fix: Check for raw: and raw:// URLs before auto-appending https:// prefix

- Add raw HTML URL validation alongside http/https checks
- Fix URL preprocessing logic to handle raw: and raw:// prefixes
- Update error message and add comprehensive test cases

deploy/docker/server.py

@@ -237,9 +237,9 @@ async def get_markdown(
     body: MarkdownRequest,
     _td: Dict = Depends(token_dep),
 ):
-    if not body.url.startswith(("http://", "https://")):
+    if not body.url.startswith(("http://", "https://")) and not body.url.startswith(("raw:", "raw://")):
         raise HTTPException(
-            400, "URL must be absolute and start with http/https")
+            400, "Invalid URL format. Must start with http://, https://, or for raw HTML (raw:, raw://)")
     markdown = await handle_markdown_request(
         body.url, body.f, body.q, body.c, config, body.provider
     )
@@ -401,7 +401,7 @@ async def llm_endpoint(
 ):
     if not q:
         raise HTTPException(400, "Query parameter 'q' is required")
-    if not url.startswith(("http://", "https://")):
+    if not url.startswith(("http://", "https://")) and not url.startswith(("raw:", "raw://")):
         url = "https://" + url
     answer = await handle_llm_qa(url, q, config)
     return JSONResponse({"answer": answer})