w.Header().Set("Content-Type", item.contentType)
			fmt.Fprint(w, item.input)
		}))
		defer server.Close()

		// Replace source URL with our test server address.
		sourceURL := parseURLOrDie(item.sourceURL)
		serverURL := parseURLOrDie(server.URL)
		item.input = strings.Replace(item.input, sourceURL.Host, serverURL.Host, -1)
		item.redirect = strings.Replace(item.redirect, sourceURL.Host, serverURL.Host, -1)