How to remove leading slashes on GET requests?

Dash Python
1

I am attempting to put Dash behind some Java middleware called (shinyproxy)[https://www.shinyproxy.io/] however since the requests are being handled by the middleware there are some Dash resources that fail to load. 404s occur on

_dash-layout
_dash-dependencies

I’ve asked about this on the shinyproxy forum this was the advice I received:

that means the href being used was “/_dash-layout” and not “_dash-layout”. Do you control the hrefs? If so, removing the slash may solve your issue.

I’ve been trying to remove the leading slash.

Attempt 1

server = flask.Flask(__name__)
app = dash.Dash(__name__, server=server, url_base_pathname='')

This breaks the app with the following error: ValueError: urls must start with a leading slash

Attempt 2
Taken from the responses on the question Deploy Dash on apache server I tried to remove prefixes

app.config.update({
    # as the proxy server will remove the prefix
    'routes_pathname_prefix': ''

    # the front-end will prefix this string to the requests
    # that are made to the proxy server
    , 'requests_pathname_prefix': ''
})

But that was probably never going to work!

Do you have any advice on removing the slashes for the requests? Or alternative solutions?

2

It’s working!

The solution was coded in the Dash code as follows:

# In order to work on shinyproxy
app.config.supress_callback_exceptions = True
app.config.update({
    # as the proxy server will remove the prefix
    'routes_pathname_prefix': ''

    # the front-end will prefix this string to the requests
    # that are made to the proxy server
    , 'requests_pathname_prefix': ''
})
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