如何在node.js中发出HTTP POST请求？

这是一个使用node.js向Google Compiler API发出POST请求的示例：

// We need this to build our post stringvar querystring = require('querystring');var http = require('http');var fs = require('fs');function PostCode(prestring) {  // Build the post string from an object  var post_data = querystring.stringify({      'compilation_level' : 'ADVANCED_OPTIMIZATIONS',      'output_format': 'json',      'output_info': 'compiled_pre',        'warning_level' : 'QUIET',        'js_pre' : prestring  });  // An object of options to indicate where to post to  var post_options = {      host: 'closure-compiler.appspot.com',      port: '80',      path: '/compile',      method: 'POST',      headers: {          'Content-Type': 'application/x-www-form-urlenpred',          'Content-Length': Buffer.byteLength(post_data)      }  };  // Set up the request  var post_req = http.request(post_options, function(res) {      res.setEncoding('utf8');      res.on('data', function (chunk) {          console.log('Response: ' + chunk);      });  });  // post the data  post_req.write(post_data);  post_req.end();}// This is an async file readfs.readFile('linkedList.js', 'utf-8', function (err, data) {  if (err) {    // If this were just a small part of the application, you would    // want to handle this differently, maybe throwing an exception    // for the caller to handle. Since the file is absolutely essential    // to the program's functionality, we're going to exit with a fatal    // error instead.    console.log("FATAL An error occurred trying to read in the file: " + err);    process.exit(-2);  }  // Make sure there's data before we post it  if(data) {    PostCode(data);  }  else {    console.log("No data to post");    process.exit(-1);  }});

我已经更新了代码，以显示如何从文件而不是硬编码的字符串发布数据。它使用async

fs.readFile