Add guards to every throw-able res.end call

Author: isaacs

Diff for: lib/node-http-proxy.js

@@ -404,8 +404,13 @@ HttpProxy.prototype.proxyRequest = function (req, res, options) {
     // then respond with `404` since we do not have a valid proxy target.
     //
     if (!location) {
-      res.writeHead(404);
-      return res.end();
+      try {
+        res.writeHead(404);
+        res.end();
+      } catch (er) {
+        console.error("res.writeHead/res.end error: %s", er.message);
+      }
+      return;
     }
 
     //
@@ -480,7 +485,11 @@ HttpProxy.prototype.proxyRequest = function (req, res, options) {
       }
     }
 
-    res.end();
+    try {
+      res.end();
+    } catch (er) {
+      console.error("res.end error: %s", er.message);
+    }
   }
 
   outgoing = {
@@ -508,7 +517,12 @@ HttpProxy.prototype.proxyRequest = function (req, res, options) {
 
     // `response.statusCode === 304`: No 'data' event and no 'end'
     if (response.statusCode === 304) {
-      return res.end();
+      try {
+        res.end();
+      } catch (er) {
+        console.error("res.end error: %s", er.message)
+      }
+      return;
     }
 
     // For each data `chunk` received from the `reverseProxy`
@@ -520,9 +534,12 @@ HttpProxy.prototype.proxyRequest = function (req, res, options) {
         try {
           res.write(chunk);
         } catch (er) {
+          console.error("res.write error: %s", er.message);
           try {
             res.end();
-          } catch (er) {}
+          } catch (er) {
+            console.error("res.end error: %s", er.message);
+          }
         }
       }
     });
@@ -535,7 +552,11 @@ HttpProxy.prototype.proxyRequest = function (req, res, options) {
     response.on('end', function () {
       if (!errState) {
         reverseProxy.removeListener('error', proxyError);
-        res.end();
+        try {
+          res.end();
+        } catch (er) {
+          console.error("res.end error: %s", er.message);
+        }
 
         // Emit the `end` event now that we have completed proxying
         self.emit('end', req, res);