Clean and regen docs (#401)

diff --git a/docs/dyn/compute_alpha.backendServices.html b/docs/dyn/compute_alpha.backendServices.html
index 259859a..3065a16 100644
--- a/docs/dyn/compute_alpha.backendServices.html
+++ b/docs/dyn/compute_alpha.backendServices.html
@@ -75,6 +75,9 @@
 <h1><a href="compute_alpha.html">Compute Engine API</a> . <a href="compute_alpha.backendServices.html">backendServices</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
+  <code><a href="#addSignedUrlKey">addSignedUrlKey(project, backendService, body, requestId=None)</a></code></p>
+<p class="firstline">Adds the given Signed URL Key to the specified backend service.</p>
+<p class="toc_element">
   <code><a href="#aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
 <p class="firstline">Retrieves the list of all BackendService resources, regional and global, available to the specified project.</p>
 <p class="toc_element">
@@ -84,6 +87,9 @@
   <code><a href="#delete">delete(project, backendService, requestId=None)</a></code></p>
 <p class="firstline">Deletes the specified BackendService resource.</p>
 <p class="toc_element">
+  <code><a href="#deleteSignedUrlKey">deleteSignedUrlKey(project, backendService, keyName, requestId=None)</a></code></p>
+<p class="firstline">Deletes the given Signed URL Key from the specified backend service.</p>
+<p class="toc_element">
   <code><a href="#get">get(project, backendService)</a></code></p>
 <p class="firstline">Returns the specified BackendService resource. Get a list of available backend services by making a list() request.</p>
 <p class="toc_element">
@@ -102,6 +108,9 @@
   <code><a href="#patch">patch(project, backendService, body, requestId=None)</a></code></p>
 <p class="firstline">Patches the specified BackendService resource with the data included in the request. There are several restrictions and guidelines to keep in mind when updating a backend service. Read  Restrictions and Guidelines for more information. This method supports patch semantics.</p>
 <p class="toc_element">
+  <code><a href="#setSecurityPolicy">setSecurityPolicy(project, backendService, body, requestId=None)</a></code></p>
+<p class="firstline">Sets the security policy for the specified backend service.</p>
+<p class="toc_element">
   <code><a href="#testIamPermissions">testIamPermissions(project, resource, body)</a></code></p>
 <p class="firstline">Returns permissions that a caller has on the specified resource.</p>
 <p class="toc_element">
@@ -109,6 +118,73 @@
 <p class="firstline">Updates the specified BackendService resource with the data included in the request. There are several restrictions and guidelines to keep in mind when updating a backend service. Read  Restrictions and Guidelines for more information.</p>
 <h3>Method Details</h3>
 <div class="method">
+    <code class="details" id="addSignedUrlKey">addSignedUrlKey(project, backendService, body, requestId=None)</code>
+  <pre>Adds the given Signed URL Key to the specified backend service.
+
+Args:
+  project: string, Project ID for this request. (required)
+  backendService: string, Name of the BackendService resource to which the Signed URL Key should be added. The name should conform to RFC1035. (required)
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{ # Represents a customer-supplied Signing Key used by Cloud CDN Signed URLs
+    "keyName": "A String", # Name of the key. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression [a-z]([-a-z0-9]*[a-z0-9])? which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.
+    "keyValue": "A String", # 128-bit key value used for signing the URL. The key value must be a valid RFC 4648 Section 5 base64url encoded string.
+  }
+
+  requestId: string, begin_interface: MixerMutationRequestBuilder Request ID to support idempotency.
+
+Returns:
+  An object of the form:
+
+    { # An Operation resource, used to manage asynchronous API requests.
+    "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
+    "clientOperationId": "A String", # [Output Only] Reserved for future use.
+    "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
+    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only available when performing per-zone operations.
+    "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
+    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
+    "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
+      {
+        "message": "A String", # [Output Only] A human-readable description of the warning code.
+        "code": "A String", # [Output Only] A warning code, if applicable. For example, Compute Engine returns NO_RESULTS_ON_PAGE if there are no results in the response.
