diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/__init__.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/__init__.py
index 286e7e196028..4afc0cd7a568 100644
--- a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/__init__.py
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/__init__.py
@@ -55,6 +55,7 @@
     from .application_gateway_ssl_certificate_py3 import ApplicationGatewaySslCertificate
     from .application_gateway_frontend_ip_configuration_py3 import ApplicationGatewayFrontendIPConfiguration
     from .application_gateway_frontend_port_py3 import ApplicationGatewayFrontendPort
+    from .application_gateway_custom_error_py3 import ApplicationGatewayCustomError
     from .application_gateway_http_listener_py3 import ApplicationGatewayHttpListener
     from .application_gateway_path_rule_py3 import ApplicationGatewayPathRule
     from .application_gateway_probe_health_response_match_py3 import ApplicationGatewayProbeHealthResponseMatch
@@ -63,6 +64,7 @@
     from .application_gateway_redirect_configuration_py3 import ApplicationGatewayRedirectConfiguration
     from .application_gateway_url_path_map_py3 import ApplicationGatewayUrlPathMap
     from .application_gateway_firewall_disabled_rule_group_py3 import ApplicationGatewayFirewallDisabledRuleGroup
+    from .application_gateway_firewall_exclusion_py3 import ApplicationGatewayFirewallExclusion
     from .application_gateway_web_application_firewall_configuration_py3 import ApplicationGatewayWebApplicationFirewallConfiguration
     from .application_gateway_autoscale_configuration_py3 import ApplicationGatewayAutoscaleConfiguration
     from .application_gateway_py3 import ApplicationGateway
@@ -322,6 +324,7 @@
     from .application_gateway_ssl_certificate import ApplicationGatewaySslCertificate
     from .application_gateway_frontend_ip_configuration import ApplicationGatewayFrontendIPConfiguration
     from .application_gateway_frontend_port import ApplicationGatewayFrontendPort
+    from .application_gateway_custom_error import ApplicationGatewayCustomError
     from .application_gateway_http_listener import ApplicationGatewayHttpListener
     from .application_gateway_path_rule import ApplicationGatewayPathRule
     from .application_gateway_probe_health_response_match import ApplicationGatewayProbeHealthResponseMatch
@@ -330,6 +333,7 @@
     from .application_gateway_redirect_configuration import ApplicationGatewayRedirectConfiguration
     from .application_gateway_url_path_map import ApplicationGatewayUrlPathMap
     from .application_gateway_firewall_disabled_rule_group import ApplicationGatewayFirewallDisabledRuleGroup
+    from .application_gateway_firewall_exclusion import ApplicationGatewayFirewallExclusion
     from .application_gateway_web_application_firewall_configuration import ApplicationGatewayWebApplicationFirewallConfiguration
     from .application_gateway_autoscale_configuration import ApplicationGatewayAutoscaleConfiguration
     from .application_gateway import ApplicationGateway
@@ -619,6 +623,7 @@
     ApplicationGatewaySslPolicyType,
     ApplicationGatewaySslPolicyName,
     ApplicationGatewaySslCipherSuite,
+    ApplicationGatewayCustomErrorStatusCode,
     ApplicationGatewayRequestRoutingRuleType,
     ApplicationGatewayRedirectType,
     ApplicationGatewayOperationalState,
@@ -735,6 +740,7 @@
     'ApplicationGatewaySslCertificate',
     'ApplicationGatewayFrontendIPConfiguration',
     'ApplicationGatewayFrontendPort',
+    'ApplicationGatewayCustomError',
     'ApplicationGatewayHttpListener',
     'ApplicationGatewayPathRule',
     'ApplicationGatewayProbeHealthResponseMatch',
@@ -743,6 +749,7 @@
     'ApplicationGatewayRedirectConfiguration',
     'ApplicationGatewayUrlPathMap',
     'ApplicationGatewayFirewallDisabledRuleGroup',
+    'ApplicationGatewayFirewallExclusion',
     'ApplicationGatewayWebApplicationFirewallConfiguration',
     'ApplicationGatewayAutoscaleConfiguration',
     'ApplicationGateway',
@@ -1031,6 +1038,7 @@
     'ApplicationGatewaySslPolicyType',
     'ApplicationGatewaySslPolicyName',
     'ApplicationGatewaySslCipherSuite',
+    'ApplicationGatewayCustomErrorStatusCode',
     'ApplicationGatewayRequestRoutingRuleType',
     'ApplicationGatewayRedirectType',
     'ApplicationGatewayOperationalState',
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway.py
index b0e63598a14d..78035663e327 100644
--- a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway.py
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway.py
@@ -105,6 +105,10 @@ class ApplicationGateway(Resource):
     :param provisioning_state: Provisioning state of the application gateway
      resource. Possible values are: 'Updating', 'Deleting', and 'Failed'.
