diff --git a/specification/webpubsub/data-plane/WebPubSub/preview/2021-08-01-preview/webpubsub.json b/specification/webpubsub/data-plane/WebPubSub/preview/2021-08-01-preview/webpubsub.json
new file mode 100644
index 000000000000..722bac5465ee
--- /dev/null
+++ b/specification/webpubsub/data-plane/WebPubSub/preview/2021-08-01-preview/webpubsub.json
@@ -0,0 +1,989 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "title": "Azure Web PubSub Service REST API",
+    "version": "2021-08-01-preview"
+  },
+  "paths": {
+    "/api/health": {
+      "head": {
+        "tags": [
+          "general"
+        ],
+        "summary": "Get service health status.",
+        "operationId": "HealthApi_GetServiceStatus",
+        "parameters": [
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The service is healthy"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/:generateToken": {
+      "post": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Generate token for the client to connect Azure Web PubSub service.",
+        "operationId": "WebPubSub_GenerateClientToken",
+        "produces": [
+          "text/plain",
+          "application/json",
+          "text/json"
+        ],
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "query",
+            "name": "userId",
+            "description": "User Id.",
+            "type": "string",
+            "default": ""
+          },
+          {
+            "in": "query",
+            "name": "role",
+            "description": "Roles that the connection with the generated token will have.",
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "collectionFormat": "multi"
+          },
+          {
+            "in": "query",
+            "name": "minutesToExpire",
+            "description": "The expire time of the generated token.",
+            "type": "integer",
+            "format": "int32",
+            "default": 60
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success",
+            "schema": {
+              "$ref": "#/definitions/ClientTokenResponse"
+            }
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/:send": {
+      "post": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Broadcast content inside request body to all the connected client connections.",
+        "operationId": "WebPubSub_SendToAll",
+        "consumes": [
+          "application/octet-stream",
+          "text/plain",
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "query",
+            "name": "excluded",
+            "description": "Excluded connection Ids.",
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "collectionFormat": "multi"
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          },
+          {
+            "in": "body",
+            "name": "message",
+            "description": "The payload body.",
+            "required": true,
+            "schema": {
+              "format": "binary",
+              "type": "string"
+            }
+          }
+        ],
+        "responses": {
+          "202": {
+            "description": "The message is accepted. The service follows fire-and-forget pattern when sending messages."
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/connections/{connectionId}": {
+      "head": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Check if the connection with the given connectionId exists.",
+        "operationId": "WebPubSub_ConnectionExists",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "connectionId",
+            "description": "The connection Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "404": {
+            "description": "Not Found"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      },
+      "delete": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Close the client connection.",
+        "operationId": "WebPubSub_CloseConnection",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "connectionId",
+            "description": "Target connection Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "reason",
+            "description": "The reason closing the client connection.",
+            "type": "string"
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/connections/{connectionId}/:send": {
+      "post": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Send content inside request body to the specific connection.",
+        "operationId": "WebPubSub_SendToConnection",
+        "consumes": [
+          "application/octet-stream",
+          "text/plain",
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "connectionId",
+            "description": "The connection Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          },
+          {
+            "in": "body",
+            "name": "message",
+            "description": "The payload body.",
+            "required": true,
+            "schema": {
+              "format": "binary",
+              "type": "string"
+            }
+          }
+        ],
+        "responses": {
+          "202": {
+            "description": "Success"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/groups/{group}": {
+      "head": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Check if there are any client connections inside the given group",
+        "operationId": "WebPubSub_GroupExists",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "group",
+            "description": "Target group name, which length should be greater than 0 and less than 1025.",
+            "required": true,
+            "type": "string",
+            "maxLength": 1024,
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "404": {
+            "description": "Not Found"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/groups/{group}/:send": {
