Handle basepath issue with missing slash

server/mux.go

@@ -47,8 +47,9 @@ func NewMux(opts MuxOpts, service Service) http.Handler {
 	})
 
 	if opts.Basepath != "" {
+		basePath := fmt.Sprintf("%s/", opts.Basepath)
 		// Prefix any URLs found in the React assets with any configured basepath
-		assets = NewDefaultURLPrefixer(opts.Basepath, assets, opts.Logger)
+		assets = NewDefaultURLPrefixer(basePath, assets, opts.Logger)
 	}
 
 	// Compress the assets with gzip if an accepted encoding

ui/src/utils/basepath.ts

@@ -6,7 +6,12 @@ export const getBasepath = () => {
     return ''
   }
 
-  return rootNode.getAttribute('data-basepath') || ''
+  let basepath = rootNode.getAttribute('data-basepath') || ''
+  if (basepath !== '') {
+    basepath = basepath.slice(0, basepath.length - 1)
+  }
+
+  return basepath
 }
 
 export const stripPrefix = (pathname, basepath = getBasepath()) => {