Until 1.0.5 using path "sap" in the configuration worked, since https://github.com/lemaiwo/ui5-middleware-route-proxy/commit/64c638bcb7b4d15ae2f55d29de857c83ac1d0192 it needs to be "/sap" since you/kovboyjder substituted
var dirname = req.url.replace(/^\/([^\/]*).*$/, '$1');
with
var dirname = Object.keys(routing).filter(sPath => req.url.startsWith(sPath))
as sPath always starts with a / (and in the regexp you had ^\/( which leaves the leading / outside).
Unfortunatly this is not reflected in the readme.md .
Until 1.0.5 using path "sap" in the configuration worked, since https://github.com/lemaiwo/ui5-middleware-route-proxy/commit/64c638bcb7b4d15ae2f55d29de857c83ac1d0192 it needs to be "/sap" since you/kovboyjder substituted
var dirname = req.url.replace(/^\/([^\/]*).*$/, '$1');withvar dirname = Object.keys(routing).filter(sPath => req.url.startsWith(sPath))as sPath always starts with a/(and in the regexp you had^\/(which leaves the leading/outside). Unfortunatly this is not reflected in the readme.md .