Fiddler

Fiddler is a proxy whose objective is to debug any problem with the HTTP traffic between your computer and Internet.

The different tabs that the program’s interface is divided into will let you quickly access the statistics of every Web page that you visit, or the so-called 'inspector', thanks to being able to see the contents of every request and response in the corresponding different formats.

More interesting options include the ability to set filters for both the traffic that you don’t care about, which will save you time, and for the time bar thanks to being able to see a specific HTTP session transfer.

Fiddler is a very thorough tool that, despite its small size, comes with a series of very interesting features for any user with intermediate to advanced knowledge.