     :type provisioning_state: str
+    :param custom_error_configuration: Custom error configurations of the
+     application gateway resource.
+    :type custom_error_configuration:
+     list[~azure.mgmt.network.v2018_08_01.models.ApplicationGatewayCustomError]
     :param etag: A unique read-only string that changes whenever the resource
      is updated.
     :type etag: str
@@ -147,6 +151,7 @@ class ApplicationGateway(Resource):
         'autoscale_configuration': {'key': 'properties.autoscaleConfiguration', 'type': 'ApplicationGatewayAutoscaleConfiguration'},
         'resource_guid': {'key': 'properties.resourceGuid', 'type': 'str'},
         'provisioning_state': {'key': 'properties.provisioningState', 'type': 'str'},
+        'custom_error_configuration': {'key': 'properties.customErrorConfiguration', 'type': '[ApplicationGatewayCustomError]'},
         'etag': {'key': 'etag', 'type': 'str'},
         'zones': {'key': 'zones', 'type': '[str]'},
     }
@@ -175,5 +180,6 @@ def __init__(self, **kwargs):
         self.autoscale_configuration = kwargs.get('autoscale_configuration', None)
         self.resource_guid = kwargs.get('resource_guid', None)
         self.provisioning_state = kwargs.get('provisioning_state', None)
+        self.custom_error_configuration = kwargs.get('custom_error_configuration', None)
         self.etag = kwargs.get('etag', None)
         self.zones = kwargs.get('zones', None)
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_custom_error.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_custom_error.py
new file mode 100644
index 000000000000..5ebdc06fa1dc
--- /dev/null
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_custom_error.py
@@ -0,0 +1,35 @@
+# coding=utf-8
+# --------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+#
+# Code generated by Microsoft (R) AutoRest Code Generator.
+# Changes may cause incorrect behavior and will be lost if the code is
+# regenerated.
+# --------------------------------------------------------------------------
+
+from msrest.serialization import Model
+
+
+class ApplicationGatewayCustomError(Model):
+    """Customer error of an application gateway.
+
+    :param status_code: Status code of the application gateway customer error.
+     Possible values include: '403', '502'
+    :type status_code: str or
+     ~azure.mgmt.network.v2018_08_01.models.ApplicationGatewayCustomErrorStatusCode
+    :param custom_error_page_url: Error page URL of the application gateway
+     customer error.
+    :type custom_error_page_url: str
+    """
+
+    _attribute_map = {
+        'status_code': {'key': 'statusCode', 'type': 'str'},
+        'custom_error_page_url': {'key': 'customErrorPageUrl', 'type': 'str'},
+    }
+
+    def __init__(self, **kwargs):
+        super(ApplicationGatewayCustomError, self).__init__(**kwargs)
+        self.status_code = kwargs.get('status_code', None)
+        self.custom_error_page_url = kwargs.get('custom_error_page_url', None)
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_custom_error_py3.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_custom_error_py3.py
new file mode 100644
index 000000000000..b739bbbe8917
--- /dev/null
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_custom_error_py3.py
@@ -0,0 +1,35 @@
+# coding=utf-8
+# --------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+#
+# Code generated by Microsoft (R) AutoRest Code Generator.
