Add Go and Rust forwarding examples (ngrok#774)

examples/go-sdk/http-forward-https.mdx

@@ -1,5 +1,28 @@
-:::info
+```go
+import (
+	"context"
+	"net/url"
 
-Forwarding to an upstream service is not supported by the Go SDK
+	"golang.ngrok.com/ngrok"
+	"golang.ngrok.com/ngrok/config"
+)
 
-:::
+func ngrokForwarder(ctx context.Context) (ngrok.Forwarder, error) {
+	backendUrl, err := url.Parse("https://localhost:8443")
+	if err != nil {
+		return nil, err
+	}
+
+	return ngrok.ListenAndForward(ctx,
+		backendUrl,
+		config.HTTPEndpoint(),
+		ngrok.WithAuthtokenFromEnv(),
+	)
+}
+```
+
+For HTTP/2 Use: `config.HTTPEndpoint(config.WithAppProtocol("http2"))`
+
+Go Package Docs:
+
+- [https://pkg.go.dev/golang.ngrok.com/ngrok#ListenAndForward](https://pkg.go.dev/golang.ngrok.com/ngrok#ListenAndForward)

examples/go-sdk/http-nonlocal.mdx

@@ -1,5 +1,26 @@
-:::info
+```go
+import (
+	"context"
+	"net/url"
 
-Forwarding to a non-local address is not supported by the Go SDK
+	"golang.ngrok.com/ngrok"
+	"golang.ngrok.com/ngrok/config"
+)
 
-:::
+func ngrokForwarder(ctx context.Context) (ngrok.Forwarder, error) {
+	backendUrl, err := url.Parse("http://192.168.1.2:80")
+	if err != nil {
+		return nil, err
+	}
+
+	return ngrok.ListenAndForward(ctx,
+		backendUrl,
+		config.HTTPEndpoint(),
+		ngrok.WithAuthtokenFromEnv(),
+	)
+}
+```
+
+Go Package Docs:
+
+- [https://pkg.go.dev/golang.ngrok.com/ngrok#ListenAndForward](https://pkg.go.dev/golang.ngrok.com/ngrok#ListenAndForward)

examples/go-sdk/tcp-nonlocal.mdx

@@ -1,5 +1,26 @@
-:::info
+```go
+import (
+	"context"
+	"net/url"
 
-Forwarding to a non-local address is not supported by the Go SDK
+	"golang.ngrok.com/ngrok"
+	"golang.ngrok.com/ngrok/config"
+)
 
-:::
+func ngrokForwarder(ctx context.Context) (ngrok.Forwarder, error) {
+	backendUrl, err := url.Parse("tcp://192.168.1.2:80")
+	if err != nil {
+		return nil, err
+	}
+
+	return ngrok.ListenAndForward(ctx,
+		backendUrl,
+		config.TCPEndpoint(),
+		ngrok.WithAuthtokenFromEnv(),
+	)
+}
+```
+
+Go Package Docs:
+
+- [https://pkg.go.dev/golang.ngrok.com/ngrok#ListenAndForward](https://pkg.go.dev/golang.ngrok.com/ngrok#ListenAndForward)

examples/rust-sdk/http-forward-https.mdx

@@ -1,5 +1,22 @@
-:::info
+```rust
+use ngrok::prelude::*;
+use ngrok::tunnel;
+use ngrok::forwarder::Forwarder;
+use url::Url;
 
-Forwarding to an upstream service is not supported by the Rust SDK
+async fn forward_ngrok() -> Result<Forwarder<tunnel::HttpTunnel>, Error> {
+    let sess = ngrok::Session::builder()
+        .authtoken_from_env()
+        .connect()
+        .await?;
+    sess
+        .http_endpoint()
+        .listen_and_forward(Url::parse("https://localhost:8443")?)
+        .await
+        .map_err(Into::into)
+}
+```
 
-:::
+Rust Crate Docs:
+
+- [https://docs.rs/ngrok/0.14.0-pre.13/ngrok/config/struct.HttpTunnelBuilder.html#method.listen_and_forward](https://docs.rs/ngrok/0.14.0-pre.13/ngrok/config/struct.HttpTunnelBuilder.html#method.listen_and_forward)

examples/rust-sdk/http-nonlocal.mdx

@@ -1,5 +1,22 @@
-:::info
+```rust
+use ngrok::prelude::*;
+use ngrok::tunnel;
+use ngrok::forwarder::Forwarder;
+use url::Url;
 
-Forwarding to a non-local address is not supported by the Rust SDK
+async fn forward_ngrok() -> Result<Forwarder<tunnel::HttpTunnel>, Error> {
+    let sess = ngrok::Session::builder()
+        .authtoken_from_env()
+        .connect()
+        .await?;
+    sess
+        .http_endpoint()
+        .listen_and_forward(Url::parse("http://192.168.1.2:80")?)
+        .await
+        .map_err(Into::into)
+}
+```
 
-:::
+Rust Crate Docs:
+
+- [https://docs.rs/ngrok/0.14.0-pre.13/ngrok/config/struct.HttpTunnelBuilder.html#method.listen_and_forward](https://docs.rs/ngrok/0.14.0-pre.13/ngrok/config/struct.HttpTunnelBuilder.html#method.listen_and_forward)

examples/rust-sdk/tcp-nonlocal.mdx

@@ -1,5 +1,22 @@
-:::info
+```rust
+use ngrok::prelude::*;
+use ngrok::tunnel;
+use ngrok::forwarder::Forwarder;
+use url::Url;
 
-Forwarding to a non-local address is not supported by the Rust SDK
+async fn forward_ngrok() -> Result<Forwarder<tunnel::TcpTunnel>, Error> {
+    let sess = ngrok::Session::builder()
+        .authtoken_from_env()
+        .connect()
+        .await?;
+    sess
+        .tcp_endpoint()
+        .listen_and_forward(Url::parse("tcp://127.0.0.1:8090")?)
+        .await
+        .map_err(Into::into)
+}
+```
 
-:::
+Rust Crate Docs:
+
+- [https://docs.rs/ngrok/0.14.0-pre.13/ngrok/config/struct.TcpTunnelBuilder.html#method.listen_and_forward](https://docs.rs/ngrok/0.14.0-pre.13/ngrok/config/struct.TcpTunnelBuilder.html#method.listen_and_forward)