fix websockets, add unit test for tls socket

client/tests/scripts/test_tls_socket.js

@@ -0,0 +1,27 @@
+function test() {
+  return new Promise((resolve, reject) => {
+    let socket = new libcurl.TLSSocket("cloudflare.com", 443, {verbose: 1});
+
+    socket.onopen = () => {
+      let str = "GET /cdn-cgi/trace HTTP/1.1\r\nHost: cloudflare.com\r\nConnection: close\r\n\r\n";
+      socket.send(new TextEncoder().encode(str));
+    };
+
+    socket.onmessage = (data) => {
+      let text = new TextDecoder().decode(data);
+      if (!text.includes("tls=TLSv1.3")) {
+        reject("cloudflare reported tls version mismatch"); 
+        return;
+      }
+      if (!text.includes("HTTP/1.1 200 OK")) {
+        reject("cloudflare reported http error"); 
+        return;
+      }
+      resolve();
+    };
+
+    socket.onerror = (error) => {
+      reject("socket error occurred " + error);
+    }
+  });
+}