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---
title: "Scripting"
menu:
addons:
weight: 5
---
# Scripting HTTP/1.1 and HTTP/2.0
Sometimes, we would like to write a quick script without going through the
trouble of creating a class. The addons mechanism has a shorthand that allows a
module as a whole to be treated as an addon object. This lets us place event
handler functions in the module scope. For instance, here is a complete script
that adds a header to every request.
{{< example src="examples/addons/scripting-headers.py" lang="py" >}}
Here's another example that intercepts requests to a particular URL and sends
an arbitrary response instead:
{{< example src="examples/simple/send_reply_from_proxy.py" lang="py" >}}
All events around the HTTP protocol [can be found here]({{< relref "addons-events#http-events">}}).
For HTTP-related objects, please look at the [http][] module, or the
[Request][], and [Response][] classes for other attributes that you can use when
scripting.
# Scripting WebSocket
The WebSocket protocol initially looks like a regular HTTP request, before the client and server agree to upgrade the connection to WebSocket. All scripting events for initial HTTP handshake, and also the dedicated WebSocket events [can be found here]({{< relref "addons-events#websocket-events">}}).
{{< example src="examples/simple/websocket_messages.py" lang="py" >}}
For WebSocket-related objects please look at the [websocket][] module to find
all attributes that you can use when scripting.
[websocket]: https://github.com/mitmproxy/mitmproxy/blob/master/mitmproxy/websocket.py
# Scripting TCP
All events around the TCP protocol [can be found here]({{< relref "addons-events#tcp-events">}}).
{{< example src="examples/complex/tcp_message.py" lang="py" >}}
For WebSocket-related objects please look at the [tcp][] module to find
all attributes that you can use when scripting.
[tcp]: https://github.com/mitmproxy/mitmproxy/blob/master/mitmproxy/tcp.py
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