Added dynamic urls instead of a static ones.

Backend/Main.py

@@ -10,8 +10,7 @@ if str(ApplicationDirectory) not in sys.path:
 
 from fastapi import Depends, FastAPI, File, HTTPException, Request, Response, UploadFile
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import PlainTextResponse, StreamingResponse
-from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse, PlainTextResponse, StreamingResponse
 
 from Auth import CreateSession, DeleteSession, GetCurrentUser, RequireAdmin, SessionCookieName
 from BookReader import ReadBookForFile
@@ -704,5 +703,15 @@ def DeleteThemeEndpoint(Name: str, CurrentUser: dict = Depends(GetCurrentUser))
 
 
 FrontendDist = ApplicationDirectory.parent / "Frontend" / "dist"
+
 if FrontendDist.is_dir():
-    Application.mount("/", StaticFiles(directory=str(FrontendDist), html=True), name="Frontend")
+
+    @Application.get("/{FullPath:path}")
+    def ServeFrontendEndpoint(FullPath: str):
+        CandidatePath = (FrontendDist / FullPath).resolve()
+        IsWithinDist = CandidatePath == FrontendDist or FrontendDist in CandidatePath.parents
+
+        if FullPath and IsWithinDist and CandidatePath.is_file():
+            return FileResponse(CandidatePath)
+
+        return FileResponse(FrontendDist / "index.html")