Merge pull request #2890 from mitmproxy/newdocs

All new documentation

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+---
+title: "Tools"
+menu: "overview"
+menu:
+    overview:
+        weight: 3
+---
+
+# Overview
+
+You should thin of the mitmproxy project's tools as a set of front-ends that
+expose the same underlying functionality. We aim to have feature parity across
+all of our tooling, and all tools share a common configuration mechanism and
+most command-line options.
+
+## mitmproxy
+
+{{< figure src="/screenshots/mitmproxy.png" >}}
+
+**mitmproxy** is a console tool that allows interactive examination and
+modification of HTTP traffic. It differs from mitmdump in that all flows are
+kept in memory, which means that it's intended for taking and manipulating
+small-ish samples. Use the `?` shortcut key to view, context-sensitive
+documentation from any **mitmproxy** screen.
+
+
+## mitmweb
+
+{{< figure src="/screenshots/mitmweb.png" >}}
+
+**mitmweb** is mitmproxy's web-based user interface that allows
+interactive examination and modification of HTTP traffic. Like
+mitmproxy, it differs from mitmdump in that all flows are kept in
+memory, which means that it's intended for taking and manipulating
+small-ish samples.
+
+{{% note %}}
+Mitmweb is currently in beta. We consider it stable for all features
+currently exposed in the UI, but it still misses a lot of mitmproxy's
+features.
+{{% /note %}}
+
+
+## mitmdump
+
+**mitmdump** is the command-line companion to mitmproxy. It provides
+tcpdump-like functionality to let you view, record, and programmatically
+transform HTTP traffic. See the `--help` flag output for complete
+documentation.
+
+
+### Example: Saving traffic
+
+{{< highlight bash  >}}
+mitmdump -w outfile
+{{< / highlight >}}
+
+Start up mitmdump in proxy mode, and write all traffic to **outfile**.
+
+### Filtering saved traffic
+
+{{< highlight bash  >}}
+mitmdump -nr infile -w outfile "~m post"
+{{< / highlight >}}
+
+Start mitmdump without binding to the proxy port (`-n`), read all flows
+from infile, apply the specified filter expression (only match POSTs),
+and write to outfile.
+
+### Client replay
+
+{{< highlight bash  >}}
+mitmdump -nc outfile
+{{< / highlight >}}
+
+Start mitmdump without binding to the proxy port (`-n`), then replay all
+requests from outfile (`-c filename`). Flags combine in the obvious way,
+so you can replay requests from one file, and write the resulting flows
+to another:
+
+{{< highlight bash  >}}
+mitmdump -nc srcfile -w dstfile
+{{< / highlight >}}
+
+See the [client-side replay]({{< relref "overview-features#client-side-replay"
+>}}) section for more information.
+
+### Running a script
+
+{{< highlight bash  >}}
+mitmdump -s examples/add_header.py
+{{< / highlight >}}
+
+This runs the **add_header.py** example script, which simply adds a new
+header to all responses.
+
+### Scripted data transformation
+
+{{< highlight bash  >}}
+mitmdump -ns examples/add_header.py -r srcfile -w dstfile
+{{< / highlight >}}
+
+This command loads flows from **srcfile**, transforms it according to
+the specified script, then writes it back to **dstfile**.
+