Add docs from gofiber/fiber@57164ca

Author: github-actions[bot]

docs/core/api/ctx.md

@@ -2045,6 +2045,32 @@ app.Get("/", func(c fiber.Ctx) error {
 })
 ```
 
+### SendEarlyHints
+
+Sends an informational `103 Early Hints` response with one or more
+[`Link` headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Link)
+before the final response. This allows the browser to start preloading
+resources while the server prepares the full response.
+
+:::caution
+This feature requires HTTP/2 or newer. Some legacy HTTP/1.1 clients may not
+Early Hints (`103` responses) are supported in HTTP/2 and newer. Older HTTP/1.1 clients may ignore these interim responses or misbehave when receiving them.
+:::
+
+```go title="Signature"
+func (c fiber.Ctx) SendEarlyHints(hints []string) error
+```
+
+```go title="Example"
+hints := []string{"<https://cdn.com/app.js>; rel=preload; as=script"}
+app.Get("/early", func(c fiber.Ctx) error {
+  if err := c.SendEarlyHints(hints); err != nil {
+    return err
+  }
+  return c.SendString("done")
+})
+```
+
 ### SendFile
 
 Transfers the file from the given path. Sets the [Content-Type](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type) response HTTP header field based on the **file** extension or format.

docs/core/whats_new.md

@@ -464,6 +464,7 @@ testConfig := fiber.TestConfig{
 - **IsProxyTrusted**: Checks the trustworthiness of the remote IP.
 - **Reset**: Resets context fields for server handlers.
 - **Schema**: Similar to Express.js, returns the schema (HTTP or HTTPS) of the request.
+- **SendEarlyHints**: Sends `HTTP 103 Early Hints` status code with `Link` headers so browsers can preload resources while the final response is being prepared.
 - **SendStream**: Similar to Express.js, sends a stream as the response.
 - **SendStreamWriter**: Sends a stream using a writer function.
 - **SendString**: Similar to Express.js, sends a string as the response.
@@ -503,6 +504,22 @@ testConfig := fiber.TestConfig{
   [RFC 8187](https://www.rfc-editor.org/rfc/rfc8187).
 - **Context()**: Renamed to `RequestCtx()` to access the underlying `fasthttp.RequestCtx`.
 
+### SendEarlyHints
+
+`SendEarlyHints` sends an informational [`103 Early Hints`](https://developer.chrome.com/docs/web-platform/early-hints) response with `Link` headers based on the provided `hints` argument. This allows a browser to start preloading assets while the server is still preparing the final response.
+
+```go
+hints := []string{"<https://cdn.com/app.js>; rel=preload; as=script"}
+app.Get("/early", func(c fiber.Ctx) error {
+    if err := c.SendEarlyHints(hints); err != nil {
+        return err
+    }
+    return c.SendString("done")
+})
+```
+
+Older HTTP/1.1 clients may ignore these interim responses or handle them inconsistently.
+
 ### SendStreamWriter
 
 In v3, we introduced support for buffered streaming with the addition of the `SendStreamWriter` method: