@@ -165,7 +165,7 @@ export class XMLHttpRequest {
     private _listeners: Map<string, Array<Function>> = new Map<string, Array<Function>>();
 
     public addEventListener(eventName: string, handler: Function) {
-        if (eventName !== "load" && eventName !== "error") {
+        if (eventName !== "load" && eventName !== "error" && eventName !== "progress") {
             throw new Error("Event not supported: " + eventName);
         }
Original file line number	Diff line number	Diff line change
`@@ -165,7 +165,7 @@ export class XMLHttpRequest {`
`165`	`165`	`private _listeners: Map<string, Array<Function>> = new Map<string, Array<Function>>();`
`166`	`166`
`167`	`167`	`public addEventListener(eventName: string, handler: Function) {`
`168`		`- if (eventName !== "load" && eventName !== "error") {`
	`168`	`+ if (eventName !== "load" && eventName !== "error" && eventName !== "progress") {`
`169`	`169`	`throw new Error("Event not supported: " + eventName);`
`170`	`170`	`}`
`171`	`171`