# error: http: request body too large

- **ID:** `go/net-http-request-body-too-large`
- **Domain:** go
- **Category:** config_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The HTTP request body exceeds the server's maximum body size limit, controlled by http.MaxBytesReader.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.20 | active | — | — |
| 1.21 | active | — | — |

## Workarounds

1. **Use http.MaxBytesReader to limit request body size** (95% success)
   ```
   r.Body = http.MaxBytesReader(w, r.Body, 10<<20) // 10 MB
if err := json.NewDecoder(r.Body).Decode(&data); err != nil { /* handle */ }
   ```

## Dead Ends

- **Setting MaxBytesReader to unlimited** — Security risk; always set a limit. (30% fail)