niksis02 f7814adcf5 feat: adds fiber max connections and in-flight requests limiter ...

This is part of the thread exhaustion issue (#1815).

This PR introduces:

* A **maximum Fiber HTTP connections limit**
* A middleware that enforces a **hard limit on in-flight HTTP requests**

When the in-flight request limit is reached, the middleware returns an **S3-compatible `503 SlowDown`** error.

The same mechanism is implemented for the **admin server** (both max connections and max in-flight requests).

All limits are configurable via **CLI flags** and **environment variables**, for both the `s3api` server and the `admin` server.

---

| Setting         | CLI Flag            | Alias | Environment Variable  | Default |
| --------------- | ------------------- | ----- | --------------------- | ------- |
| Max Connections | `--max-connections` | `-mc` | `VGW_MAX_CONNECTIONS` | 250000  |
| Max Requests    | `--max-requests`    | `-mr` | `VGW_MAX_REQUESTS`    | 100000  |

---

| Setting         | CLI Flag                  | Alias  | Environment Variable        | Default |
| --------------- | ------------------------- | ------ | --------------------------- | ------- |
| Max Connections | `--admin-max-connections` | `-amc` | `VGW_ADMIN_MAX_CONNECTIONS` | 250000  |
| Max Requests    | `--admin-max-requests`    | `-amr` | `VGW_ADMIN_MAX_REQUESTS`    | 100000  |

2026-02-17 12:20:54 +04:00

..

presigned-urls.go

fix: fixes sigv4 and presigned url auth errors.

2025-09-18 00:11:12 +04:00

s3err.go

feat: adds fiber max connections and in-flight requests limiter

2026-02-17 12:20:54 +04:00

sigv4.go

fix: changes AuthorizationHeaderMalformed error status to 400

2025-12-30 12:21:54 +04:00