what kind of traffic fiddler can capture? -

when open fiddler, http traffic browser can captured.

i wrote program using .net httpwebrequest, traffic can captured.

also using python urllib2, fiddler captures http traffic.

does fiddler capture http traffic machine when open fiddler without changing default setting of fiddler? there's no custom filter of fiddler.

fiddler supposed proxy server. when it's opened?

fiddler proxy server. captures http, https, , ftp traffic sent it, , forwards traffic server.

by default, when fiddler starts, sets "system" proxy. most, not applications automatically send traffic fiddler reason. virtually other applications can reconfigured proxy traffic through fiddler.