I have a blog post with a video on Fiddler AutoResponder that demonstrates the following:
- How to save a web page and its resources locally, and then use AutoResponder to return that local copy while the origin server is unavailable.
- How to easily modify a single response and return it to the client for subsequent requests.
- How to cause intentional delays for responses to determine the impact it has on rendering and facilitates testing alternative coding techniques.
- Causing a failed response for a resource to ensure the web page degrades gracefully