> For the complete documentation index, see [llms.txt](https://angelica.gitbook.io/hacktricks/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://angelica.gitbook.io/hacktricks/network-services-pentesting/pentesting-web/golang.md).

# Golang

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{% endhint %}

### CONNECT method

In the Go programming language, a common practice when handling HTTP requests, specifically using the `net/http` library, is the automatic conversion of the request path into a standardized format. This process involves:

* Paths ending with a slash (`/`) like `/flag/` are redirected to their non-slash counterpart, `/flag`.
* Paths containing directory traversal sequences such as `/../flag` are simplified and redirected to `/flag`.
* Paths with a trailing period as in `/flag/.` are also redirected to the clean path `/flag`.

However, an exception is observed with the use of the `CONNECT` method. Unlike other HTTP methods, `CONNECT` does not trigger the path normalization process. This behavior opens a potential avenue for accessing protected resources. By employing the `CONNECT` method alongside the `--path-as-is` option in `curl`, one can bypass the standard path normalization and potentially reach restricted areas.

The following command demonstrates how to exploit this behavior:

```bash
curl --path-as-is -X CONNECT http://gofs.web.jctf.pro/../flag
```

<https://github.com/golang/go/blob/9bb97ea047890e900dae04202a231685492c4b18/src/net/http/server.go#L2354-L2364>

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<details>

<summary>Support HackTricks</summary>

* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.

</details>
{% endhint %}


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