRAV_WEBROOT . '/' . GRAV_USER_PATH . '/');
-define('CACHE_DIR', (!str_starts_with(GRAV_CACHE_PATH, '/') ? GRAV_ROOT . '/' : '') . GRAV_CACHE_PATH . '/');
+define('CACHE_DIR', (!preg_match('`^(/|[a-z]:[\\\/])`ui', GRAV_CACHE_PATH) ? GRAV_ROOT . '/' : '') . GRAV_CACHE_PATH . '/');
 
 // DEPRECATED: Do not use!
 define('CACHE_PATH', GRAV_CACHE_PATH . DS);
@@ -81,10 +81,10 @@ define('PAGES_DIR', USER_DIR . 'pages/');
 define('DATA_DIR', USER_DIR . 'data/');
 define('PLUGINS_DIR', USER_DIR . 'plugins/');
 define('THEMES_DIR', USER_DIR . 'themes/');
-define('SYSTEM_DIR', (!str_starts_with(GRAV_SYSTEM_PATH, '/') ? GRAV_ROOT . '/' : '') . GRAV_SYSTEM_PATH . '/');
+define('SYSTEM_DIR', (!preg_match('`^(/|[a-z]:[\\\/])`ui', GRAV_SYSTEM_PATH) ? GRAV_ROOT . '/' : '') . GRAV_SYSTEM_PATH . '/');
 define('LIB_DIR', SYSTEM_DIR . 'src/');
 define('VENDOR_DIR', GRAV_ROOT . '/vendor/');
-define('LOG_DIR', (!str_starts_with(GRAV_LOG_PATH, '/') ? GRAV_ROOT . '/' : '') . GRAV_LOG_PATH . '/');
+define('LOG_DIR', (!preg_match('`^(/|[a-z]:[\\\/])`ui', GRAV_LOG_PATH) ? GRAV_ROOT . '/' : '') . GRAV_LOG_PATH . '/');
 // END DEPRECATED
 
 // Some extensions
diff --git a/system/src/Grav/Common/Service/RequestServiceProvider.php b/system/src/Grav/Common/Service/RequestServiceProvider.php
index 271571351..17b3149e5 100644
--- a/system/src/Grav/Common/Service/RequestServiceProvider.php
+++ b/system/src/Grav/Common/Service/RequestServiceProvider.php
@@ -10,6 +10,7 @@
 namespace Grav\Common\Service;
 
 use Grav\Common\Uri;
+use JsonException;
 use Nyholm\Psr7\Factory\Psr17Factory;
 use Nyholm\Psr7Server\ServerRequestCreator;
 use Pimple\Container;
@@ -18,6 +19,7 @@ use function explode;
 use function fopen;
 use function function_exists;
 use function in_array;
+use function is_array;
 use function strtolower;
 use function trim;
 
@@ -51,18 +53,30 @@ class RequestServiceProvider implements ServiceProviderInterface
             $headers = function_exists('getallheaders') ? getallheaders() : $creator::getHeadersFromServer($_SERVER);
 
             $post = null;
-            if ('POST' === $method) {
+            if (in_array($method, ['POST', 'PUT', 'PATCH', 'DELETE'])) {
                 foreach ($headers as $headerName => $headerValue) {
                     if ('content-type' !== strtolower($headerName)) {
                         continue;
                     }
-                    if (in_array(
-                        strtolower(trim(explode(';', $headerValue, 2)[0])),
-                        ['application/x-www-form-urlencoded', 'multipart/form-data']
-                    )) {
-                        $post = $_POST;
 
-                        break;
+                    $contentType = strtolower(trim(explode(';', $headerValue, 2)[0]));
+                    switch ($contentType) {
+                        case 'application/x-www-form-urlencoded':
+                        case 'multipart/form-data':
+                            $post = $_POST;
+                            break 2;
+                        case 'application/json':
+                        case 'application/vnd.api+json':
+                            try {
+                                $json = file_get_contents('php://input');
+                                $post = json_decode($json, true, 512, JSON_THROW_ON_ERROR);
+                                if (!is_array($post)) {
+                                    $post = null;
+                                }
+                            } catch (JsonException $e) {
+                                $post = null;
+                            }
+                            break 2;
                     }
                 }
             }
diff --git a/system/src/Grav/Framework/Controller/Traits/ControllerResponseTrait.php b/system/src/Grav/Framework/Controller/Traits/ControllerResponseTrait.php
index bbc8f1a4f..62ed3e103 100644
--- a/system/src/Grav/Framework/Controller/Traits/ControllerResponseTrait.php
+++ b/system/src/Grav/Framework/Controller/Traits/ControllerResponseTrait.php
@@ -173,6 +173,7 @@ trait ControllerResponseTrait
             if ($method !== 'GET' && $method !== 'HEAD') {
                 $this->setMessage($message, 'error');
                 $referer = $request->getHeaderLine('Referer');
+
                 return $this->createRedirectResponse($referer, 303);
             }