++ Added HttpException::__toString() which takes care about any inner exceptions
+- Disallowed detaching HttpRequest objects from HttpRequestPool while executing progress callback
+* Fixed crash on detaching requests from pool in request event callbacks
+* Fixed suppression of nested exceptions in e.g. HttpRequestPool::send() (fixes bug #8535)
+* Fixed issues with inheritance and cloning of HttpDeflateStream, HttpInflateStream and HttpMessage
+ (Extending classes lose default properties on instantiation; Complex members ignored during cloning)