diff --git a/botocore/__init__.py b/botocore/__init__.py
index 7f10ee428f..4c6912ea52 100644
--- a/botocore/__init__.py
+++ b/botocore/__init__.py
@@ -23,7 +23,7 @@
 import re
 import logging
 
-__version__ = '0.26.0'
+__version__ = '0.27.0'
 
 
 class NullHandler(logging.Handler):
diff --git a/botocore/data/aws/s3.json b/botocore/data/aws/s3.json
index 4c5cf3fdfd..11f7b856e3 100644
--- a/botocore/data/aws/s3.json
+++ b/botocore/data/aws/s3.json
@@ -318,7 +318,8 @@
                         "type": "string",
                         "location": "header",
                         "location_name": "x-amz-website-redirect-location",
-                        "documentation": "If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata."
+                        "documentation": "If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata.",
+                        "no_paramfile": true
                     }
                 }
             },
@@ -604,7 +605,8 @@
                         "type": "string",
                         "location": "header",
                         "location_name": "x-amz-website-redirect-location",
-                        "documentation": "If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata."
+                        "documentation": "If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata.",
+                        "no_paramfile": true
                     }
                 }
             },
@@ -3816,7 +3818,8 @@
                         "type": "string",
                         "location": "header",
                         "location_name": "x-amz-website-redirect-location",
-                        "documentation": "If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata."
+                        "documentation": "If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata.",
+                        "no_paramfile": true
                     }
                 }
             },
diff --git a/botocore/data/aws/support.json b/botocore/data/aws/support.json
index 5f21109256..3298677d41 100644
--- a/botocore/data/aws/support.json
+++ b/botocore/data/aws/support.json
@@ -99,8 +99,7 @@
                         "shape_name": "ServiceCode",
                         "type": "string",
                         "pattern": "[0-9a-z\\-_]+",
-                        "documentation": "\n    <p>Code for the AWS service returned by the call to <a href=\"http://docs.aws.amazon.com/awssupport/latest/APIReference/API_DescribeServices.html\" title=\"DescribeServices\">DescribeServices</a>.</p>\n  ",
-                        "required": true
+                        "documentation": "\n    <p>Code for the AWS service returned by the call to <a href=\"http://docs.aws.amazon.com/awssupport/latest/APIReference/API_DescribeServices.html\" title=\"DescribeServices\">DescribeServices</a>.</p>\n  "
                     },
                     "severityCode": {
                         "shape_name": "SeverityCode",
@@ -110,8 +109,7 @@
                     "categoryCode": {
                         "shape_name": "CategoryCode",
                         "type": "string",
-                        "documentation": "\n    <p>Specifies the category of problem for the AWS Support case. </p>\n  ",
-                        "required": true
+                        "documentation": "\n    <p>Specifies the category of problem for the AWS Support case. </p>\n  "
                     },
                     "communicationBody": {
                         "shape_name": "CommunicationBody",
diff --git a/botocore/parameters.py b/botocore/parameters.py
index c060407686..e8f97d27d1 100644
--- a/botocore/parameters.py
+++ b/botocore/parameters.py
@@ -374,9 +374,17 @@ def build_parameter_query(self, value, built_params, label=''):
             else:
                 label = self.get_label()
             label = '%s.%s' % (label, 'member')
-        for i, v in enumerate(value, 1):
-            member_type.build_parameter_query(v, built_params,
-                                              '%s.%d' % (label, i))
+        if len(value) == 0 and self.required:
+            # If the parameter is required and an empty list is
+            # provided as a value, we should insert a parameter
+            # into the dictionary with the base name of the
+            # parameter and a value of the empty string. See
+            # ELB SetLoadBalancerPoliciesForBackendServer for example.
+            built_params[label.split('.')[0]] = ''
+        else:
+            for i, v in enumerate(value, 1):
+                member_type.build_parameter_query(v, built_params,
+                                                  '%s.%d' % (label, i))
 
     def build_parameter_json(self, value, built_params, label=''):
         value = self.validate(value)
@@ -415,13 +423,21 @@ def _handle_subtypes(self):
 
     def build_parameter_query(self, value, built_params, label=''):
         label = self.get_label()
+        if not self.flattened:
+            label = '%s.entry' % label
         key_type = self.keys
         member_type = self.members
         for i, v in enumerate(value, 1):
-            built_params['%s.%d.%s' % (label, i, key_type.xmlname)] = v
+            key_name = key_type.xmlname
+            if not key_name:
+                key_name = 'key'
+            built_params['%s.%d.%s' % (label, i, key_name)] = v
+            member_name = member_type.xmlname
+            if not member_name:
+                member_name = 'value'
             member_type.build_parameter_query(
                 value[v], built_params,
-                '%s.%d.%s' % (label, i, member_type.xmlname))
+                '%s.%d.%s' % (label, i, member_name))
 
