It appears you were trying to get to a Web service with a browser which doesn't support HTTP/1.1 nor the common Host: extension to HTTP/1.0.
You should consider upgrading to a browser supporting HTTP/1.1 Host: header. Alternatively, can use a proxy server which supports the HTTP/1.1 Host: header (current proxy servers do). Refer to your Internet Service Provider's instructions on proxy usage.
Some web services can also be accessed by the following links, although there may be some problems: