__mitmproxy__ is a console tool that allows interactive examination and modification of HTTP traffic. Use the _?_ shortcut key to view, context-sensitive documentation from any __mitmproxy__ screen. ## Flow list The flow list shows an index of captured flows in chronological order. - __1__: A GET request, returning a 302 Redirect response. - __2__: A GET request, returning 16.75kb of text/html data. - __3__: A replayed request. - __4__: Intercepted flows are indicated with orange text. The user may edit these flows, and then accept them (using the _a_ key) to continue. In this case, the request has been intercepted on the way to the server. - __5__: A response intercepted from the server on the way to the client. - __6__: The event log can be toggled on and off using the _e_ shorcut key. This pane shows events and errors that may not result in a flow that shows up in the flow pane. - __7__: Flow count. - __8__: Various information on mitmproxy's state. In this case, we have an interception pattern set to ".*". - __9__: Bind address indicator - mitmproxy is listening on port 8080 of all interfaces. ## Flow view The __Flow View__ lets you inspect and manipulate a single flow: - __1__: Flow summary. - __2__: The Request/Response tabs, showing you which part of the flow you are currently viewing. In the example above, we're viewing the Response. Hit _tab_ to switch between the Response and the Request. - __3__: Headers. - __4__: Body. - __5__: View Mode indicator. In this case, we're viewing the body in __hex__ mode. The other available modes are __pretty__, which uses a number of heuristics to show you a friendly view of various content types, and __raw__, which shows you exactly what's there without any changes. You can change modes using the _m_ key. ## Key/Value Editor It turns out that ordered key/value data is pervasive in HTTP communications, so mitmproxy has a built-in editor to help edit and create this kind of data. There are three ways to reach the __K/V Editor__ from the __Flow View__ screen: - Editing request or response headers (_e_ for edit, then _h_ for headers) - Editing a query string (_e_ for edit, then _q_ for query) - Editing a URL-encoded form (_e_ for edit, then _f_ for form) If there is is no form or query string, an empty __K/V Editor__ will be started to let you add one. Here is the __K/V Editor__ showing the headers from a request: To edit, navigate to the key or value you want to modify using the arrow or vi navigation keys, and press enter. The background color will change to show that you are in edit mode for the specified field: Modify the field as desired, and press escape or enter to exit edit mode when you're done. You can also add a key/value pair (_a_ key), delete a pair (_d_ key), spawn an external editor on a field (_e_ key). Be sure to consult the context-sensitive help (_?_ key) for more. # Example: Interception __mitmproxy__'s interception functionality lets you pause an HTTP request or response, inspect and modify it, and then accept it to send it on to the server or client. ### 1: Set an interception pattern We press _i_ to set an interception pattern. In this case, the __~q__ filter pattern tells __mitmproxy__ to intercept all requests. For complete filter syntax, see the [Filter expressions](@!urlTo("filters.html")!@) section of this document, or the built-in help function in __mitmproxy__. ### 2: Intercepted connections are indicated with orange text: ### 3: You can now view and modify the request: In this case, we viewed the request by selecting it, pressed _e_ for "edit" and _m_ for "method" to change the HTTP request method. ### 4: Accept the intercept to continue: Finally, we press _a_ to accept the modified request, which is then sent on to the server. In this case, we changed the request from an HTTP GET to OPTIONS, and Google's server has responded with a 405 "Method not allowed".