+# Changes may cause incorrect behavior and will be lost if the code is
+# regenerated.
+# --------------------------------------------------------------------------
+
+from msrest.serialization import Model
+
+
+class ApplicationGatewayCustomError(Model):
+    """Customer error of an application gateway.
+
+    :param status_code: Status code of the application gateway customer error.
+     Possible values include: '403', '502'
+    :type status_code: str or
+     ~azure.mgmt.network.v2018_08_01.models.ApplicationGatewayCustomErrorStatusCode
+    :param custom_error_page_url: Error page URL of the application gateway
+     customer error.
+    :type custom_error_page_url: str
+    """
+
+    _attribute_map = {
+        'status_code': {'key': 'statusCode', 'type': 'str'},
+        'custom_error_page_url': {'key': 'customErrorPageUrl', 'type': 'str'},
+    }
+
+    def __init__(self, *, status_code=None, custom_error_page_url: str=None, **kwargs) -> None:
+        super(ApplicationGatewayCustomError, self).__init__(**kwargs)
+        self.status_code = status_code
+        self.custom_error_page_url = custom_error_page_url
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_firewall_exclusion.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_firewall_exclusion.py
new file mode 100644
index 000000000000..93de07754023
--- /dev/null
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_firewall_exclusion.py
@@ -0,0 +1,48 @@
+# coding=utf-8
+# --------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+#
+# Code generated by Microsoft (R) AutoRest Code Generator.
+# Changes may cause incorrect behavior and will be lost if the code is
+# regenerated.
+# --------------------------------------------------------------------------
+
+from msrest.serialization import Model
+
+
+class ApplicationGatewayFirewallExclusion(Model):
+    """Allow to exclude some variable satisfy the condition for the WAF check.
+
+    All required parameters must be populated in order to send to Azure.
+
+    :param match_variable: Required. The variable to be excluded.
+    :type match_variable: str
+    :param selector_match_operator: Required. When matchVariable is a
+     collection, operate on the selector to specify which elements in the
+     collection this exclusion applies to.
+    :type selector_match_operator: str
+    :param selector: Required. When matchVariable is a collection, operator
+     used to specify which elements in the collection this exclusion applies
+     to.
+    :type selector: str
+    """
+
+    _validation = {
+        'match_variable': {'required': True},
+        'selector_match_operator': {'required': True},
+        'selector': {'required': True},
+    }
+
+    _attribute_map = {
+        'match_variable': {'key': 'matchVariable', 'type': 'str'},
+        'selector_match_operator': {'key': 'selectorMatchOperator', 'type': 'str'},
+        'selector': {'key': 'selector', 'type': 'str'},
+    }
+
+    def __init__(self, **kwargs):
+        super(ApplicationGatewayFirewallExclusion, self).__init__(**kwargs)
+        self.match_variable = kwargs.get('match_variable', None)
+        self.selector_match_operator = kwargs.get('selector_match_operator', None)
+        self.selector = kwargs.get('selector', None)
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_firewall_exclusion_py3.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_firewall_exclusion_py3.py
new file mode 100644
index 000000000000..75fa2cdbcf29
--- /dev/null
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_firewall_exclusion_py3.py
@@ -0,0 +1,48 @@
+# coding=utf-8
+# --------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+#
+# Code generated by Microsoft (R) AutoRest Code Generator.
+# Changes may cause incorrect behavior and will be lost if the code is
+# regenerated.
+# --------------------------------------------------------------------------
+
+from msrest.serialization import Model
+
+
+class ApplicationGatewayFirewallExclusion(Model):
+    """Allow to exclude some variable satisfy the condition for the WAF check.
+
+    All required parameters must be populated in order to send to Azure.
+
+    :param match_variable: Required. The variable to be excluded.
+    :type match_variable: str
+    :param selector_match_operator: Required. When matchVariable is a
+     collection, operate on the selector to specify which elements in the
+     collection this exclusion applies to.
