app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

POST /test HTTP/1.1
Host: 127.0.0.1:3000
Content-Type: text/plain; charset=utf8
Content-Encoding: gzip

chyingp

var http = require('http');

var options = {
  hostname: '127.0.0.1',
  port: '3000',
  path: '/test',
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
    'Content-Encoding': 'identity'
  }
};

var client = http.request(options, (res) => {
  res.pipe(process.stdout);
});

client.end('chyingp');

var http = require('http');

var parsePostBody = function (req, done) {
  var arr = [];
  var chunks;

  req.on('data', buff => {
    arr.push(buff);
  });

  req.on('end', () => {
    chunks = Buffer.concat(arr);
    done(chunks);
  });
};

var server = http.createServer(function (req, res) {
  parsePostBody(req, (chunks) => {
    var body = chunks.toString();
    res.end(`Your nick is ${body}`)
  });
});

server.listen(3000);

var http = require('http');
var querystring = require('querystring');

var options = {
  hostname: '127.0.0.1',
  port: '3000',
  path: '/test',
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Content-Encoding': 'identity'
  }
};

var jsonBody = {
  nick: 'chyingp'
};

var client = http.request(options, (res) => {
  res.pipe(process.stdout);
});

client.end( JSON.stringify(jsonBody) );

var http = require('http');

var parsePostBody = function (req, done) {
  var length = req.headers['content-length'] - 0;
  var arr = [];
  var chunks;

  req.on('data', buff => {
    arr.push(buff);
  });

  req.on('end', () => {
    chunks = Buffer.concat(arr);
    done(chunks);
  });
};

var server = http.createServer(function (req, res) {
  parsePostBody(req, (chunks) => {
    var json = JSON.parse( chunks.toString() );  // 关键代码  
    res.end(`Your nick is ${json.nick}`)
  });
});

server.listen(3000);

var http = require('http');
var querystring = require('querystring');

var options = {
  hostname: '127.0.0.1',
  port: '3000',
  path: '/test',
  method: 'POST',
  headers: {
    'Content-Type': 'form/x-www-form-urlencoded',
    'Content-Encoding': 'identity'
  }
};

var postBody = { nick: 'chyingp' };

var client = http.request(options, (res) => {
  res.pipe(process.stdout);
});

client.end( querystring.stringify(postBody) );

var http = require('http');
var querystring = require('querystring');

var parsePostBody = function (req, done) {
  var length = req.headers['content-length'] - 0;
  var arr = [];
  var chunks;

  req.on('data', buff => {
    arr.push(buff);
  });

  req.on('end', () => {
    chunks = Buffer.concat(arr);
    done(chunks);
  });
};

var server = http.createServer(function (req, res) {
  parsePostBody(req, (chunks) => {
    var body = querystring.parse( chunks.toString() ); // 关键代码
    res.end(`Your nick is ${body.nick}`)
  });
});

server.listen(3000);

var http = require('http');
var iconv = require('iconv-lite');

var encoding = 'gbk'; // 请求编码

var options = {
  hostname: '127.0.0.1',
  port: '3000',
  path: '/test',
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain; charset=' + encoding,
    'Content-Encoding': 'identity',    
  }
};

// 备注：nodejs本身不支持gbk编码，所以请求发送前，需要先进行编码
var buff = iconv.encode('程序猿小卡', encoding);

var client = http.request(options, (res) => {
  res.pipe(process.stdout);
});

client.end(buff, encoding);

var http = require('http');
var contentType = require('content-type');
var iconv = require('iconv-lite');

var parsePostBody = function (req, done) {
  var obj = contentType.parse(req.headers['content-type']);
  var charset = obj.parameters.charset; // 编码判断：这里获取到的值是 'gbk'

  var arr = [];
  var chunks;

  req.on('data', buff => {
    arr.push(buff);
  });

  req.on('end', () => {
    chunks = Buffer.concat(arr);
    var body = iconv.decode(chunks, charset); // 解码操作
    done(body);
  });
};

var server = http.createServer(function (req, res) {
  parsePostBody(req, (body) => {
    res.end(`Your nick is ${body}`)
  });
});

server.listen(3000);

var http = require('http');
var zlib = require('zlib');

var options = {
  hostname: '127.0.0.1',
  port: '3000',
  path: '/test',
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
    'Content-Encoding': 'gzip'
  }
};

var client = http.request(options, (res) => {
  res.pipe(process.stdout);
});

// 注意：将 Content-Encoding 设置为 gzip 的同时，发送给服务端的数据也应该先进行gzip
var buff = zlib.gzipSync('chyingp');

client.end(buff);

var http = require('http');
var zlib = require('zlib');

var parsePostBody = function (req, done) {
  var length = req.headers['content-length'] - 0;
  var contentEncoding = req.headers['content-encoding'];
  var stream = req;

  // 关键代码如下
  if(contentEncoding === 'gzip') {
    stream = zlib.createGunzip();
    req.pipe(stream);
  }

  var arr = [];
  var chunks;

  stream.on('data', buff => {
    arr.push(buff);
  });

  stream.on('end', () => {
    chunks = Buffer.concat(arr);    
    done(chunks);
  });

  stream.on('error', error => console.error(error.message));
};

var server = http.createServer(function (req, res) {
  parsePostBody(req, (chunks) => {
    var body = chunks.toString();
    res.end(`Your nick is ${body}`)
  });
});

server.listen(3000);