Trying to open or access a URL which is correctly formatted but where the protocol is unknown or not supported gives the misleading error message "Improperly Formatted URL".

This caused me a lot of investigating when an installation problem meant that the SFTP kioslave (which I had happily been using in the past) had disappeared;  there was nothing wrong with the format of the URL but the protocol was not being recognised.


Reproducible: Always

Steps to Reproduce:
1. Open Konqueror
2. Type a URL in the address bar which is correctly formatted but  has an unknown protocol, for example "xxx://foo"

Actual Results:  
Error message page is displayed:

The requested operation could not be completed
Improperly Formatted URL

Details of the Request:
URL: xxx://foo
Protocol: xxx
Date and Time: Tuesday 02 July 2013 08:03
Additional Information: xxx://foo

Description:
The Uniform Resource Locator (URL) that you entered was not properly formatted. The format of a URL is generally as follows:

protocol://user:password@www.example.org:port/folder/filename.extension?query=value

Possible Solutions:
Double-check that you have entered the correct location and try again.


Expected Results:  
The message should explicitly say something to the effect that the protocol "xxx" was not recognised.


There is a case for this: ERR_UNSUPPORTED_PROTOCOL with the message "The protocol %1 is not supported." in kdelibs/kio/kio/global.cpp.  So it is just the error detection that is not working.