English

Middleware

WARNING

Middleware has been deprecated. Please use the new Custom Web Server to handle page requests.

Used to extend the built-in Web Server of Modern.js, unlike Hook, Middleware can directly operate Node's origin request and response, and can be extended using the framework plugin.

Usage

import { Middleware } from '@modern-js/runtime/server';

export const middleware: Middleware = async (context, next) => {};
export const middleware: Middleware[] = [
  async (context, next) => {},
  async (context, next) => {},
];

INFO

Before using this API, please execute pnpm run new to create a new "Custom Web Server" source code directory.

pnpm run new
? Please select the operation you want: Create Element
? Please select the type of element to create: New "Custom Web Server" source code directory

Function Signature

type Middleware = (
  context: MiddlewareContext,
  next: NextFunction,
) => Promise<void> | void;

type MiddlewareContext = {
  response: {
    set: (key: string, value: string) => void;
    status: (code: number) => void;
    getStatus: () => number;
    cookies: {
      set: (key: string, value: string, options?: any) => void;
      clear: () => void;
    };
    raw: (
      body: string,
      { status, headers }: { status: number; headers: Record<string, any> },
    ) => void;
    locals: Record<string, any>;
  };
  request: {
    host: string;
    pathname: string;
    query: Record<string, any>;
    cookie: string;
    cookies: {
      get: (key: string) => string;
    };
    headers: IncomingHttpHeaders;
  };
  source: {
    req: IncomingMessage;
    res: ServerResponse;
  };
};

Input

context: Middleware context.
- response: provides a series of methods to process the response.
- request: provides a series of methods to get request info.
- source: provides Node.js native req and res object.
next: call next listener (not affect the server process, only current hook).

WARNING

The execution of the next function does not affect built-in processes, only controls whether the next middleware executes. Rendering processes are interrupted only when the response is written.

Example

Tracking

export const Middleware = () => async (ctx, next) => {
  const start = Date.now();
  ctx.source.res.once('finish', () => {
    console.log(Date.now() - start);
  });
};

Inject Tools & Data

Modern.js provides res.locals to store local variables for the current request.

export const Middleware = () => async (ctx, next) => {
  ctx.response.locals.id = 'Modern.js';
  ctx.response.locals.rpc = createRpcInstance();
};

#Middleware

#Usage

#Function Signature

#Input

#Example

#Tracking