Drop cache headers from error responses.

Closes #107 (github), JIRA CDB-1423 #resolve

NOTE: does not choke on headers cleanup when response headers are not set,
      but raises a WARNING instead (JIRA CDB-1438 #resolve)

NEWS.md

@@ -1,3 +1,10 @@
+1.5.3 -- 2014-01-DD
+-------------------
+
+Bug fixes:
+
+* Drop cache headers from error responses (#107)
+
 1.5.2 -- 2013-12-05
 -------------------
 

lib/cartodb/cartodb_windshaft.js

@@ -34,6 +34,20 @@ var CartodbWindshaft = function(serverOptions) {
       return version;
     }
 
+    // Override sendError to drop added cache headers (if any)
+    // See http://github.com/CartoDB/Windshaft-cartodb/issues/107
+    var ws_sendError = ws.sendError;
+    ws.sendError = function(res) {
+      if ( res._headers ) {
+        delete res._headers['cache-control'];
+        delete res._headers['last-modified'];
+        delete res._headers['x-cache-channel'];
+      } else {
+        console.log("WARNING: response has no _headers: "); console.dir(res);
+      }
+      ws_sendError.apply(this, arguments);
+    };
+
     /**
      * Helper to allow access to the layer to be used in the maps infowindow popup.
      */

test/acceptance/server.js

@@ -125,6 +125,7 @@ suite('server', function() {
           assert.equal(res.statusCode, 400, res.body);
           assert.deepEqual(JSON.parse(res.body),
             {error: 'Sorry, you are unauthorized (permission denied)'});
+          assert.ok(!res.headers.hasOwnProperty('cache-control'));
           done();
         });
     });
@@ -142,6 +143,7 @@ suite('server', function() {
           assert.equal(res.statusCode, 400, res.statusCode + ': ' + res.body);
           assert.deepEqual(JSON.parse(res.body),
             {error:"missing unknown_user's database_name in redis (try CARTODB/script/restore_redis)"});
+          assert.ok(!res.headers.hasOwnProperty('cache-control'));
           done();
         });
     });
@@ -212,9 +214,12 @@ suite('server', function() {
             url: '/tiles/my_table/style',
             method: 'POST'
         },{
-            status: 400,
             body: '{"error":"must send style information"}'
-        }, function() { done(); });
+        }, function(res) {
+          assert.equal(res.statusCode, 400);
+          assert.ok(!res.headers.hasOwnProperty('cache-control'));
+          done();
+        });
     });
     
     test("post'ing bad style returns 400 with error", function(done){
@@ -766,6 +771,8 @@ suite('server', function() {
           assert.equal(res.statusCode, 400, res.statusCode + ': ' + res.body);
           assert.deepEqual(JSON.parse(res.body),
             {error:"missing unknown_user's database_name in redis (try CARTODB/script/restore_redis)"});
+          assert.ok(!res.headers.hasOwnProperty('cache-control'),
+            "Unexpected Cache-Control: " + res.headers['cache-control']);
           done();
         });
     });
@@ -786,6 +793,9 @@ suite('server', function() {
         }, function(res) {
           // 401 Unauthorized
           assert.equal(res.statusCode, 401, res.statusCode + ': ' + res.body);
+          // Failed in 1.6.0 of https://github.com/CartoDB/Windshaft-cartodb/issues/107
+          assert.ok(!res.headers.hasOwnProperty('cache-control'),
+            "Unexpected Cache-Control: " + res.headers['cache-control']);
           done();
         });
     });
@@ -1179,6 +1189,7 @@ suite('server', function() {
             method: 'DELETE'
         },{}, function(res) {
           assert.equal(res.statusCode, 404, res.statusCode + ': ' + res.body);
+          assert.ok(!res.headers.hasOwnProperty('cache-control'));
           done();
         });
     });
@@ -1210,6 +1221,7 @@ suite('server', function() {
         },{}, function(res) {
           // FIXME: should be 401 instead
           assert.equal(res.statusCode, 500, res.statusCode + ': ' + res.body);
+          assert.ok(!res.headers.hasOwnProperty('cache-control'));
           done();
         });
     });
@@ -1262,6 +1274,7 @@ suite('server', function() {
             method: 'DELETE'
         },{}, function(res) {
           assert.equal(res.statusCode, 404, res.statusCode + ': ' + res.body);
+          assert.ok(!res.headers.hasOwnProperty('cache-control'));
           done();
         });
     });