fix(log error): handle optional target

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## [v1.1.2](https://github.com/chimurai/http-proxy-middleware/releases/tag/v1.1.2)
+
+- fix(log error): handle optional target ([#523](https://github.com/chimurai/http-proxy-middleware/pull/523))
+
 ## [v1.1.1](https://github.com/chimurai/http-proxy-middleware/releases/tag/v1.1.1)
 
 - fix(error handler): re-throw http-proxy missing target error ([#517](https://github.com/chimurai/http-proxy-middleware/pull/517))

README.md

@@ -298,7 +298,7 @@ Subscribe to [http-proxy events](https://github.com/nodejitsu/node-http-proxy#li
 - **option.onError**: function, subscribe to http-proxy's `error` event for custom error handling.
 
   ```javascript
-  function onError(err, req, res) {
+  function onError(err, req, res, target) {
     res.writeHead(500, {
       'Content-Type': 'text/plain',
     });

package.json

@@ -1,6 +1,6 @@
 {
   "name": "http-proxy-middleware",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "description": "The one-liner node.js proxy middleware for connect, express and browser-sync",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/http-proxy-middleware.ts

@@ -8,7 +8,6 @@ import * as handlers from './handlers';
 import { getArrow, getInstance } from './logger';
 import * as PathRewriter from './path-rewriter';
 import * as Router from './router';
-
 export class HttpProxyMiddleware {
   private logger = getInstance();
   private config: Config;
@@ -184,13 +183,14 @@ export class HttpProxyMiddleware {
     }
   };
 
-  private logError = (err, req: Request, res: Response) => {
-    const hostname = (req.headers && req.headers.host) || req.hostname || req.host; // (websocket) || (node0.10 || node 4/5)
-    const target = (this.proxyOptions.target as any).host || this.proxyOptions.target;
-    const errorMessage =
-      '[HPM] Error occurred while trying to proxy request %s from %s to %s (%s) (%s)';
+  private logError = (err, req: Request, res: Response, target) => {
+    const hostname = req.headers?.host || req.hostname || req.host; // (websocket) || (node0.10 || node 4/5)
+    const requestHref = `${hostname}${req.url}`;
+    const targetHref = `${target.href}`;
+
+    const errorMessage = '[HPM] Error occurred while proxying request %s to %s [%s] (%s)';
     const errReference = 'https://nodejs.org/api/errors.html#errors_common_system_errors'; // link to Node Common Systems Errors page
 
-    this.logger.error(errorMessage, req.url, hostname, target, err.code || err, errReference);
+    this.logger.error(errorMessage, requestHref, targetHref, err.code || err, errReference);
   };
 }