Fixed issue with SimpleRouter::error not firing within group (issue: #551).

- Fixed variable incorrect variable reference in `InputItem` class.
- Added new `Router::addExceptionHandler` method.
- Added parameter types in `Url` class.
- Fixed phpdoc parameter-type for `Request::getHeader`.

src/Pecee/Http/Input/InputItem.php

@@ -97,7 +97,7 @@ class InputItem implements ArrayAccess, IInputItem, IteratorAggregate
 
     public function offsetUnset($offset): void
     {
-        unset($this->data[$offset]);
+        unset($this->value[$offset]);
     }
 
     public function __toString(): string

src/Pecee/Http/Request.php

@@ -264,12 +264,12 @@ class Request
      * Get header value by name
      *
      * @param string $name Name of the header.
-     * @param string|null $defaultValue Value to be returned if header is not found.
+     * @param string|mixed|null $defaultValue Value to be returned if header is not found.
      * @param bool $tryParse When enabled the method will try to find the header from both from client (http) and server-side variants, if the header is not found.
      *
      * @return string|null
      */
-    public function getHeader(string $name, $defaultValue = null, $tryParse = true): ?string
+    public function getHeader(string $name, $defaultValue = null, bool $tryParse = true): ?string
     {
         $name = strtolower($name);
         $header = $this->headers[$name] ?? null;

src/Pecee/Http/Url.php

@@ -431,7 +431,7 @@ class Url implements JsonSerializable
      * @param bool $includeParams
      * @return string
      */
-    public function getRelativeUrl($includeParams = true): string
+    public function getRelativeUrl(bool $includeParams = true): string
     {
         $path = $this->path ?? '/';
 
@@ -451,7 +451,7 @@ class Url implements JsonSerializable
      * @param bool $includeParams
      * @return string
      */
-    public function getAbsoluteUrl($includeParams = true): string
+    public function getAbsoluteUrl(bool $includeParams = true): string
     {
         $scheme = $this->scheme !== null ? $this->scheme . '://' : '';
         $host = $this->host ?? '';

src/Pecee/SimpleRouter/Router.php

@@ -944,4 +944,10 @@ class Router
         return $this;
     }
 
+    public function addExceptionHandler(IExceptionHandler $handler): self
+    {
+        $this->exceptionHandlers[] = $handler;
+        return $this;
+    }
+
 }

src/Pecee/SimpleRouter/SimpleRouter.php

@@ -427,9 +427,7 @@ class SimpleRouter
     {
         $callbackHandler = new CallbackExceptionHandler($callback);
 
-        static::router()->addRoute(
+        static::router()->addExceptionHandler($callbackHandler);
-            (new RouteGroup())->addExceptionHandler($callbackHandler)
-        );
 
         return $callbackHandler;
     }