diff --git a/lib/proxy.js b/lib/proxy.js
index 614aa59..e1e7f05 100644
--- a/lib/proxy.js
+++ b/lib/proxy.js
@@ -33,8 +33,12 @@ module.exports = function(options) {
     originalQuery: false
   });
 
+  options.headersToPreserveInCache = 
+    _.map(_.union(options.headersToPreserveInCache, headersToPreserveInCache), (h) => h.toLowerCase());  
+
   return function(req, res, next) {
     var method = req.method.toUpperCase();
+    var force = req.query.force || false;
 
     // Allow for a global cache to be specified on the parent Express app
     if (!options.cache) {
@@ -56,7 +60,7 @@ module.exports = function(options) {
       }
     }
 
-    if (method.toUpperCase() === 'GET' && options.cache && options.cacheMaxAge > 0) {
+    if (method.toUpperCase() === 'GET' && options.cache && options.cacheMaxAge > 0 && !force) {
       if (!options.cache) return next(new Error('No cache provider configured'));
 
       return proxyViaCache(req, res, next);
@@ -177,7 +181,7 @@ module.exports = function(options) {
         }
 
         // Store the headers as a separate cache entry
-        var headersToKeep = _.pick(resp.headers, headersToPreserveInCache);
+        var headersToKeep = _.pick(resp.headers, options.headersToPreserveInCache);
 
         if (_.isArray(options.transforms)) {
           apiRequest = applyTransforms(apiRequest, options.transforms, headersToKeep);