import * as http from 'http';
import * as querystring from 'querystring';
import * as fs from 'fs';

/**
 * Read all the data from an HTTP request.
 */
export function body(req: http.IncomingMessage): Promise<string> {
  return new Promise((resolve, reject) => {
    let body = '';
    req.on('data', (data) => {
      body += data;
    });
    req.on('end', () => {
      resolve(body);
    });
  });
}

/**
 * Read the body of the request as urlencoded form data.
 */
export async function formdata(req: http.IncomingMessage) {
  let s = await body(req);
  return querystring.parse(s);
}

/**
 * Send a file from the filesystem as an HTTP response.
 */
export function sendfile(res: http.ServerResponse, path: string, mime='text/html') {
  res.statusCode = 200;
  res.setHeader('Content-Type', mime);

  let stream = fs.createReadStream(path);
  stream.on('error', (e: any) => {
    if (e.code === 'ENOENT') {
      console.error(`static path ${path} not found`);
      res.statusCode = 404;
      res.end('not found');
    } else {
      console.error(`filesystem error: ${e}`);
      res.statusCode = 500;
      res.end('internal server error');
    }
  });
  stream.pipe(res);
}

/**
 * A handler that sends a static file.
 */
export function file(path: string, mime='text/html') {
  return (req: http.IncomingMessage, res: http.ServerResponse) => {
    sendfile(res, path, mime);
  };
}

import * as http from 'http';
import * as querystring from 'querystring';
import * as fs from 'fs';

/**
 * Read all the data from an HTTP request.
 */
export function body(req: http.IncomingMessage): Promise<string> {
  return new Promise((resolve, reject) => {
    let body = '';
    req.on('data', (data) => {
      body += data;
    });
    req.on('end', () => {
      resolve(body);
    });
  });
}

/**
 * Read the body of the request as urlencoded form data.
 */
export async function formdata(req: http.IncomingMessage) {
  let s = await body(req);
  return querystring.parse(s);
}

/**
 * Send a file from the filesystem as an HTTP response.
 */
export function sendfile(res: http.ServerResponse, path: string, mime='text/html') {
  res.statusCode = 200;
  res.setHeader('Content-Type', mime);
  fs.createReadStream(path).pipe(res);
}

/**
 * A handler that sends a static file.
 */
export function file(path: string, mime='text/html') {
  return (req: http.IncomingMessage, res: http.ServerResponse) => {
    sendfile(res, path, mime);
  };
}

--- 
+++ 
@@ -31,7 +31,20 @@
 export function sendfile(res: http.ServerResponse, path: string, mime='text/html') {
   res.statusCode = 200;
   res.setHeader('Content-Type', mime);
-  fs.createReadStream(path).pipe(res);
+
+  let stream = fs.createReadStream(path);
+  stream.on('error', (e: any) => {
+    if (e.code === 'ENOENT') {
+      console.error(`static path ${path} not found`);
+      res.statusCode = 404;
+      res.end('not found');
+    } else {
+      console.error(`filesystem error: ${e}`);
+      res.statusCode = 500;
+      res.end('internal server error');
+    }
+  });
+  stream.pipe(res);
 }
 
 /**
Handle errors when serving static files