+    :type selector_match_operator: str
+    :param selector: Required. When matchVariable is a collection, operator
+     used to specify which elements in the collection this exclusion applies
+     to.
+    :type selector: str
+    """
+
+    _validation = {
+        'match_variable': {'required': True},
+        'selector_match_operator': {'required': True},
+        'selector': {'required': True},
+    }
+
+    _attribute_map = {
+        'match_variable': {'key': 'matchVariable', 'type': 'str'},
+        'selector_match_operator': {'key': 'selectorMatchOperator', 'type': 'str'},
+        'selector': {'key': 'selector', 'type': 'str'},
+    }
+
+    def __init__(self, *, match_variable: str, selector_match_operator: str, selector: str, **kwargs) -> None:
+        super(ApplicationGatewayFirewallExclusion, self).__init__(**kwargs)
+        self.match_variable = match_variable
+        self.selector_match_operator = selector_match_operator
+        self.selector = selector
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_http_listener.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_http_listener.py
index 76292850ac5b..113fa54069b3 100644
--- a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_http_listener.py
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_http_listener.py
@@ -38,6 +38,10 @@ class ApplicationGatewayHttpListener(SubResource):
     :param provisioning_state: Provisioning state of the HTTP listener
      resource. Possible values are: 'Updating', 'Deleting', and 'Failed'.
     :type provisioning_state: str
+    :param custom_error_configuration: Custom error configurations of the HTTP
+     listener.
+    :type custom_error_configuration:
+     list[~azure.mgmt.network.v2018_08_01.models.ApplicationGatewayCustomError]
     :param name: Name of the HTTP listener that is unique within an
      Application Gateway.
     :type name: str
@@ -57,6 +61,7 @@ class ApplicationGatewayHttpListener(SubResource):
         'ssl_certificate': {'key': 'properties.sslCertificate', 'type': 'SubResource'},
         'require_server_name_indication': {'key': 'properties.requireServerNameIndication', 'type': 'bool'},
         'provisioning_state': {'key': 'properties.provisioningState', 'type': 'str'},
+        'custom_error_configuration': {'key': 'properties.customErrorConfiguration', 'type': '[ApplicationGatewayCustomError]'},
         'name': {'key': 'name', 'type': 'str'},
         'etag': {'key': 'etag', 'type': 'str'},
         'type': {'key': 'type', 'type': 'str'},
@@ -71,6 +76,7 @@ def __init__(self, **kwargs):
         self.ssl_certificate = kwargs.get('ssl_certificate', None)
         self.require_server_name_indication = kwargs.get('require_server_name_indication', None)
         self.provisioning_state = kwargs.get('provisioning_state', None)
+        self.custom_error_configuration = kwargs.get('custom_error_configuration', None)
         self.name = kwargs.get('name', None)
         self.etag = kwargs.get('etag', None)
         self.type = kwargs.get('type', None)
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_http_listener_py3.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_http_listener_py3.py
index 3961fb7637d7..f6db2b56bf4e 100644
--- a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_http_listener_py3.py
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_http_listener_py3.py
@@ -38,6 +38,10 @@ class ApplicationGatewayHttpListener(SubResource):
     :param provisioning_state: Provisioning state of the HTTP listener
      resource. Possible values are: 'Updating', 'Deleting', and 'Failed'.
     :type provisioning_state: str
+    :param custom_error_configuration: Custom error configurations of the HTTP
+     listener.
+    :type custom_error_configuration:
+     list[~azure.mgmt.network.v2018_08_01.models.ApplicationGatewayCustomError]
     :param name: Name of the HTTP listener that is unique within an
      Application Gateway.
