Charles is a Java-based HTTP proxy/HTTP monitor/Reverse Proxy that enables a developer to view all of the HTTP traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).
Charles can also simulate modem speeds by effectively throttling your bandwidth and introducing latency, so that you can experience an entire website as a modem user might.
Electronic circuit simulator. Circuit simulation is a way of building and testing virtual models of electronic devices.
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