# aiohttp.client_exceptions.InvalidURL: invalid URL http://

- **ID:** `python/aiohttp-invalid-url`
- **Domain:** python
- **Category:** data_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The URL passed to aiohttp request is malformed or empty, such as missing host or scheme.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |

## Workarounds

1. **Validate and construct URL using yarl.URL** (95% success)
   ```
   from yarl import URL; url = URL('http://example.com')
   ```
2. **Use urllib.parse to sanitize the URL** (85% success)
   ```
   from urllib.parse import urlparse; parsed = urlparse(url); if not parsed.scheme: url = 'http://' + url
   ```

## Dead Ends

- **Adding extra slashes to the URL** — Malformed URLs are not fixed by adding slashes; proper validation is needed. (50% fail)
- **Using a relative URL without base** — aiohttp requires absolute URLs; relative paths cause InvalidURL. (80% fail)