diff --git a/Nancy.LightningCache/CacheKey/DefaultCacheKeyGenerator.cs b/Nancy.LightningCache/CacheKey/DefaultCacheKeyGenerator.cs
index 5661531..07eb36e 100644
--- a/Nancy.LightningCache/CacheKey/DefaultCacheKeyGenerator.cs
+++ b/Nancy.LightningCache/CacheKey/DefaultCacheKeyGenerator.cs
@@ -43,7 +43,7 @@ public string Get(Request request)
                 }
             }
 
-            var removeParamKeys = query.Where(a => !_varyParams.Contains(a.Key.Replace("?", "").ToLower())).Select(a => a.Key).ToArray();
+            var removeParamKeys = query.Where(a => !_varyParams.Contains(a.Key.Replace("?", ""), StringComparer.OrdinalIgnoreCase)).Select(a => a.Key).ToArray();
             foreach (var removeParamKey in removeParamKeys)
                 query.Remove(removeParamKey);
 
diff --git a/Nancy.LightningCache/CacheStore/DiskCacheStore.cs b/Nancy.LightningCache/CacheStore/DiskCacheStore.cs
index 5db70a5..31b5100 100644
--- a/Nancy.LightningCache/CacheStore/DiskCacheStore.cs
+++ b/Nancy.LightningCache/CacheStore/DiskCacheStore.cs
@@ -73,7 +73,7 @@ public DiskCacheStore(string cacheDirectory)
         private static string Hash(string str)
         {
             var hasher = SHA256.Create();
-            var inputBytes = Encoding.ASCII.GetBytes(str);
+            var inputBytes = Encoding.ASCII.GetBytes(str.ToLower());
             var hashBytes = hasher.ComputeHash(inputBytes);
 
             var sb = new StringBuilder();
diff --git a/Nancy.LightningCache/CacheStore/WebCacheStore.cs b/Nancy.LightningCache/CacheStore/WebCacheStore.cs
index 14b51e4..c33ef1e 100644
--- a/Nancy.LightningCache/CacheStore/WebCacheStore.cs
+++ b/Nancy.LightningCache/CacheStore/WebCacheStore.cs
@@ -19,7 +19,7 @@ public CachedResponse Get(string key)
             if (_cache == null)
                 return null;
 
-            var response = _cache.Get(key) as SerializableResponse;
+            var response = _cache.Get(key.ToLower()) as SerializableResponse;
 
             if (response == null)
                 return null;
@@ -34,7 +34,7 @@ public void Remove(string key)
             if (_cache == null)
                 return;
 
-            _cache.Remove(key);
+            _cache.Remove(key.ToLower());
         }
 
         public void Set(string key, NancyContext context, DateTime absoluteExpiration)
@@ -44,7 +44,7 @@ public void Set(string key, NancyContext context, DateTime absoluteExpiration)
             if(_cache == null)
                 return;
 
-            _cache[key] = new SerializableResponse(context.Response, absoluteExpiration);
+            _cache[key.ToLower()] = new SerializableResponse(context.Response, absoluteExpiration);
 
         }
         private static readonly object Lock = new object();