+        "data": [ # [Output Only] Metadata about this warning in key: value format. For example:
+            # "data": [ { "key": "scope", "value": "zones/us-east1-d" }
+          {
+            "value": "A String", # [Output Only] A warning data value corresponding to the key.
+            "key": "A String", # [Output Only] A key that provides more detail on the warning being returned. For example, for warnings where there are no results in a list request for a particular zone, this key might be scope and the key value might be the zone name. Other examples might be a key indicating a deprecated resource and a suggested replacement, or a warning about invalid network settings (for example, if an instance attempts to perform IP forwarding but is not enabled for IP forwarding).
+          },
+        ],
+      },
+    ],
+    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
+    "name": "A String", # [Output Only] Name of the resource.
+    "region": "A String", # [Output Only] The URL of the region where the operation resides. Only available when performing regional operations.
+    "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
+      "errors": [ # [Output Only] The array of errors encountered while processing this operation.
+        {
+          "message": "A String", # [Output Only] An optional, human-readable error message.
+          "code": "A String", # [Output Only] The error type identifier for this error.
+          "location": "A String", # [Output Only] Indicates the field in the request that caused the error. This property is optional.
+        },
+      ],
+    },
+    "endTime": "A String", # [Output Only] The time that this operation was completed. This value is in RFC3339 text format.
+    "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
+    "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. For operations related to creating a snapshot, this points to the persistent disk that the snapshot was created from.
+  }</pre>
+</div>
+
+<div class="method">
     <code class="details" id="aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
   <pre>Retrieves the list of all BackendService resources, regional and global, available to the specified project.
 
@@ -154,6 +230,11 @@
               "connectionDraining": { # Message containing connection draining configuration.
                 "drainingTimeoutSec": 42, # Time for which instance will be drained (not accept new connections, but still work to finish started).
               },
+              "failoverRatio": 3.14, # The value of the field must be in [0, 1]. If set, 'backends[].failover' must be set. They together define the fallback behavior of the primary backend: if the ratio of the healthy VMs in the primary backend is at or below this number, traffic arriving at the load-balanced IP will be directed to the failover backend.
+                  #
+                  # In case where 'failoverRatio' is not set or all the VMs in the backup backend are unhealthy, the traffic will be directed back to the primary backend in the "force" mode, where traffic will be spread to the healthy VMs with the best effort, or to all VMs when no VM is healthy.
+                  #
+                  # This field is only used with l4 load balancing.
               "protocol": "A String", # The protocol this BackendService uses to communicate with backends.
                   #
                   # Possible values are HTTP, HTTPS, TCP, and SSL. The default is HTTP.
@@ -178,7 +259,7 @@
                 "signedUrlKeyNames": [ # [Output Only] Names of the keys currently configured for Cloud CDN Signed URL on this backend service.
                   "A String",
                 ],
-                "signedUrlTtlSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
+                "signedUrlCacheMaxAgeSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
                 "cacheKeyPolicy": { # Message containing what to include in the cache key for a request for Cloud CDN. # The CacheKeyPolicy for this CdnPolicy.
                   "includeQueryString": True or False, # If true, include query string parameters in the cache key according to query_string_whitelist and query_string_blacklist. If neither is set, the entire query string will be included. If false, the query string will be excluded from the cache key entirely.
                   "includeHost": True or False, # If true, requests to different hosts will be cached separately.
@@ -212,7 +293,7 @@
                       #
                       # This cannot be used for internal load balancing.
                   "failover": True or False, # This field designates whether this is a failover backend. More than one failover backend can be configured for a given BackendService.
-                  "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle.This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
+                  "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
                       #
                       # This cannot be used for internal load balancing.
                   "maxConnectionsPerInstance": 42, # The max number of simultaneous connections that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either CONNECTION or UTILIZATION balancing modes. For CONNECTION mode, either maxConnections or maxConnectionsPerInstance must be set.
@@ -236,7 +317,7 @@
                 "oauth2ClientId": "A String",
                 "enabled": True or False,
                 "oauth2ClientSecret": "A String",
-                "oauth2ClientSecretSha256": "A String",
+                "oauth2ClientSecretSha256": "A String", # [Output Only] SHA256 hash value for the field oauth2_client_secret above.
               },
               "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
               "customRequestHeaders": [ # Headers that the HTTP/S load balancer should add to proxied requests.
@@ -336,6 +417,66 @@
 </div>
 
 <div class="method">
+    <code class="details" id="deleteSignedUrlKey">deleteSignedUrlKey(project, backendService, keyName, requestId=None)</code>
+  <pre>Deletes the given Signed URL Key from the specified backend service.
+
+Args:
+  project: string, Project ID for this request. (required)
+  backendService: string, Name of the BackendService resource to which the Signed URL Key should be added. The name should conform to RFC1035. (required)
+  keyName: string, The name of the Signed URL Key to delete. (required)
+  requestId: string, begin_interface: MixerMutationRequestBuilder Request ID to support idempotency.
+
+Returns:
+  An object of the form:
+
+    { # An Operation resource, used to manage asynchronous API requests.
+    "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
+    "clientOperationId": "A String", # [Output Only] Reserved for future use.
+    "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
+    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only available when performing per-zone operations.
+    "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
+    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
+    "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
+      {
+        "message": "A String", # [Output Only] A human-readable description of the warning code.
+        "code": "A String", # [Output Only] A warning code, if applicable. For example, Compute Engine returns NO_RESULTS_ON_PAGE if there are no results in the response.
+        "data": [ # [Output Only] Metadata about this warning in key: value format. For example:
+            # "data": [ { "key": "scope", "value": "zones/us-east1-d" }
+          {
+            "value": "A String", # [Output Only] A warning data value corresponding to the key.
+            "key": "A String", # [Output Only] A key that provides more detail on the warning being returned. For example, for warnings where there are no results in a list request for a particular zone, this key might be scope and the key value might be the zone name. Other examples might be a key indicating a deprecated resource and a suggested replacement, or a warning about invalid network settings (for example, if an instance attempts to perform IP forwarding but is not enabled for IP forwarding).
+          },
+        ],
+      },
+    ],
+    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
+    "name": "A String", # [Output Only] Name of the resource.
+    "region": "A String", # [Output Only] The URL of the region where the operation resides. Only available when performing regional operations.
+    "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
+      "errors": [ # [Output Only] The array of errors encountered while processing this operation.
+        {
+          "message": "A String", # [Output Only] An optional, human-readable error message.
+          "code": "A String", # [Output Only] The error type identifier for this error.
+          "location": "A String", # [Output Only] Indicates the field in the request that caused the error. This property is optional.
+        },
+      ],
+    },
+    "endTime": "A String", # [Output Only] The time that this operation was completed. This value is in RFC3339 text format.
+    "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
+    "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. For operations related to creating a snapshot, this points to the persistent disk that the snapshot was created from.
+  }</pre>
+</div>
+
+<div class="method">
     <code class="details" id="get">get(project, backendService)</code>
   <pre>Returns the specified BackendService resource. Get a list of available backend services by making a list() request.
 
@@ -350,6 +491,11 @@
       "connectionDraining": { # Message containing connection draining configuration.
         "drainingTimeoutSec": 42, # Time for which instance will be drained (not accept new connections, but still work to finish started).
       },
+      "failoverRatio": 3.14, # The value of the field must be in [0, 1]. If set, 'backends[].failover' must be set. They together define the fallback behavior of the primary backend: if the ratio of the healthy VMs in the primary backend is at or below this number, traffic arriving at the load-balanced IP will be directed to the failover backend.
+          #
+          # In case where 'failoverRatio' is not set or all the VMs in the backup backend are unhealthy, the traffic will be directed back to the primary backend in the "force" mode, where traffic will be spread to the healthy VMs with the best effort, or to all VMs when no VM is healthy.
+          #
+          # This field is only used with l4 load balancing.
       "protocol": "A String", # The protocol this BackendService uses to communicate with backends.
           #
           # Possible values are HTTP, HTTPS, TCP, and SSL. The default is HTTP.
@@ -374,7 +520,7 @@
         "signedUrlKeyNames": [ # [Output Only] Names of the keys currently configured for Cloud CDN Signed URL on this backend service.
           "A String",
         ],
-        "signedUrlTtlSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
+        "signedUrlCacheMaxAgeSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
         "cacheKeyPolicy": { # Message containing what to include in the cache key for a request for Cloud CDN. # The CacheKeyPolicy for this CdnPolicy.
           "includeQueryString": True or False, # If true, include query string parameters in the cache key according to query_string_whitelist and query_string_blacklist. If neither is set, the entire query string will be included. If false, the query string will be excluded from the cache key entirely.
           "includeHost": True or False, # If true, requests to different hosts will be cached separately.
@@ -408,7 +554,7 @@
               #
               # This cannot be used for internal load balancing.
           "failover": True or False, # This field designates whether this is a failover backend. More than one failover backend can be configured for a given BackendService.
-          "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle.This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
+          "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
               #
               # This cannot be used for internal load balancing.
           "maxConnectionsPerInstance": 42, # The max number of simultaneous connections that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either CONNECTION or UTILIZATION balancing modes. For CONNECTION mode, either maxConnections or maxConnectionsPerInstance must be set.
@@ -432,7 +578,7 @@
         "oauth2ClientId": "A String",
         "enabled": True or False,
         "oauth2ClientSecret": "A String",
-        "oauth2ClientSecretSha256": "A String",
+        "oauth2ClientSecretSha256": "A String", # [Output Only] SHA256 hash value for the field oauth2_client_secret above.
       },
       "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
       "customRequestHeaders": [ # Headers that the HTTP/S load balancer should add to proxied requests.
@@ -495,6 +641,11 @@
     "connectionDraining": { # Message containing connection draining configuration.
       "drainingTimeoutSec": 42, # Time for which instance will be drained (not accept new connections, but still work to finish started).
     },
+    "failoverRatio": 3.14, # The value of the field must be in [0, 1]. If set, 'backends[].failover' must be set. They together define the fallback behavior of the primary backend: if the ratio of the healthy VMs in the primary backend is at or below this number, traffic arriving at the load-balanced IP will be directed to the failover backend.
+        # 
+        # In case where 'failoverRatio' is not set or all the VMs in the backup backend are unhealthy, the traffic will be directed back to the primary backend in the "force" mode, where traffic will be spread to the healthy VMs with the best effort, or to all VMs when no VM is healthy.
+        # 
+        # This field is only used with l4 load balancing.
     "protocol": "A String", # The protocol this BackendService uses to communicate with backends.
         # 
         # Possible values are HTTP, HTTPS, TCP, and SSL. The default is HTTP.
@@ -519,7 +670,7 @@
       "signedUrlKeyNames": [ # [Output Only] Names of the keys currently configured for Cloud CDN Signed URL on this backend service.
         "A String",
       ],
-      "signedUrlTtlSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
+      "signedUrlCacheMaxAgeSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
       "cacheKeyPolicy": { # Message containing what to include in the cache key for a request for Cloud CDN. # The CacheKeyPolicy for this CdnPolicy.
         "includeQueryString": True or False, # If true, include query string parameters in the cache key according to query_string_whitelist and query_string_blacklist. If neither is set, the entire query string will be included. If false, the query string will be excluded from the cache key entirely.
         "includeHost": True or False, # If true, requests to different hosts will be cached separately.
@@ -553,7 +704,7 @@
             #
             # This cannot be used for internal load balancing.
         "failover": True or False, # This field designates whether this is a failover backend. More than one failover backend can be configured for a given BackendService.
-        "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle.This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
+        "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
             #
             # This cannot be used for internal load balancing.
         "maxConnectionsPerInstance": 42, # The max number of simultaneous connections that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either CONNECTION or UTILIZATION balancing modes. For CONNECTION mode, either maxConnections or maxConnectionsPerInstance must be set.
@@ -577,7 +728,7 @@
       "oauth2ClientId": "A String",
       "enabled": True or False,
       "oauth2ClientSecret": "A String",
-      "oauth2ClientSecretSha256": "A String",
+      "oauth2ClientSecretSha256": "A String", # [Output Only] SHA256 hash value for the field oauth2_client_secret above.
     },
     "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
     "customRequestHeaders": [ # Headers that the HTTP/S load balancer should add to proxied requests.
@@ -680,6 +831,11 @@
           "connectionDraining": { # Message containing connection draining configuration.
             "drainingTimeoutSec": 42, # Time for which instance will be drained (not accept new connections, but still work to finish started).
           },
+          "failoverRatio": 3.14, # The value of the field must be in [0, 1]. If set, 'backends[].failover' must be set. They together define the fallback behavior of the primary backend: if the ratio of the healthy VMs in the primary backend is at or below this number, traffic arriving at the load-balanced IP will be directed to the failover backend.
+              #
+              # In case where 'failoverRatio' is not set or all the VMs in the backup backend are unhealthy, the traffic will be directed back to the primary backend in the "force" mode, where traffic will be spread to the healthy VMs with the best effort, or to all VMs when no VM is healthy.
+              #
+              # This field is only used with l4 load balancing.
           "protocol": "A String", # The protocol this BackendService uses to communicate with backends.
               #
               # Possible values are HTTP, HTTPS, TCP, and SSL. The default is HTTP.
@@ -704,7 +860,7 @@
             "signedUrlKeyNames": [ # [Output Only] Names of the keys currently configured for Cloud CDN Signed URL on this backend service.
               "A String",
             ],
-            "signedUrlTtlSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
+            "signedUrlCacheMaxAgeSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
             "cacheKeyPolicy": { # Message containing what to include in the cache key for a request for Cloud CDN. # The CacheKeyPolicy for this CdnPolicy.
               "includeQueryString": True or False, # If true, include query string parameters in the cache key according to query_string_whitelist and query_string_blacklist. If neither is set, the entire query string will be included. If false, the query string will be excluded from the cache key entirely.
               "includeHost": True or False, # If true, requests to different hosts will be cached separately.
@@ -738,7 +894,7 @@
                   #
                   # This cannot be used for internal load balancing.
               "failover": True or False, # This field designates whether this is a failover backend. More than one failover backend can be configured for a given BackendService.
-              "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle.This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
+              "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
                   #
                   # This cannot be used for internal load balancing.
               "maxConnectionsPerInstance": 42, # The max number of simultaneous connections that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either CONNECTION or UTILIZATION balancing modes. For CONNECTION mode, either maxConnections or maxConnectionsPerInstance must be set.
@@ -762,7 +918,7 @@
             "oauth2ClientId": "A String",
             "enabled": True or False,
             "oauth2ClientSecret": "A String",
-            "oauth2ClientSecretSha256": "A String",
+            "oauth2ClientSecretSha256": "A String", # [Output Only] SHA256 hash value for the field oauth2_client_secret above.
           },
           "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
           "customRequestHeaders": [ # Headers that the HTTP/S load balancer should add to proxied requests.
@@ -814,6 +970,11 @@
     "connectionDraining": { # Message containing connection draining configuration.
       "drainingTimeoutSec": 42, # Time for which instance will be drained (not accept new connections, but still work to finish started).
     },
+    "failoverRatio": 3.14, # The value of the field must be in [0, 1]. If set, 'backends[].failover' must be set. They together define the fallback behavior of the primary backend: if the ratio of the healthy VMs in the primary backend is at or below this number, traffic arriving at the load-balanced IP will be directed to the failover backend.
+        # 
+        # In case where 'failoverRatio' is not set or all the VMs in the backup backend are unhealthy, the traffic will be directed back to the primary backend in the "force" mode, where traffic will be spread to the healthy VMs with the best effort, or to all VMs when no VM is healthy.
+        # 
+        # This field is only used with l4 load balancing.
     "protocol": "A String", # The protocol this BackendService uses to communicate with backends.
         # 
         # Possible values are HTTP, HTTPS, TCP, and SSL. The default is HTTP.
@@ -838,7 +999,7 @@
       "signedUrlKeyNames": [ # [Output Only] Names of the keys currently configured for Cloud CDN Signed URL on this backend service.
         "A String",
       ],
-      "signedUrlTtlSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
+      "signedUrlCacheMaxAgeSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
       "cacheKeyPolicy": { # Message containing what to include in the cache key for a request for Cloud CDN. # The CacheKeyPolicy for this CdnPolicy.
         "includeQueryString": True or False, # If true, include query string parameters in the cache key according to query_string_whitelist and query_string_blacklist. If neither is set, the entire query string will be included. If false, the query string will be excluded from the cache key entirely.
         "includeHost": True or False, # If true, requests to different hosts will be cached separately.
@@ -872,7 +1033,7 @@
             #
             # This cannot be used for internal load balancing.
         "failover": True or False, # This field designates whether this is a failover backend. More than one failover backend can be configured for a given BackendService.
-        "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle.This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
+        "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
             #
             # This cannot be used for internal load balancing.
         "maxConnectionsPerInstance": 42, # The max number of simultaneous connections that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either CONNECTION or UTILIZATION balancing modes. For CONNECTION mode, either maxConnections or maxConnectionsPerInstance must be set.
@@ -896,7 +1057,7 @@
       "oauth2ClientId": "A String",
       "enabled": True or False,
       "oauth2ClientSecret": "A String",
-      "oauth2ClientSecretSha256": "A String",
+      "oauth2ClientSecretSha256": "A String", # [Output Only] SHA256 hash value for the field oauth2_client_secret above.
     },
     "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
     "customRequestHeaders": [ # Headers that the HTTP/S load balancer should add to proxied requests.
@@ -967,6 +1128,72 @@
 </div>
 
 <div class="method">
+    <code class="details" id="setSecurityPolicy">setSecurityPolicy(project, backendService, body, requestId=None)</code>
+  <pre>Sets the security policy for the specified backend service.
+
+Args:
+  project: string, Project ID for this request. (required)
+  backendService: string, Name of the BackendService resource to which the security policy should be set. The name should conform to RFC1035. (required)
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{
+    "securityPolicy": "A String",
+  }
+
+  requestId: string, begin_interface: MixerMutationRequestBuilder Request ID to support idempotency.
+
+Returns:
+  An object of the form:
+
+    { # An Operation resource, used to manage asynchronous API requests.
+    "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
+    "clientOperationId": "A String", # [Output Only] Reserved for future use.
+    "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
+    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only available when performing per-zone operations.
+    "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
+    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
+    "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
+      {
+        "message": "A String", # [Output Only] A human-readable description of the warning code.
+        "code": "A String", # [Output Only] A warning code, if applicable. For example, Compute Engine returns NO_RESULTS_ON_PAGE if there are no results in the response.
+        "data": [ # [Output Only] Metadata about this warning in key: value format. For example:
+            # "data": [ { "key": "scope", "value": "zones/us-east1-d" }
+          {
+            "value": "A String", # [Output Only] A warning data value corresponding to the key.
+            "key": "A String", # [Output Only] A key that provides more detail on the warning being returned. For example, for warnings where there are no results in a list request for a particular zone, this key might be scope and the key value might be the zone name. Other examples might be a key indicating a deprecated resource and a suggested replacement, or a warning about invalid network settings (for example, if an instance attempts to perform IP forwarding but is not enabled for IP forwarding).
+          },
+        ],
+      },
+    ],
+    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
+    "name": "A String", # [Output Only] Name of the resource.
+    "region": "A String", # [Output Only] The URL of the region where the operation resides. Only available when performing regional operations.
+    "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
+      "errors": [ # [Output Only] The array of errors encountered while processing this operation.
+        {
+          "message": "A String", # [Output Only] An optional, human-readable error message.
+          "code": "A String", # [Output Only] The error type identifier for this error.
+          "location": "A String", # [Output Only] Indicates the field in the request that caused the error. This property is optional.
+        },
+      ],
+    },
+    "endTime": "A String", # [Output Only] The time that this operation was completed. This value is in RFC3339 text format.
+    "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
+    "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. For operations related to creating a snapshot, this points to the persistent disk that the snapshot was created from.
+  }</pre>
+</div>
+
+<div class="method">
     <code class="details" id="testIamPermissions">testIamPermissions(project, resource, body)</code>
   <pre>Returns permissions that a caller has on the specified resource.
 
@@ -1007,6 +1234,11 @@
     "connectionDraining": { # Message containing connection draining configuration.
       "drainingTimeoutSec": 42, # Time for which instance will be drained (not accept new connections, but still work to finish started).
     },
+    "failoverRatio": 3.14, # The value of the field must be in [0, 1]. If set, 'backends[].failover' must be set. They together define the fallback behavior of the primary backend: if the ratio of the healthy VMs in the primary backend is at or below this number, traffic arriving at the load-balanced IP will be directed to the failover backend.
+        # 
+        # In case where 'failoverRatio' is not set or all the VMs in the backup backend are unhealthy, the traffic will be directed back to the primary backend in the "force" mode, where traffic will be spread to the healthy VMs with the best effort, or to all VMs when no VM is healthy.
+        # 
+        # This field is only used with l4 load balancing.
     "protocol": "A String", # The protocol this BackendService uses to communicate with backends.
         # 
         # Possible values are HTTP, HTTPS, TCP, and SSL. The default is HTTP.
@@ -1031,7 +1263,7 @@
       "signedUrlKeyNames": [ # [Output Only] Names of the keys currently configured for Cloud CDN Signed URL on this backend service.
         "A String",
       ],
-      "signedUrlTtlSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
+      "signedUrlCacheMaxAgeSec": "A String", # Number of seconds up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Defaults to 1hr (3600s). If this field is set, Cloud CDN will internally act as though all responses from this backend had a ?Cache-Control: public, max-age=[TTL]? header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.
       "cacheKeyPolicy": { # Message containing what to include in the cache key for a request for Cloud CDN. # The CacheKeyPolicy for this CdnPolicy.
         "includeQueryString": True or False, # If true, include query string parameters in the cache key according to query_string_whitelist and query_string_blacklist. If neither is set, the entire query string will be included. If false, the query string will be excluded from the cache key entirely.
         "includeHost": True or False, # If true, requests to different hosts will be cached separately.
@@ -1065,7 +1297,7 @@
             #
             # This cannot be used for internal load balancing.
         "failover": True or False, # This field designates whether this is a failover backend. More than one failover backend can be configured for a given BackendService.
-        "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle.This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
+        "maxRatePerInstance": 3.14, # The max requests per second (RPS) that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either balancing mode. For RATE mode, either maxRate or maxRatePerInstance must be set.
             #
             # This cannot be used for internal load balancing.
         "maxConnectionsPerInstance": 42, # The max number of simultaneous connections that a single backend instance can handle. This is used to calculate the capacity of the group. Can be used in either CONNECTION or UTILIZATION balancing modes. For CONNECTION mode, either maxConnections or maxConnectionsPerInstance must be set.
@@ -1089,7 +1321,7 @@
       "oauth2ClientId": "A String",
       "enabled": True or False,
       "oauth2ClientSecret": "A String",
-      "oauth2ClientSecretSha256": "A String",
+      "oauth2ClientSecretSha256": "A String", # [Output Only] SHA256 hash value for the field oauth2_client_secret above.
     },
     "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
     "customRequestHeaders": [ # Headers that the HTTP/S load balancer should add to proxied requests.