added http packages

3-error-handler.md

@@ -13,7 +13,7 @@ To install a new package, open up your `composer.json` and add the package to th
 ```
 "require": {
     "php": ">=5.5.0",
-    "filp/whoops": "~1.0"
+    "filp/whoops": ">=1.1.2"
 },
 ```
 

4-http.md

@@ -6,4 +6,21 @@ PHP already has a few things built in to make working with HTTP easier. For exam
 
 These are good if you just want to get a quick and dirty script runnin. But if you want to write clean, maintanable, [SOLID](http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29) code, then you will want a class with a nice object oriented interface that you can use in your application.
 
+Once again, you don't have to reinvent the wheel and just install a package. I decided to write my own [HTTP component](https://github.com/PatrickLouys/http).
+
+Some alternatives: [Symfony HttpFoundation](https://github.com/symfony/HttpFoundation), [Nette HTTP Component](https://github.com/nette/http), [Aura Http](https://github.com/auraphp/Aura.Http), [sabre/http](https://github.com/fruux/sabre-http)
+
+In this tutorial I will use my own HTTP component, but of course you can use whichever package you like most. Just change the code accordingly.
+
+Again, edit the `composer.json` to add the new component and then run `composer update`:
+
+```
+"require": {
+    "php": ">=5.5.0",
+    "filp/whoops": ">=1.1.2",
+    "patricklouys/http": ">=1.0.2"
+},
+```
+
+
 to be continued...