     def build_parameter_json(self, value, built_params, label=''):
         label = self.get_label()
diff --git a/services/s3.extra.json b/services/s3.extra.json
index 78ed31abd0..86d3310942 100644
--- a/services/s3.extra.json
+++ b/services/s3.extra.json
@@ -40,6 +40,33 @@
             }
           }
         }
+      },
+      "PutObject": {
+          "input": {
+              "members": {
+                  "WebsiteRedirectLocation": {
+                      "no_paramfile": true
+                  }
+              }
+          }
+      },
+      "CopyObject": {
+          "input": {
+              "members": {
+                  "WebsiteRedirectLocation": {
+                      "no_paramfile": true
+                  }
+              }
+          }
+      },
+      "CreateMultipartUpload": {
+          "input": {
+              "members": {
+                  "WebsiteRedirectLocation": {
+                      "no_paramfile": true
+                  }
+              }
+          }
       }
     },
   "pagination": {
diff --git a/services/support.json b/services/support.json
index 323c5a203c..73bade39b1 100644
--- a/services/support.json
+++ b/services/support.json
@@ -99,8 +99,7 @@
             "shape_name": "ServiceCode",
             "type": "string",
             "pattern": "[0-9a-z\\-_]+",
-            "documentation": "\n    <p>Code for the AWS service returned by the call to <a href=\"http://docs.aws.amazon.com/awssupport/latest/APIReference/API_DescribeServices.html\" title=\"DescribeServices\">DescribeServices</a>.</p>\n  ",
-            "required": true
+            "documentation": "\n    <p>Code for the AWS service returned by the call to <a href=\"http://docs.aws.amazon.com/awssupport/latest/APIReference/API_DescribeServices.html\" title=\"DescribeServices\">DescribeServices</a>.</p>\n  "
           },
           "severityCode": {
             "shape_name": "SeverityCode",
@@ -110,8 +109,7 @@
           "categoryCode": {
             "shape_name": "CategoryCode",
             "type": "string",
-            "documentation": "\n    <p>Specifies the category of problem for the AWS Support case. </p>\n  ",
-            "required": true
+            "documentation": "\n    <p>Specifies the category of problem for the AWS Support case. </p>\n  "
           },
           "communicationBody": {
             "shape_name": "CommunicationBody",
diff --git a/setup.py b/setup.py
index fa3146b912..d3eb98efb1 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@
 
 
 requires = ['six>=1.1.0',
-            'jmespath==0.1.0',
+            'jmespath==0.2.0',
             'python-dateutil>=2.1']
 
 
diff --git a/tests/unit/test_elb_operations.py b/tests/unit/test_elb_operations.py
index 2a53a414d0..43ae60cc14 100644
--- a/tests/unit/test_elb_operations.py
+++ b/tests/unit/test_elb_operations.py
@@ -76,6 +76,27 @@ def test_register_instances_with_load_balancer(self):
                   'Instances.member.2.InstanceId': 'i-87654321'}
         self.assertEqual(params, result)
 
+    def test_set_lb_policies_for_backend_server(self):
+        op = self.elb.get_operation('SetLoadBalancerPoliciesForBackendServer')
+        params = op.build_parameters(load_balancer_name='foobar',
+                                     instance_port=443,
+                                     policy_names=['fie', 'baz'])
+        result = {'LoadBalancerName': 'foobar',
+                  'InstancePort': '443',
+                  'PolicyNames.member.1': 'fie',
+                  'PolicyNames.member.2': 'baz'}
+        self.assertEqual(params, result)
+
+    def test_clear_lb_policies_for_backend_server(self):
+        op = self.elb.get_operation('SetLoadBalancerPoliciesForBackendServer')
+        params = op.build_parameters(load_balancer_name='foobar',
+                                     instance_port=443,
+                                     policy_names=[])
+        result = {'LoadBalancerName': 'foobar',
+                  'InstancePort': '443',
+                  'PolicyNames': ''}
+        self.assertEqual(params, result)
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tests/unit/test_sns_operations.py b/tests/unit/test_sns_operations.py
index 50cae127ec..d7cf3b4135 100644
--- a/tests/unit/test_sns_operations.py
+++ b/tests/unit/test_sns_operations.py
@@ -22,8 +22,9 @@
 #
 import unittest
 
-from mock import Mock, sentinel
+from mock import Mock
 
+from botocore.compat import OrderedDict
 import botocore.session
 
 
@@ -74,6 +75,21 @@ def test_sns_post_send_event_is_invoked(self):
         self.assertEqual(calls[0]['http_response'], self.http_response)
         self.assertEqual(calls[0]['parsed'], self.parsed_response)
 
+    def test_create_platform_application(self):
+        op = self.sns.get_operation('CreatePlatformApplication')
+        attributes = OrderedDict()
+        attributes['PlatformCredential'] = 'foo'
+        attributes['PlatformPrincipal'] = 'bar'
+        params = op.build_parameters(name='gcmpushapp', platform='GCM',
+                                     attributes=attributes)
+        result = {'Name': 'gcmpushapp',
+                  'Platform': 'GCM',
+                  'Attributes.entry.1.key': 'PlatformCredential',
+                  'Attributes.entry.1.value': 'foo',
+                  'Attributes.entry.2.key': 'PlatformPrincipal',
+                  'Attributes.entry.2.value': 'bar'}
+        self.assertEqual(params, result)
+
 
 if __name__ == "__main__":
     unittest.main()