Convert action to ts

- Add optional header support
- Add optional body support

src/http.ts

@@ -0,0 +1,26 @@
+class Http {
+  async make(url: string, headers: string, body: string): Promise<any> {
+    return new Promise((resolve, reject) => {
+      fetch(url, this.getOptions('post', headers, body))
+        .then((res) => resolve(res.body))
+        .catch((res) => reject(res.body));
+    });
+  }
+
+  getOptions(method: string, headers: string, body: string) {
+    const options: any = {
+      headers: JSON.parse(headers),
+      method
+    };
+
+    // stringify the body
+    options.body = JSON.stringify(body);
+
+    // set these headers
+    options.headers['content-type'] = 'application/json';
+
+    return options;
+  }
+}
+
+export const http = new Http();