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+---
+title: "Client replay"
+menu:
+    tutes:
+        weight: 1
+---
+
+# Client playback: a 30 second example
+
+My local cafe is serviced by a rickety and unreliable wireless network,
+generously sponsored with ratepayers' money by our city council. After
+connecting, you are redirected to an SSL-protected page that prompts you for a
+username and password. Once you've entered your details, you are free to enjoy
+the intermittent dropouts, treacle-like speeds and incorrectly configured
+transparent proxy.
+
+I tend to automate this kind of thing at the first opportunity, on the theory
+that time spent now will be more than made up in the long run. In this case, I
+might use [Firebug](https://getfirebug.com/) to ferret out the form post
+parameters and target URL, then fire up an editor to write a little script using
+Python's [urllib](https://docs.python.org/library/urllib.html) to simulate a
+submission. That's a lot of futzing about. With mitmproxy we can do the job in
+literally 30 seconds, without having to worry about any of the details. Here's
+how.
+
+## 1. Run mitmdump to record our HTTP conversation to a file.
+
+{{< highlight bash  >}}
+mitmdump -w wireless-login
+{{< / highlight >}}
+
+## 2. Point your browser at the mitmdump instance.
+
+I use a tiny Firefox addon called [Toggle
+Proxy](https://addons.mozilla.org/en-us/firefox/addon/toggle-proxy-51740/) to
+switch quickly to and from mitmproxy. I'm assuming you've already [configured
+your browser with mitmproxy's SSL certificate authority]({{< relref
+"concepts-certificates" >}}).
+
+## 3. Log in as usual
+
+And that's it\! You now have a serialised version of the login process
+in the file wireless-login, and you can replay it at any time like this:
+
+{{< highlight bash  >}}
+mitmdump -c wireless-login
+{{< / highlight >}}
+
+## Embellishments
+
+We're really done at this point, but there are a couple of embellishments we
+could make if we wanted. I use [wicd](https://launchpad.net/wicd) to
+automatically join wireless networks I frequent, and it lets me specify a
+command to run after connecting. I used the client replay command above and
+voila\! - totally hands-free wireless network startup.
+
+We might also want to prune requests that download CSS, JS, images and so forth.
+These add only a few moments to the time it takes to replay, but they're not
+really needed and I somehow feel compelled to trim them anyway. So, we fire up
+the mitmproxy console tool on our serialised conversation, like so:
+
+{{< highlight bash  >}}
+mitmproxy -r wireless-login
+{{< / highlight >}}
+
+We can now go through and manually delete (using the <span
+data-role="kbd">d</span> keyboard shortcut) everything we want to trim. When
+we're done, we use <span data-role="kbd">w</span> to save the conversation back
+to the file.