# go: module github.com/user/module@v1.0.0: reading https://proxy.golang.org/github.com/user/module/@v/v1.0.0.mod: 404 Not Found

- **ID:** `go/module-not-found`
- **Domain:** go
- **Category:** module_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The module version does not exist or has been deleted, often due to tag removal after release or incorrect version number.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.16 | active | — | — |
| 1.17 | active | — | — |
| 1.18 | active | — | — |

## Workarounds

1. **检查模块版本并更新到正确版本** (60% success)
   ```
   go list -m -versions github.com/user/module
# 如果有可用版本，更新go.mod
require github.com/user/module v1.0.1
   ```
2. **使用GONOSUMCHECK和GONOSUMDB绕过代理** (40% success)
   ```
   export GONOSUMCHECK=*; export GONOSUMDB=*; go get github.com/user/module@v1.0.0
   ```

## Dead Ends

- **尝试手动下载模块并放入vendor目录** — go mod vendor不会自动填充缺失的模块，需要先解决依赖关系。 (70% fail)
- **使用go get -u强制更新所有依赖** — 如果模块版本不存在，更新不会修复缺失的版本。 (80% fail)