To configure apps using the DEFAULT_PROXY option so that they proxy their traffic through Fiddler, you can use the proxycfg.exe (XP) or netsh.exe (Vista+) utilities.įor XP, you’d either specify the proxy manually: As noted by MSDN, the WinHTTP default proxy settings are not based on the WinINET proxy settings. While such apps can be configured to adopt the WinINET proxy settings of the current user (using the WinHttpGetIEProx圜onfigForCurrentUser function), some will instead pass WINHTTP_ACCESS_TYPE_DEFAULT_PROXY for the dwAccessType parameter to WinHttpOpen. WindowsUpdate patches and other content are typically downloaded by WinHTTP, often utilizing BITS, a higher-level abstraction that’s built atop HTTP’s “ranged download” capabilities.Īpplications built atop WinHTTP occasionally don’t respect the WinINET proxy setting. The WinHTTP stack is designed for use by services and applications that run without any UI. While Fiddler can work with all of them, applications that do not adopt the WinINET proxy settings will require additional configuration. However, Windows includes multiple HTTP(S) stacks. When Fiddler begins capturing as the “system proxy”, under the covers, it simply reconfigures the WinINET proxy settings to point at the Fiddler instance. Even applications that don’t rely on WinINET will typically still respect the proxy settings configured for WinINET using the Internet Options control panel. Most applications in Windows rely directly on the WinINET networking stack (used by IE, Office, and tens of thousands of other applications).
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