1 files changed, 32 insertions, 0 deletions
diff --git a/webAO/services/request.js b/webAO/services/request.js
new file mode 100644
index 0000000..6479dcc
--- /dev/null
+++ b/webAO/services/request.js
@@ -0,0 +1,32 @@
+/**
+ * Make a GET request for a specific URI.
+ * @param {string} url the URI to be requested
+ * @returns response data
+ * @throws {Error} if status code is not 2xx, or a network error occurs
+ */
+const request = async (url) => new Promise((resolve, reject) => {
+  const xhr = new XMLHttpRequest();
+  xhr.responseType = 'text';
+  xhr.addEventListener('error', () => {
+    const err = new Error(`Request for ${url} failed: ${xhr.statusText}`);
+    err.code = xhr.status;
+    reject(err);
+  });
+  xhr.addEventListener('abort', () => {
+    const err = new Error(`Request for ${url} was aborted!`);
+    err.code = xhr.status;
+    reject(err);
+  });
+  xhr.addEventListener('load', () => {
+    if (xhr.status < 200 || xhr.status >= 300) {
+      const err = new Error(`Request for ${url} failed with status code ${xhr.status}`);
+      err.code = xhr.status;
+      reject(err);
+    } else {
+      resolve(xhr.response);
+    }
+  });
+  xhr.open('GET', url, true);
+  xhr.send();
+});
+export default request;