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When I open fiddler, http traffic from browser can be captured.
I wrote a program using .net HttpWebRequest, the traffic can also be captured.
Also using python urllib2, fiddler captures the http traffic.
Does fiddler capture all http traffic from my machine when I open fiddler without changing any default setting of fiddler? There's no custom filter of fiddler.
Fiddler is supposed to be proxy server. what does it do when it's opened?
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Fiddler is a free web debugging proxy that logs all HTTP/HTTPS traffic between your web application and the Internet.
Currently, Fiddler Everywhere supports preconfigured browser capturing only for Chromium browsers. The feature is useful when you need to capture browser traffic, but your environment doesn't allow you to change the system proxy or install and trust root certificates.
Can I use Fiddler to monitor FTP traffic? Yes, but Fiddler does not automatically register as the FTP proxy. If you would like to enable FTP interception, click Tools > Fiddler Options > Connections and tick the "Capture FTP requests" box.
As such fiddlercore don't work with TCP or UDP packets.
Fiddler is a proxy server. It captures HTTP, HTTPS, and FTP traffic that is sent to it, and then forwards that traffic to the server.
By default, when Fiddler starts, it sets itself as the "system" proxy. Most, but not all applications will automatically send their traffic to Fiddler for that reason. Virtually all other applications can be reconfigured to proxy their traffic through Fiddler.
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