TTransportException's thrown from THttpClient contain superfluous slashes in the Exception message

This is a very minor issue, but should be addressed nonetheless.

The THttpClient class ensures the $uri_ property has a slash prefixed by appending one if needed in the constructor. However in THttpClient::read, there are 2 exceptions thrown where a slash is concatenated between the port and uri. This results in a superfluous slash in the TTransportException message.

Example:
"THttpClient: Could not read 184549154 bytes from xxx.yyy.com:80//randomService"