diff --git a/public/openbttn/request.js b/public/openbttn/request.js
new file mode 100644
index 0000000..c0f54d3
--- /dev/null
+++ b/public/openbttn/request.js
@@ -0,0 +1,36 @@
+'use strict';
+
+let requestAuthKey = null;
+
+function request(body, timeout = 5000) {
+	let xhr = new XMLHttpRequest();
+	xhr.open('POST', `http://${location.hostname}:8774/socket`);
+
+	return new Promise(function (resolve, reject) {
+		xhr.onload = function (e) {
+			if (xhr.status === 200) {
+				resolve(xhr.responseText);
+			} else if ([400, 403, 500].includes(xhr.status)) {
+				reject(`${xhr.statusText}: ${xhr.responseText}`);
+			} else {
+				reject(`Unknown response: ${xhr.status} ${xhr.statusText} (${xhr.responseText})`)
+			}
+		};
+		xhr.ontimeout = (e) => reject('Request timed out!');
+		xhr.onerror = (e) => reject('Error communicating with bttn!');
+
+		xhr.timeout = timeout;
+
+		if (requestAuthKey) {
+			body = 'auth = ' + requestAuthKey + '\n' + body;
+		}
+		xhr.send(body);
+	});
+}
+
+function setRequestAuthKey(key) {
+	requestAuthKey = key;
+}
+
+window.request = request;
+window.setRequestAuthKey = setRequestAuthKey;