Question

我正在尝试从Swift到Node.js服务器执行简单的http发布请求。当我运行以下代码时，主体似乎空着。我已经尝试了几种变体，但没有成功。

客户：SWIFT 5。

func api_post(){

        struct User: Codable {
            let username: String
            let password: String
        }

        let user = User(username: "ausername",password: "apassword")
        guard let uploadData = try? JSONEncoder().encode(user) else {
            return
        }



        let session = URLSession.shared
        let url = URL(string: "http://XXX.XXX.XXX.XXX:XXXX/post")
        var request = URLRequest(url: url!)
        request.httpMethod = "POST"
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.setValue("application/json", forHTTPHeaderField: "Accept")
        request.httpBody = uploadData




          let task = session.uploadTask(with: request, from: uploadData) { data, response, error in
            if let error = error {
                print ("ERROR: \(error)")
                return
            }
            guard let response = response as? HTTPURLResponse,
                (200...299).contains(response.statusCode) else {
                    print ("SERVER ERROR")
                    return
                }
            if let mimeType = response.mimeType,
                mimeType == "application/json",
                let data = data,
                let dataString = String(data: data, encoding: .utf8) {
                print ("RETURNED DATA: \(dataString)")
            }
        }
        task.resume()

}

结果：

POST!
{}

将CURL放入相同的url确实可以正常工作：

curl -d "username=ausername&password=apassword" -X POST http://XXX.XXX.XXX.XXX:XXX/post

结果：

FROM SERVER: POST RESPONSE [OK]

服务器：NodeJ和ExpressJ。

const express = require('express')
const app = express()
const bodyParser = require('body-parser')
const port = XXXX

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





app.post('/post', function (req, res) {
    console.log("POST!");
    var data = JSON.stringify(req.body,null,2);
    console.log(data)
    res.send ("FROM SERVER: POST RESPONSE [OK]");
});

app.listen(port, () => console.log(`Example app listening on port ${port}!`))

我已经从Swift的文档中复制并粘贴了很多内容，但仍然无法正常工作。我会怀疑我的服务器代码，但是curl确实可以工作。所以我不确定是什么问题。

谢谢！

Answer 1

最后想通了。问题出在服务器端。添加此行使其起作用。（bp是NPM bodyParser）

app.use(bp.json()); // support json encoded bodies

现在的结果符合预期：

POST!
{ username: 'ausername', password: 'a password' }

Swift http发布请求将空主体发送到服务器

1 个答案: