Script Hooks Reference

// Fiddler Everywhere sample script.
//
// Security warning: scripts run in-process with the Fiddler backend and are not
// a hard security sandbox. Only run scripts you trust; scripts from untrusted
// sources may access available application resources and can contain harmful
// code. A non-cooperating tight loop or deep recursion can also hang or crash
// the backend process.

void OnBeforeRequest(Session oSession)
{
    // Runs when a client request is received, before it is sent to the server.
}

void OnBeforeResponse(Session oSession)
{
    // Runs when a server response is received, before it is returned to the client.
}

void OnPeekAtRequestHeaders(Session oSession)
{
    // Runs as soon as request headers are available (before the body is read).
}

void OnPeekAtResponseHeaders(Session oSession)
{
    // Runs as soon as response headers are available (before the body is read).
}

void OnSessionCompleted(Session oSession)
{
    // Runs after a session has fully completed.
}

void OnAttach()
{
    // Runs when Fiddler attaches as the system proxy.
}

void OnDetach()
{
    // Runs when Fiddler detaches as the system proxy.
}

void OnBoot()
{
    // Runs once when the Fiddler backend finishes starting up.
}

void OnShutdown()
{
    // Runs once when the Fiddler backend begins shutting down.
}

void OnValidateServerCertificate(ValidateServerCertificateEventArgs args)
{
    // Runs when a server's HTTPS certificate is evaluated.
    // Set args.ValidityState to override the default validation result, e.g.:
    // args.ValidityState = CertificateValidity.ForceValid;
}

void OnWebSocketMessage(WebSocketMessage oWSM)
{
    // Runs when a WebSocket message is captured.
}