Added summary of #1 (#8)

* Added summary of #1

* Update http-client-meta.md

proposed/http-client/http-client-meta.md

@@ -28,6 +28,19 @@ client will allow libraries to be decoupled from an implementation such as Guzzl
 specify the default behaviours. 
 * The purpose is not to be opinionated about the use of middlewares (PSR-15).
 
+## Approaches
+
+### Exceptions
+
+Our the domain exceptions `NetworkException`, `RequestException` and `HttpException` define 
+a contract very similar to eachother. The choosen approach is to not let them extend each other
+because inheritance does not make sense in the domain model. A `RequestException` is not a 
+`NetworkException`. 
+
+Allowing exception to extend a `RequestAwareException` and/or `ResponseAwareException` interface
+has been discussed but that is a convenience shortcut that one should not take. One should rather
+catch the specific exceptions and handle them accordingly. 
+
 ## People
 
 ### 5.1 Editor