feat(logging): remove errno dependency & add link to Node errors page.

lib/index.js

@@ -1,6 +1,5 @@
 var _              = require('lodash');
 var httpProxy      = require('http-proxy');
-var errno          = require('errno');
 var configFactory  = require('./config-factory');
 var handlers       = require('./handlers');
 var contextMatcher = require('./context-matcher');
@@ -129,14 +128,10 @@ function HttpProxyMiddleware(context, opts) {
     }
 
     function logError(err, req, res) {
-        var hostname = (req.headers && req.headers.host) || (req.hostname || req.host); // (websocket) || (node0.10 || node 4/5)
+        var hostname = (req.headers && req.headers.host) || (req.hostname || req.host);     // (websocket) || (node0.10 || node 4/5)
         var target = proxyOptions.target.host || proxyOptions.target;
-        var description =  errno.code[err.code] && errno.code[err.code].description;    //  description for the error code
-
-        if (description) {
-            logger.error('[HPM] Error \'%s\' (ErrorCode=%s) occurred while trying to proxy request %s from %s to %s', description, err.code, req.url, hostname, target);
-        } else {
-            logger.error('[HPM] Error (ErrorCode=%s) occurred while trying to proxy request %s from %s to %s', err.code, req.url, hostname, target);
-        }
+        var errReference = 'https://nodejs.org/api/errors.html#errors_common_system_errors'; // link to Node Common Systems Errors page
+
+        logger.error('[HPM] Error occurred while trying to proxy request %s from %s to %s (%s) \n(%s)', req.url, hostname, target, err.code, errReference);
     }
 };

package.json

@@ -51,7 +51,6 @@
     "http-proxy": "^1.14.0",
     "is-glob": "^2.0.1",
     "lodash": "^4.14.2",
-    "micromatch": "^2.3.11",
-    "errno": "^0.1.4"
+    "micromatch": "^2.3.11"
   }
 }