exception: Use built-in HTTP response codes

PHP >= 5.4 provides a built-in function to generate valid HTTP
error header including the error description: http_response_code()

See: http://php.net/manual/en/function.http-response-code.php
See also: https://stackoverflow.com/a/12018482

This commit removes the '\Http' utility class and replaces all
calls to 'Http::getMessageForCode()' by 'http_response_code()'

bridges/FacebookBridge.php

@@ -155,7 +155,7 @@ class FacebookBridge extends BridgeAbstract {
 
 			//Show captcha filling form to the viewer, proxying the captcha image
 			$img = base64_encode(getContents($captcha->find('img', 0)->src));
-			header('HTTP/1.1 500 ' . Http::getMessageForCode(500));
+			http_response_code(500);
 			header('Content-Type: text/html');
 			$message = <<<EOD
 <form method="post" action="?{$_SERVER['QUERY_STRING']}">

index.php

@@ -174,7 +174,7 @@ try {
 			$bridge->setCache($cache);
 			$bridge->setDatas($params);
 		} catch(Exception $e) {
-			header('HTTP/1.1 ' . $e->getCode() . ' ' . Http::getMessageForCode($e->getCode()));
+			http_response_code($e->getCode());
 			header('Content-Type: text/html');
 			die(buildBridgeException($e, $bridge));
 		}
@@ -186,7 +186,7 @@ try {
 			$format->setExtraInfos($bridge->getExtraInfos());
 			$format->display();
 		} catch(Exception $e) {
-			header('HTTP/1.1 ' . $e->getCode() . ' ' . Http::getMessageForCode($e->getCode()));
+			http_response_code($e->getCode());
 			header('Content-Type: text/html');
 			die(buildTransformException($e, $bridge));
 		}
@@ -194,7 +194,7 @@ try {
 		die;
 	}
 } catch(HttpException $e) {
-	header('HTTP/1.1 ' . $e->getCode() . ' ' . Http::getMessageForCode($e->getCode()));
+	http_response_code($e->getCode());
 	header('Content-Type: text/plain');
 	die($e->getMessage());
 } catch(\Exception $e) {

lib/Exceptions.php

@@ -2,64 +2,6 @@
 class HttpException extends \Exception{}
 
 /**
-* Not real http implementation but only utils stuff
-*/
-class Http{
-
-	/**
-	* Return message corresponding to Http code
-	*/
-	static public function getMessageForCode($code){
-		$codes = self::getCodes();
-
-		if(isset($codes[$code]))
-			return $codes[$code];
-
-		return '';
-	}
-
-	/**
-	* List of common Http code
-	*/
-	static public function getCodes(){
-		return array(
-			200 => 'OK',
-			201 => 'Created',
-			202 => 'Accepted',
-			300 => 'Multiple Choices',
-			301 => 'Moved Permanently',
-			302 => 'Moved Temporarily',
-			307 => 'Temporary Redirect',
-			310 => 'Too many Redirects',
-			400 => 'Bad Request',
-			401 => 'Unauthorized',
-			402 => 'Payment Required',
-			403 => 'Forbidden',
-			404 => 'Not Found',
-			405 => 'Method Not',
-			406 => 'Not Acceptable',
-			407 => 'Proxy Authentication Required',
-			408 => 'Request Time-out',
-			409 => 'Conflict',
-			410 => 'Gone',
-			411 => 'Length Required',
-			412 => 'Precondition Failed',
-			413 => 'Request Entity Too Large',
-			414 => 'Request-URI Too Long',
-			415 => 'Unsupported Media Type',
-			416 => 'Requested range unsatisfiable',
-			417 => 'Expectation failed',
-			500 => 'Internal Server Error',
-			501 => 'Not Implemented',
-			502 => 'Bad Gateway',
-			503 => 'Service Unavailable',
-			504 => 'Gateway Time-out',
-			508 => 'Loop detected',
-		);
-	}
-}
-
-/**
  * Returns an URL that automatically populates a new issue on GitHub based
  * on the information provided
  *