diff --git a/src/xhrListener.ts b/src/xhrListener.ts
index 0210060..a327875 100644
--- a/src/xhrListener.ts
+++ b/src/xhrListener.ts
@@ -26,26 +26,26 @@ class XhrListener {
     logger.debugLog.info("XhrListener running");
   }
 
-  public relayEvent(event: string, channel: string):boolean {
+  public relayEvent(event: string, channel: string): boolean {
     logger.debugLog.info(`XhrListener:relayEvent(event: ${event}, channel: ${channel})`);
     for (let c of this.#cm.channels) {
       if (channel === c.id) {
-	let dmCount:number = 0;
-	for (let client of c.clients) {
-	  let nonce:string = crypto.randomBytes(4).toString("hex");
-	  // TODO: verify the nonce against the received reply, which we currently ignore
-	  client.directMessage(JSON.stringify({message_type:"broadcast", message:{event_type:event, seq_id:nonce}}));
-	  dmCount++;
-	}
-	// dmCount of 1 would be normal. more than 1 is odd, but not necessarily bad. 0 means Exam UI has gone away somehow.
-	return dmCount > 0;
+        let dmCount: number = 0;
+        for (let client of c.clients) {
+          let nonce: string = crypto.randomBytes(4).toString("hex");
+          // TODO: verify the nonce against the received reply, which we currently ignore
+          client.directMessage(JSON.stringify({ message_type: "broadcast", message: { event_type: event, seq_id: nonce } }));
+          dmCount++;
+        }
+        // dmCount of 1 would be normal. more than 1 is odd, but not necessarily bad. 0 means Exam UI has gone away somehow.
+        return dmCount > 0;
       }
     }
     // did not match a channel; examId isn't valid for some reason
     return false;
   }
 
-  public onRequestEnded(body: Uint8Array[], request: IncomingMessage, response: ServerResponse):void {
+  public onRequestEnded(body: Uint8Array[], request: IncomingMessage, response: ServerResponse): void {
     logger.debugLog.info("XhrListener:onRequestEnded()");
     if (request.method === 'OPTIONS') {
       logger.debugLog.info("handling CORS preflight");
@@ -59,56 +59,56 @@ class XhrListener {
       logger.debugLog.info("parsing Archimedes event: " + body);
       let endpoint = url.parse(request.url).pathname
       let returnVal: [number, string] = [-1, ""];
-      let authorized:boolean = request.headers['x-proctoru-signature'] === AUTH_TOKEN;
+      let authorized: boolean = request.headers['x-proctoru-signature'] === AUTH_TOKEN;
 
       // body of POST is JSON: '{"examId":"proctor_u_id"}'
       switch (true) {
-	// match /event/pause*
+        // match /event/pause*
         case /^\/event\/pause([/]+.*)*$/.test(endpoint):
-	  if (authorized) {
-            let amsg:ArchimedesMessage = JSON.parse(Buffer.concat(body).toString());
-	    if (this.relayEvent("pauseExam", amsg.examId)) {
-	      returnVal = [200, "pause event was successfully relayed"];
+          if (authorized) {
+            let amsg: ArchimedesMessage = JSON.parse(Buffer.concat(body).toString());
+            if (this.relayEvent("pauseExam", amsg.examId)) {
+              returnVal = [200, "pause event was successfully relayed"];
             } else {
-	      logger.errorLog.info(`XhrListener: could not relay pause event "${amsg}" to Exam UI; body: "${body}"`);
-	      returnVal = [400, "error while relaying pause event"];
-	    }
+              logger.errorLog.info(`XhrListener: could not relay pause event "${amsg}" to Exam UI; body: "${body}"`);
+              returnVal = [400, "error while relaying pause event"];
+            }
           }
 
-	  break;
+          break;
 
-	// match /event/resume*
+        // match /event/resume*
         case /^\/event\/resume([/]+.*)*$/.test(endpoint):
-	  if (authorized) {
-            let amsg:ArchimedesMessage = JSON.parse(Buffer.concat(body).toString());
-	    if (this.relayEvent("resumeExam", amsg.examId)) {
-	      returnVal = [200, "resume event was successfully relayed"];
+          if (authorized) {
+            let amsg: ArchimedesMessage = JSON.parse(Buffer.concat(body).toString());
+            if (this.relayEvent("resumeExam", amsg.examId)) {
+              returnVal = [200, "resume event was successfully relayed"];
             } else {
-	      logger.errorLog.info(`XhrListener: could not relay resume event "${amsg}" to Exam UI; body: "${body}"`);
-	      returnVal = [400, "error while relaying resume event"];
-	    }
+              logger.errorLog.info(`XhrListener: could not relay resume event "${amsg}" to Exam UI; body: "${body}"`);
+              returnVal = [400, "error while relaying resume event"];
+            }
           }
-	  break;
+          break;
 
-	default:
-	  logger.errorLog.info(`XhrListener: bad event or other request; body: "${body}"`);
-	  returnVal = [400, "Bad request"];
-	  break;
+        default:
+          logger.errorLog.info(`XhrListener: bad event or other request; body: "${body}"`);
+          returnVal = [400, "Bad request"];
+          break;
       };
 
       if (-1 == returnVal[0]) {
-	response.writeHead(authorized ? 400 : 401);
-	response.end();
+        response.writeHead(authorized ? 400 : 401);
+        response.end();
       } else {
-	response.writeHead(returnVal[0], {'Content-Type': 'application/json'});
+        response.writeHead(returnVal[0], { 'Content-Type': 'application/json' });
         response.end(JSON.stringify(returnVal[1]));
       }
     }
   }
 
-  private onRequest(request: IncomingMessage, response: ServerResponse):void {
+  private onRequest(request: IncomingMessage, response: ServerResponse): void {
     logger.debugLog.info("XhrListener:onRequest()");
-    let body:Uint8Array[] = [];
+    let body: Uint8Array[] = [];
     request.on('data', post_block => body.push(post_block));
 
     request.on('end', () => {