---
name: ahserver-post-debugging
description: "Fix ahserver POST 405, upload hang, or empty params_kw."
version: "1.0.0"
tags: ["ahserver", "aiohttp", "post", "debugging"]
---

# ahserver POST Debugging

## 1. POST 405 — `_allowed_methods` not updated

`ProcessorResource.__init__` updates `_routes` but not `_allowed_methods`. aiohttp checks the latter.

**Fix:** After `self._routes.update(...)`, add:
```python
self._allowed_methods = set(self._routes.keys())
```

## 2. Upload hangs — `client_max_size` too small

Default `client_max_size: 10000` (bytes). Files >10KB hang silently.

**Fix:** Set in `conf/config.json`:
```json
"website": { "client_max_size": 104857600 }
```

## 3. `params_kw` empty for multipart — auth crashes

`getPostData()` → `get_session_user()` → `auth.get_auth()` raises `RuntimeError` without middleware. Exception breaks the multipart loop, `params_kw` stays empty.

**Fix:** In `auth_api.py`:
```python
async def get_session_userinfo(request):
    try:
        d = await auth.get_auth(request)
    except:
        d = None
    ...
```

## 4. Handler `request.read()` empty — body consumed

`getPostData()` already reads the body before handler runs. Use `params_kw` + `FileStorage.realPath()` instead.

## Diagnostic order

1. 405? → fix `_allowed_methods`
2. Small works, large hangs? → fix `client_max_size`
3. `params_kw` empty? → fix auth
4. Body empty? → use `params_kw`