     :type name: str
@@ -57,12 +61,13 @@ class ApplicationGatewayHttpListener(SubResource):
         'ssl_certificate': {'key': 'properties.sslCertificate', 'type': 'SubResource'},
         'require_server_name_indication': {'key': 'properties.requireServerNameIndication', 'type': 'bool'},
         'provisioning_state': {'key': 'properties.provisioningState', 'type': 'str'},
+        'custom_error_configuration': {'key': 'properties.customErrorConfiguration', 'type': '[ApplicationGatewayCustomError]'},
         'name': {'key': 'name', 'type': 'str'},
         'etag': {'key': 'etag', 'type': 'str'},
         'type': {'key': 'type', 'type': 'str'},
     }
 
-    def __init__(self, *, id: str=None, frontend_ip_configuration=None, frontend_port=None, protocol=None, host_name: str=None, ssl_certificate=None, require_server_name_indication: bool=None, provisioning_state: str=None, name: str=None, etag: str=None, type: str=None, **kwargs) -> None:
+    def __init__(self, *, id: str=None, frontend_ip_configuration=None, frontend_port=None, protocol=None, host_name: str=None, ssl_certificate=None, require_server_name_indication: bool=None, provisioning_state: str=None, custom_error_configuration=None, name: str=None, etag: str=None, type: str=None, **kwargs) -> None:
         super(ApplicationGatewayHttpListener, self).__init__(id=id, **kwargs)
         self.frontend_ip_configuration = frontend_ip_configuration
         self.frontend_port = frontend_port
@@ -71,6 +76,7 @@ def __init__(self, *, id: str=None, frontend_ip_configuration=None, frontend_por
         self.ssl_certificate = ssl_certificate
         self.require_server_name_indication = require_server_name_indication
         self.provisioning_state = provisioning_state
+        self.custom_error_configuration = custom_error_configuration
         self.name = name
         self.etag = etag
         self.type = type
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_py3.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_py3.py
index 894aae564b12..e414f9b322a6 100644
--- a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_py3.py
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_py3.py
@@ -105,6 +105,10 @@ class ApplicationGateway(Resource):
     :param provisioning_state: Provisioning state of the application gateway
      resource. Possible values are: 'Updating', 'Deleting', and 'Failed'.
     :type provisioning_state: str
+    :param custom_error_configuration: Custom error configurations of the
+     application gateway resource.
+    :type custom_error_configuration:
+     list[~azure.mgmt.network.v2018_08_01.models.ApplicationGatewayCustomError]
     :param etag: A unique read-only string that changes whenever the resource
      is updated.
     :type etag: str
@@ -147,11 +151,12 @@ class ApplicationGateway(Resource):
         'autoscale_configuration': {'key': 'properties.autoscaleConfiguration', 'type': 'ApplicationGatewayAutoscaleConfiguration'},
         'resource_guid': {'key': 'properties.resourceGuid', 'type': 'str'},
         'provisioning_state': {'key': 'properties.provisioningState', 'type': 'str'},
+        'custom_error_configuration': {'key': 'properties.customErrorConfiguration', 'type': '[ApplicationGatewayCustomError]'},
         'etag': {'key': 'etag', 'type': 'str'},
         'zones': {'key': 'zones', 'type': '[str]'},
     }
 
-    def __init__(self, *, id: str=None, location: str=None, tags=None, sku=None, ssl_policy=None, gateway_ip_configurations=None, authentication_certificates=None, trusted_root_certificates=None, ssl_certificates=None, frontend_ip_configurations=None, frontend_ports=None, probes=None, backend_address_pools=None, backend_http_settings_collection=None, http_listeners=None, url_path_maps=None, request_routing_rules=None, redirect_configurations=None, web_application_firewall_configuration=None, enable_http2: bool=None, enable_fips: bool=None, autoscale_configuration=None, resource_guid: str=None, provisioning_state: str=None, etag: str=None, zones=None, **kwargs) -> None:
