Angular http.post作为Options方法请求(Angular http.post as Options method request)

 我正在尝试将一些数据发布到节点服务器，但我有一个问题： 
 
postEmployeeForm(employee: Employee):Observable<any> {
        let body = JSON.stringify(employee);
        let headers = new Headers({ 'Content-Type': 'application/json' });
        let options = new RequestOptions({ headers: headers });

        return this.http.post('http://localhost:3100/postemployee', body, options)
             .map(this.extractData)
             .catch(this.handleError);
    }
 
 这是我在网络选项卡中的帖子请求我在服务器上看到这是选项方法我期待一个帖子请求。 
 
 如果我从http.post中省略选项，那么我在服务器上获得发布请求，但是我有关于意外内容类型的错误。 
 
postEmployeeForm(employee: Employee):Observable<any> {
        let body = JSON.stringify(employee);

        return this.http.post('http://localhost:3100/postemployee', body)
             .map(this.extractData)
             .catch(this.handleError);
    }
 
 这是预期的行为还是我在帖子上做错了。 我在官方角度指南上找到了这个代码： 服务器通信如何处理这种情况，我是否需要在客户端更改某些内容或者我应该在服务器端处理它？ 
 
 编辑： 
 
 这是我的服务器代码： 
 
var http = require('http');
var formidable = require("formidable");
var util = require('util');

var server = http.createServer(function(req, res) {
    res.setHeader('Access-Control-Allow-Origin','*');
    res.setHeader('Access-Control-Allow-Headers','Origin, X-Requested-With, Content-Type, Accept');

    if(req.method.toLowerCase() == 'post') {
        console.log("Get request!");
        processForm(req,res);
        return;
    }
});

function processForm(req,res) {

    var form = new formidable.IncomingForm();
    form.parse(req, function(err, fields) {

        res.writeHead(200, {
            'content-type': 'application/json'
        });

        res.end(util.inspect({
            fields: fields
        }));

        console.log('posted fields:\n');
        console.log(util.inspect({
            fields: fields
        }));
    });
}

var port = 3100;
server.listen(port,'localhost');
console.log("server listening on port " + port);

I'm trying to post some data to node server, but I have an issue:
 
postEmployeeForm(employee: Employee):Observable<any> {
        let body = JSON.stringify(employee);
        let headers = new Headers({ 'Content-Type': 'application/json' });
        let options = new RequestOptions({ headers: headers });

        return this.http.post('http://localhost:3100/postemployee', body, options)
             .map(this.extractData)
             .catch(this.handleError);
    }
 
This is my post request by in Network tab I see this as Options method while on server I'm expecting a post request.
 
If I omit options from http.post then I get post request on server, but then I have error about unexpected content type.
 
postEmployeeForm(employee: Employee):Observable<any> {
        let body = JSON.stringify(employee);

        return this.http.post('http://localhost:3100/postemployee', body)
             .map(this.extractData)
             .catch(this.handleError);
    }
 
Is this expected behaviour or I'm doing something wrong with post. I found this code on official angular guide: server-communication How to handle this situation, do I need to change something on client side or should I handle that on server side?
 
EDIT: 
 
This is my server code:
 
var http = require('http');
var formidable = require("formidable");
var util = require('util');

var server = http.createServer(function(req, res) {
    res.setHeader('Access-Control-Allow-Origin','*');
    res.setHeader('Access-Control-Allow-Headers','Origin, X-Requested-With, Content-Type, Accept');

    if(req.method.toLowerCase() == 'post') {
        console.log("Get request!");
        processForm(req,res);
        return;
    }
});

function processForm(req,res) {

    var form = new formidable.IncomingForm();
    form.parse(req, function(err, fields) {

        res.writeHead(200, {
            'content-type': 'application/json'
        });

        res.end(util.inspect({
            fields: fields
        }));

        console.log('posted fields:\n');
        console.log(util.inspect({
            fields: fields
        }));
    });
}

var port = 3100;
server.listen(port,'localhost');
console.log("server listening on port " + port);

原文：https://stackoverflow.com/questions/41784402