diff --git a/src/node/plugin.ts b/src/node/plugin.ts
index 70220103..07998100 100644
--- a/src/node/plugin.ts
+++ b/src/node/plugin.ts
@@ -4,6 +4,7 @@ import * as fs from "fs"
 import * as path from "path"
 import * as semver from "semver"
 import * as pluginapi from "../../typings/pluginapi"
+import { HttpCode, HttpError } from "../common/http"
 import { version } from "./constants"
 import { replaceTemplates } from "./http"
 import { proxy } from "./proxy"
@@ -22,6 +23,8 @@ require("module")._load = function (request: string, parent: object, isMain: boo
     return {
       express,
       field,
+      HttpCode,
+      HttpError,
       Level,
       proxy,
       replaceTemplates,
diff --git a/test/plugin.test.ts b/test/plugin.test.ts
index 139885da..b5bfb763 100644
--- a/test/plugin.test.ts
+++ b/test/plugin.test.ts
@@ -2,6 +2,7 @@ import { logger } from "@coder/logger"
 import * as express from "express"
 import * as fs from "fs"
 import * as path from "path"
+import { HttpCode } from "../src/common/http"
 import { PluginAPI } from "../src/node/plugin"
 import * as apps from "../src/node/routes/apps"
 import * as httpserver from "./httpserver"
@@ -81,4 +82,9 @@ describe("plugin", () => {
     ws.terminate()
     expect(message).toBe("hello")
   })
+
+  it("/test-plugin/error", async () => {
+    const resp = await s.fetch("/test-plugin/error")
+    expect(resp.status).toBe(HttpCode.LargePayload)
+  })
 })
diff --git a/test/test-plugin/src/index.ts b/test/test-plugin/src/index.ts
index 211ddf0d..592ad372 100644
--- a/test/test-plugin/src/index.ts
+++ b/test/test-plugin/src/index.ts
@@ -19,6 +19,9 @@ export const plugin: cs.Plugin = {
     r.get("/goland/icon.svg", (_, res) => {
       res.sendFile(fspath.resolve(__dirname, "../public/icon.svg"))
     })
+    r.get("/error", () => {
+      throw new cs.HttpError("error", cs.HttpCode.LargePayload)
+    })
     return r
   },
 
diff --git a/typings/pluginapi.d.ts b/typings/pluginapi.d.ts
index fbac3af9..383bf962 100644
--- a/typings/pluginapi.d.ts
+++ b/typings/pluginapi.d.ts
@@ -82,6 +82,20 @@ import Websocket from "ws"
  * ]
  */
 
+export enum HttpCode {
+  Ok = 200,
+  Redirect = 302,
+  NotFound = 404,
+  BadRequest = 400,
+  Unauthorized = 401,
+  LargePayload = 413,
+  ServerError = 500,
+}
+
+export declare class HttpError extends Error {
+  constructor(message: string, status: HttpCode, details?: object)
+}
+
 export interface WebsocketRequest extends express.Request {
   ws: net.Socket
   head: Buffer