+      "post": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Send content inside request body to a group of connections.",
+        "operationId": "WebPubSub_SendToGroup",
+        "consumes": [
+          "application/octet-stream",
+          "text/plain",
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "group",
+            "description": "Target group name, which length should be greater than 0 and less than 1025.",
+            "required": true,
+            "type": "string",
+            "maxLength": 1024,
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "excluded",
+            "description": "Excluded connection Ids",
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "collectionFormat": "multi"
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          },
+          {
+            "in": "body",
+            "name": "message",
+            "description": "The payload body.",
+            "required": true,
+            "schema": {
+              "format": "binary",
+              "type": "string"
+            }
+          }
+        ],
+        "responses": {
+          "202": {
+            "description": "Success"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/groups/{group}/connections/{connectionId}": {
+      "put": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Add a connection to the target group.",
+        "operationId": "WebPubSub_AddConnectionToGroup",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "group",
+            "description": "Target group name, which length should be greater than 0 and less than 1025.",
+            "required": true,
+            "type": "string",
+            "maxLength": 1024,
+            "minLength": 1
+          },
+          {
+            "in": "path",
+            "name": "connectionId",
+            "description": "Target connection Id",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "404": {
+            "description": "Not Found"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      },
+      "delete": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Remove a connection from the target group.",
+        "operationId": "WebPubSub_RemoveConnectionFromGroup",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "group",
+            "description": "Target group name, which length should be greater than 0 and less than 1025.",
+            "required": true,
+            "type": "string",
+            "maxLength": 1024,
+            "minLength": 1
+          },
+          {
+            "in": "path",
+            "name": "connectionId",
+            "description": "Target connection Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/users/{userId}": {
+      "head": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Check if there are any client connections connected for the given user.",
+        "operationId": "WebPubSub_UserExists",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "userId",
+            "description": "Target user Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "404": {
+            "description": "Not Found"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/users/{userId}/:send": {
+      "post": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Send content inside request body to the specific user.",
+        "operationId": "WebPubSub_SendToUser",
+        "consumes": [
+          "application/octet-stream",
+          "text/plain",
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "userId",
+            "description": "The user Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          },
+          {
+            "in": "body",
+            "name": "message",
+            "description": "The payload body.",
+            "required": true,
+            "schema": {
+              "format": "binary",
+              "type": "string"
+            }
+          }
+        ],
+        "responses": {
+          "202": {
+            "description": "Success"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/users/{userId}/groups/{group}": {
+      "put": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Add a user to the target group.",
+        "operationId": "WebPubSub_AddUserToGroup",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "group",
+            "description": "Target group name, which length should be greater than 0 and less than 1025.",
+            "required": true,
+            "type": "string",
+            "maxLength": 1024,
+            "minLength": 1
+          },
+          {
+            "in": "path",
+            "name": "userId",
+            "description": "Target user Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "404": {
+            "description": "Not Found"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      },
+      "delete": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Remove a user from the target group.",
+        "operationId": "WebPubSub_RemoveUserFromGroup",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "group",
+            "description": "Target group name, which length should be greater than 0 and less than 1025.",
+            "required": true,
+            "type": "string",
+            "maxLength": 1024,
+            "minLength": 1
+          },
+          {
+            "in": "path",
+            "name": "userId",
+            "description": "Target user Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/users/{userId}/groups": {
+      "delete": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Remove a user from all groups.",
+        "operationId": "WebPubSub_RemoveUserFromAllGroups",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "userId",
+            "description": "Target user Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The user is deleted."
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    },
+    "/api/hubs/{hub}/permissions/{permission}/connections/{connectionId}": {
+      "put": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Grant permission to the connection.",
+        "operationId": "WebPubSub_GrantPermission",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "permission",
+            "description": "The permission: current supported actions are joinLeaveGroup and sendToGroup.",
+            "required": true,
+            "type": "string",
+            "enum": [
+              "sendToGroup",
+              "joinLeaveGroup"
+            ],
+            "x-ms-enum": {
+              "name": "WebPubSubPermission",
+              "modelAsString": true
+            }
+          },
+          {
+            "in": "path",
+            "name": "connectionId",
+            "description": "Target connection Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "targetName",
+            "description": "The meaning of the target depends on the specific permission. For joinLeaveGroup and sendToGroup, targetName is a required parameter standing for the group name.",
+            "type": "string"
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      },
+      "delete": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Revoke permission for the connection.",
+        "operationId": "WebPubSub_RevokePermission",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "permission",
+            "description": "The permission: current supported actions are joinLeaveGroup and sendToGroup.",
+            "required": true,
+            "type": "string",
+            "enum": [
+              "sendToGroup",
+              "joinLeaveGroup"
+            ],
+            "x-ms-enum": {
+              "name": "WebPubSubPermission",
+              "modelAsString": true
+            }
+          },
+          {
+            "in": "path",
+            "name": "connectionId",
+            "description": "Target connection Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "targetName",
+            "description": "The meaning of the target depends on the specific permission. For joinLeaveGroup and sendToGroup, targetName is a required parameter standing for the group name.",
+            "type": "string"
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      },
+      "head": {
+        "tags": [
+          "webpubsub"
+        ],
+        "summary": "Check if a connection has permission to the specified action.",
+        "operationId": "WebPubSub_CheckPermission",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hub",
+            "description": "Target hub name, which should start with alphabetic characters and only contain alpha-numeric characters or underscore.",
+            "required": true,
+            "type": "string",
+            "pattern": "^[A-Za-z][A-Za-z0-9_`,.[\\]]{0,127}$"
+          },
+          {
+            "in": "path",
+            "name": "permission",
+            "description": "The permission: current supported actions are joinLeaveGroup and sendToGroup.",
+            "required": true,
+            "type": "string",
+            "enum": [
+              "sendToGroup",
+              "joinLeaveGroup"
+            ],
+            "x-ms-enum": {
+              "name": "WebPubSubPermission",
+              "modelAsString": true
+            }
+          },
+          {
+            "in": "path",
+            "name": "connectionId",
+            "description": "Target connection Id.",
+            "required": true,
+            "type": "string",
+            "minLength": 1
+          },
+          {
+            "in": "query",
+            "name": "targetName",
+            "description": "The meaning of the target depends on the specific permission. For joinLeaveGroup and sendToGroup, targetName is a required parameter standing for the group name.",
+            "type": "string"
+          },
+          {
+            "in": "query",
+            "name": "api-version",
+            "description": "The version of the REST APIs.",
+            "type": "string",
+            "default": "2021-05-01-preview"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success"
+          },
+          "404": {
+            "description": "Not Found"
+          },
+          "default": {
+            "description": "Error response",
+            "x-ms-error-response": true
+          }
+        }
+      }
+    }
+  },
+  "definitions": {
+    "ClientTokenResponse": {
+      "type": "object",
+      "properties": {
+        "token": {
+          "type": "string"
+        }
+      }
+    }
+  }
+}
diff --git a/specification/webpubsub/data-plane/readme.md b/specification/webpubsub/data-plane/readme.md
index 776fdfa0483f..40b0bb05aae8 100644
--- a/specification/webpubsub/data-plane/readme.md
+++ b/specification/webpubsub/data-plane/readme.md
@@ -26,7 +26,7 @@ These are the global settings for the Web PubSub Service API.
 
 ``` yaml
 openapi-type: data-plane
-tag: package-2021-05-01-preview
+tag: package-2021-08-01-preview
 ```
 
 ### Suppression
@@ -39,6 +39,16 @@ directive:
     reason: There are a lot of APIs that does not have the example. While it is being worked upon disabling this to ensure that we catch and fix other violations
 ```
 
+### Tag: package-2021-08-01-preview
+
+These settings apply only when `--tag=package-2021-08-01-preview` is specified on the command line.
+
+``` yaml $(tag) == 'package-2021-08-01-preview'
+input-file:
+- WebPubSub/preview/2021-08-01-preview/webpubsub.json
+title: AzureMessagingWebPubSubServiceClient
+```
+
 ### Tag: package-2021-05-01-preview
 
 These settings apply only when `--tag=package-2021-05-01-preview` is specified on the command line.