F: add transport

cloudflare/fetch/client.go

@@ -1,6 +1,7 @@
 package fetch
 
 import (
+	"net/http"
 	"syscall/js"
 
 	"github.com/syumai/workers/internal/jsutil"
@@ -19,6 +20,15 @@ func (c *Client) applyOptions(opts []ClientOption) {
 	}
 }
 
+// HTTPClient returns *http.Client.
+func (c *Client) HTTPClient() *http.Client {
+	return &http.Client{
+		Transport: &transport{
+			namespace: c.namespace,
+		},
+	}
+}
+
 // ClientOption is a type that represents an optional function.
 type ClientOption func(*Client)
 

cloudflare/fetch/transport.go

@@ -0,0 +1,17 @@
+package fetch
+
+import (
+	"net/http"
+	"syscall/js"
+)
+
+// transport is an implementation of http.RoundTripper
+type transport struct {
+	// namespace - Objects that Fetch API belongs to. Default is Global
+	namespace js.Value
+}
+
+// RoundTrip replaces http.DefaultTransport.RoundTrip to use cloudflare fetch
+func (t *transport) RoundTrip(req *http.Request) (*http.Response, error) {
+	return fetch(t.namespace, req)
+}