+    def __init__(self, *, id: str=None, location: str=None, tags=None, sku=None, ssl_policy=None, gateway_ip_configurations=None, authentication_certificates=None, trusted_root_certificates=None, ssl_certificates=None, frontend_ip_configurations=None, frontend_ports=None, probes=None, backend_address_pools=None, backend_http_settings_collection=None, http_listeners=None, url_path_maps=None, request_routing_rules=None, redirect_configurations=None, web_application_firewall_configuration=None, enable_http2: bool=None, enable_fips: bool=None, autoscale_configuration=None, resource_guid: str=None, provisioning_state: str=None, custom_error_configuration=None, etag: str=None, zones=None, **kwargs) -> None:
         super(ApplicationGateway, self).__init__(id=id, location=location, tags=tags, **kwargs)
         self.sku = sku
         self.ssl_policy = ssl_policy
@@ -175,5 +180,6 @@ def __init__(self, *, id: str=None, location: str=None, tags=None, sku=None, ssl
         self.autoscale_configuration = autoscale_configuration
         self.resource_guid = resource_guid
         self.provisioning_state = provisioning_state
+        self.custom_error_configuration = custom_error_configuration
         self.etag = etag
         self.zones = zones
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_web_application_firewall_configuration.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_web_application_firewall_configuration.py
index 4658d15fc1cb..155dc452de99 100644
--- a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_web_application_firewall_configuration.py
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_web_application_firewall_configuration.py
@@ -36,6 +36,14 @@ class ApplicationGatewayWebApplicationFirewallConfiguration(Model):
     :type request_body_check: bool
     :param max_request_body_size: Maxium request body size for WAF.
     :type max_request_body_size: int
+    :param max_request_body_size_in_kb: Maxium request body size in Kb for
+     WAF.
+    :type max_request_body_size_in_kb: int
+    :param file_upload_limit_in_mb: Maxium file upload size in Mb for WAF.
+    :type file_upload_limit_in_mb: int
+    :param exclusions: The exclusion list.
+    :type exclusions:
+     list[~azure.mgmt.network.v2018_08_01.models.ApplicationGatewayFirewallExclusion]
     """
 
     _validation = {
@@ -44,6 +52,8 @@ class ApplicationGatewayWebApplicationFirewallConfiguration(Model):
         'rule_set_type': {'required': True},
         'rule_set_version': {'required': True},
         'max_request_body_size': {'maximum': 128, 'minimum': 8},
+        'max_request_body_size_in_kb': {'maximum': 128, 'minimum': 8},
+        'file_upload_limit_in_mb': {'maximum': 500, 'minimum': 0},
     }
 
     _attribute_map = {
@@ -54,6 +64,9 @@ class ApplicationGatewayWebApplicationFirewallConfiguration(Model):
         'disabled_rule_groups': {'key': 'disabledRuleGroups', 'type': '[ApplicationGatewayFirewallDisabledRuleGroup]'},
         'request_body_check': {'key': 'requestBodyCheck', 'type': 'bool'},
         'max_request_body_size': {'key': 'maxRequestBodySize', 'type': 'int'},
+        'max_request_body_size_in_kb': {'key': 'maxRequestBodySizeInKb', 'type': 'int'},
+        'file_upload_limit_in_mb': {'key': 'fileUploadLimitInMb', 'type': 'int'},
+        'exclusions': {'key': 'exclusions', 'type': '[ApplicationGatewayFirewallExclusion]'},
     }
 
     def __init__(self, **kwargs):
@@ -65,3 +78,6 @@ def __init__(self, **kwargs):
         self.disabled_rule_groups = kwargs.get('disabled_rule_groups', None)
         self.request_body_check = kwargs.get('request_body_check', None)
         self.max_request_body_size = kwargs.get('max_request_body_size', None)
+        self.max_request_body_size_in_kb = kwargs.get('max_request_body_size_in_kb', None)
+        self.file_upload_limit_in_mb = kwargs.get('file_upload_limit_in_mb', None)
+        self.exclusions = kwargs.get('exclusions', None)
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_web_application_firewall_configuration_py3.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_web_application_firewall_configuration_py3.py
index 55cd31b00be4..fd26aa3a5b01 100644
--- a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_web_application_firewall_configuration_py3.py
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/application_gateway_web_application_firewall_configuration_py3.py
@@ -36,6 +36,14 @@ class ApplicationGatewayWebApplicationFirewallConfiguration(Model):
     :type request_body_check: bool
     :param max_request_body_size: Maxium request body size for WAF.
