throw error objects instead of plain strings, update wisp server

client/javascript/http.js

@@ -67,13 +67,13 @@ class HTTPSession extends CurlSession {
         }
         if (error > 0) {
           error_msg(`Request "${url}" failed with error code ${error}: ${get_error_str(error)}`);
-          reject(`Request failed with error code ${error}: ${get_error_str(error)}`);
+          reject(new TypeError(`Request failed with error code ${error}: ${get_error_str(error)}`));
         }
         else if (error === -1) {
           reject(new DOMException("The operation was aborted."));
         }
         else if (error === -2) {
-          reject("Request failed because redirects were disallowed.");
+          reject(new TypeError("Request failed because redirects were disallowed."));
         }
         this.remove_request(http_handle);
         http_handle = null;

client/javascript/main.js

@@ -139,7 +139,7 @@ api = {
   CurlWebSocket: CurlWebSocket,
   TLSSocket: TLSSocket,
   HTTPSession: HTTPSession,
-  fetch() {throw "not ready"},
+  fetch() {throw new Error("not ready")},
   
   get copyright() {return copyright_notice},
   get version() {return get_version()},

client/javascript/session.js

@@ -24,7 +24,7 @@ class CurlSession {
 
   assert_ready() {
     if (!this.session_ptr) {
-      throw "session has been removed";
+      throw new Error("session has been removed");
     }
   }
 

client/javascript/util.js

@@ -70,7 +70,7 @@ function data_to_array(data) {
     return new Uint8Array(data.buffer);
   }
 
-  throw "invalid data type to be sent";
+  throw new TypeError("invalid data type to be sent");
 }
 
 //c function wrapper

client/javascript/ws_polyfill.js

@@ -62,7 +62,7 @@ class FakeWebSocket extends EventTarget {
           converted = data.buffer;
         }
         else {
-          throw "invalid binaryType string";
+          throw new TypeError("invalid binaryType string");
         }
       }