If you work in a company that uses Proxy authentication (aka forces you to enter a password to access websites) and are a developer you know my pain:
Some Most applications just don’t really like proxies. Visual Studio itself for example does not like proxy authentication at all and responses with a wide variety of error codes (407 for example).
You can get rid of all these errors through different workarounds, but these are a real PITA.
In addition the application you code itself needs Internet access, for example if you develop Office365 AddIns, you are very much screwed.
After a long research I finally found a solution using Fiddler.
Most developers already use Fiddler for debugging reasons so there isn’t even any software that needs to be installed.