     :type max_request_body_size: int
+    :param max_request_body_size_in_kb: Maxium request body size in Kb for
+     WAF.
+    :type max_request_body_size_in_kb: int
+    :param file_upload_limit_in_mb: Maxium file upload size in Mb for WAF.
+    :type file_upload_limit_in_mb: int
+    :param exclusions: The exclusion list.
+    :type exclusions:
+     list[~azure.mgmt.network.v2018_08_01.models.ApplicationGatewayFirewallExclusion]
     """
 
     _validation = {
@@ -44,6 +52,8 @@ class ApplicationGatewayWebApplicationFirewallConfiguration(Model):
         'rule_set_type': {'required': True},
         'rule_set_version': {'required': True},
         'max_request_body_size': {'maximum': 128, 'minimum': 8},
+        'max_request_body_size_in_kb': {'maximum': 128, 'minimum': 8},
+        'file_upload_limit_in_mb': {'maximum': 500, 'minimum': 0},
     }
 
     _attribute_map = {
@@ -54,9 +64,12 @@ class ApplicationGatewayWebApplicationFirewallConfiguration(Model):
         'disabled_rule_groups': {'key': 'disabledRuleGroups', 'type': '[ApplicationGatewayFirewallDisabledRuleGroup]'},
         'request_body_check': {'key': 'requestBodyCheck', 'type': 'bool'},
         'max_request_body_size': {'key': 'maxRequestBodySize', 'type': 'int'},
+        'max_request_body_size_in_kb': {'key': 'maxRequestBodySizeInKb', 'type': 'int'},
+        'file_upload_limit_in_mb': {'key': 'fileUploadLimitInMb', 'type': 'int'},
+        'exclusions': {'key': 'exclusions', 'type': '[ApplicationGatewayFirewallExclusion]'},
     }
 
-    def __init__(self, *, enabled: bool, firewall_mode, rule_set_type: str, rule_set_version: str, disabled_rule_groups=None, request_body_check: bool=None, max_request_body_size: int=None, **kwargs) -> None:
+    def __init__(self, *, enabled: bool, firewall_mode, rule_set_type: str, rule_set_version: str, disabled_rule_groups=None, request_body_check: bool=None, max_request_body_size: int=None, max_request_body_size_in_kb: int=None, file_upload_limit_in_mb: int=None, exclusions=None, **kwargs) -> None:
         super(ApplicationGatewayWebApplicationFirewallConfiguration, self).__init__(**kwargs)
         self.enabled = enabled
         self.firewall_mode = firewall_mode
@@ -65,3 +78,6 @@ def __init__(self, *, enabled: bool, firewall_mode, rule_set_type: str, rule_set
         self.disabled_rule_groups = disabled_rule_groups
         self.request_body_check = request_body_check
         self.max_request_body_size = max_request_body_size
+        self.max_request_body_size_in_kb = max_request_body_size_in_kb
+        self.file_upload_limit_in_mb = file_upload_limit_in_mb
+        self.exclusions = exclusions
diff --git a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/network_management_client_enums.py b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/network_management_client_enums.py
index 8bc0b8aaec16..ac671a6caeec 100644
--- a/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/network_management_client_enums.py
+++ b/azure-mgmt-network/azure/mgmt/network/v2018_08_01/models/network_management_client_enums.py
@@ -154,6 +154,12 @@ class ApplicationGatewaySslCipherSuite(str, Enum):
     tls_rsa_with_3_des_ede_cbc_sha = "TLS_RSA_WITH_3DES_EDE_CBC_SHA"
 
 
+class ApplicationGatewayCustomErrorStatusCode(str, Enum):
+
+    four_zero_three = "403"
+    five_zero_two = "502"
+
+
 class ApplicationGatewayRequestRoutingRuleType(str, Enum):
 
     basic = "Basic"