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I’m testing a Google App Engine app on my Windows machine, running locally on localhost:8084. Fiddler2 shows all my activity when I navigate around my app, but when requesting an external url with urlfetch.fetch() it doesn’t show up in Fiddler at all, even when using an http, not an https address, and with a successful status code 200 in the response.
What do I need to do to get the urlfetch.fetch() request from Google App Engine to show up in Fiddler2?
My understanding is that Fiddler2 runs as an HTTP proxy; browser requests go through this proxy instead of directly to the internet resource. This allows Fiddler2 to capture information about the request and the response.
According to the Fiddler2 docs, “You can configure any application which accepts a HTTP Proxy to run through Fiddler so you can debug its traffic”. So I think you would need to change the URLFetch API call to use a proxy, supplying the Fiddler URL and port. However, the URLFetch documentation doesn’t specify exactly how to do this. You might be able to use urllib2 as specified in this question.