request.md

Access HTTP Request State

This guide addresses how to access information about the HTTP request associated with a session.

1. See the [How to > Access and Manipulate the URL](url) guide to learn how to work with the URL.

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The panel.state object holds a wide range of information about the HTTP request that is associated with a running session. Note that if you are running Panel inside a notebook session these attributes will simply return None.

Request arguments

The request arguments are made available to be accessed on pn.state.session_args. For example if your application is hosted at localhost:8001/app, appending ?phase=0.5 to the URL will allow you to access the phase variable using the following code:

try:
    phase = int(pn.state.session_args.get('phase')[0])
except Exception:
    phase = 1

This mechanism may be used to modify the behavior of an app depending on parameters provided in the URL.

Cookies

The panel.state.cookies will allow accessing the cookies stored in the browser and on the bokeh server.

Headers

The panel.state.headers will allow accessing the HTTP headers stored in the browser and on the bokeh server.

Related Resources